US20030053636A1 - Active noise filtering for voice communication systems - Google Patents
Active noise filtering for voice communication systems Download PDFInfo
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- US20030053636A1 US20030053636A1 US10/251,479 US25147902A US2003053636A1 US 20030053636 A1 US20030053636 A1 US 20030053636A1 US 25147902 A US25147902 A US 25147902A US 2003053636 A1 US2003053636 A1 US 2003053636A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/02—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
- G01S5/0284—Relative positioning
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
- G01S19/15—Aircraft landing systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
- G01S19/51—Relative positioning
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/0004—Transmission of traffic-related information to or from an aircraft
- G08G5/0008—Transmission of traffic-related information to or from an aircraft with other aircraft
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/0004—Transmission of traffic-related information to or from an aircraft
- G08G5/0013—Transmission of traffic-related information to or from an aircraft with a ground station
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/0017—Arrangements for implementing traffic-related aircraft activities, e.g. arrangements for generating, displaying, acquiring or managing traffic information
- G08G5/0021—Arrangements for implementing traffic-related aircraft activities, e.g. arrangements for generating, displaying, acquiring or managing traffic information located in the aircraft
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G5/00—Traffic control systems for aircraft, e.g. air-traffic control [ATC]
- G08G5/02—Automatic approach or landing aids, i.e. systems in which flight data of incoming planes are processed to provide landing data
- G08G5/025—Navigation or guidance aids
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
- H04B7/18508—Communications with or from aircraft, i.e. aeronautical mobile service with satellite system used as relay, i.e. aeronautical mobile satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40019—Details regarding a bus master
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40032—Details regarding a bus interface enhancer
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/407—Bus networks with decentralised control
- H04L12/413—Bus networks with decentralised control with random access, e.g. carrier-sense multiple-access with collision detection (CSMA-CD)
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- H—ELECTRICITY
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- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/40—Network security protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2217/00—Facilitation of operation; Human engineering
- H01H2217/022—Part of keyboard not operable
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/4028—Bus for use in transportation systems the transportation system being an aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/18—Network protocols supporting networked applications, e.g. including control of end-device applications over a network
Definitions
- the present invention relates generally to the field of speech signal processing and more particularly to a noise filtering system for use in a communications system.
- the typical microphone receives both voice signals and various “noise” signals.
- Noise signals can be generally characterized as undesired audio signals that tend to mask or distort the desired audio signals.
- noise may be introduced into the communication system by various sources including the ambient operational environment of the vehicle, sources external to the vehicle, and by the operational components of the communication system itself. Regardless of the source, noise is generally manifest as spurious audio signals in the voice communication system. Accordingly, users of the electronic communications system will hear both the desired voice signal and, in many intercom-type communication systems, various noise signals.
- noise tends to inhibit clear communications and may cause miscommunication of important information that could be detrimental to the desired operation of the vehicle.
- noise mixed with the speech signal tends to mask or distort the speech signal and, in certain situations, may render the voice signal entirely unintelligible.
- the continued exposure to noise in the communications system can cause unnecessary strain on the crew as they try to decipher the voice signal, thereby increasing operator fatigue.
- the present invention includes a processor configured to receive at least one operating parameter from an operating parameter input and, based on the operating parameter, configure at least one filter to filter a signal.
- FIG. 1 is a schematic block diagram of an apparatus for filtering vehicle noise sources in accordance with a preferred exemplary embodiment of the present invention
- FIG. 2 is a frequency diagram of a voice signal and various noise signals
- FIG. 3 is a flow diagram for filtering vehicle noise sources in accordance with a preferred exemplary embodiment of the present invention.
- a series of digital filters are “tuned” to the frequency of the ambient noises of the vehicle environment and can be adjusted as the ambient noise changes.
- a noise filtering apparatus 100 comprises a plurality of digital filters 120 , 130 and 140 , and a processor 150 .
- Processor 150 is configured to receive at least one operating parameter associated with the operation of the vehicle containing noise filtering apparatus 100 via operating parameter input 190 .
- An operating parameter may be any type of information relative to the operation of the vehicle containing noise-filtering apparatus 100 . This would include information about the operational environment as well as the various devices used in conjunction with the operation of the vehicle.
- Digital filters 120 , 130 and 140 are each configured to receive and process an audio signal 106 received from an audio source 105 .
- Each digital filter 120 , 130 and 140 is connected to processor 150 and is configured with a center frequency input 122 , 132 , and 142 respectively. Additionally, each digital filter 120 , 130 and 140 is configured with a filter bandwidth input 124 , 134 , or 144 respectively.
- Processor 150 can selectively adjust the center frequency of each of digital filters 120 , 130 , and 140 . Similarly, processor 150 can selectively adjust the bandwidth for each digital filter 120 , 130 , and 140 . This ability to adjust filters 120 , 130 , and 140 allows for the deployment of a relatively robust and flexible noise filtering apparatus 100 .
- an audio source 105 is coupled to noise filtering apparatus 100 and provides an audio signal 106 via an analog to digital (A/D) converter 110 .
- a digital to analog (D/A) converter 160 is coupled to an output signal connector 155 and is provided to convert the digital output signal from noise filtering apparatus 100 to an analog signal, suitable for use with loudspeaker 170 and/or transmitter 180 .
- Other types of output devices including other headsets or additional signal processing devices, may be employed in various other embodiments of the present invention as well.
- Processor 150 is most preferably configurable to adaptively respond to variations in the noise frequencies associated with the operation of the vehicle.
- operating parameter input 190 information relative to the operating environment of the vehicle can be used to adjust the center frequency for filters 120 , 130 and 140 . For example, as the revolutions-per-minute (RPM) of a helicopter rotor increase or decrease, the center frequencies of the noise signal associated with the rotor tend to shift.
- RPM revolutions-per-minute
- processor 150 can selectively adjust the center frequency of one or more of filters 120 , 130 and/or 140 to adaptively reconfigure filters 120 , 130 , and/or 140 , thereby more effectively filtering the helicopter rotor noise signal over a broader operating range.
- the bandwidth of each of filters 120 , 130 and 140 may be selectively adjusted by processor 150 , based on the operating environment as determined in conjunction with input received from operating parameter input 190 .
- the bandwidth of a given filter 120 , 130 or 140 may be narrowed while it may be desirable to broaden the bandwidth of another filter to reduce or eliminate the noise associated with a different noise source.
- the bandwidth of filters 120 , 130 and 140 will be kept as narrow as practical for a given noise source. This reconfiguration capability thereby allows noise-filtering apparatus 100 to be configured for a variety of noise frequencies without requiring a separate noise filter for each possible noise source or multiple filters for a single noise source with a changing center frequency.
- the audio signal is filtered prior to compression and/or transmission to any output device such as loudspeaker 170 and/or transmitter 180 .
- signal filtering is performed on the input side of noise filtering apparatus 100 .
- processor 150 While the most preferred embodiments of the present invention use a series of filters that are adaptively reconfigurable by processor 150 , other embodiments may rely on a series of non-reconfigurable filters specifically tuned to filter one or more pre-determined noise sources, at a pre-determined frequency and/or bandwidth. In those embodiments, processor 150 would simply select one or more filters from the population of available filters, depending on the noise source and the operational environment of the vehicle as determined in conjunction with input received from operating parameter input 190 .
- audio source 105 is depicted as the boom microphone of a standard aviator's headset, typical of the type used by a pilot or crewmember in an aircraft.
- this depiction is merely representative in nature and other audio sources may be configured for use with the present invention as well.
- audio signal 106 may be a digital signal, obviating the need for A/D converter 110 .
- the signal provided at output signal connector 155 may not need to be converted to an analog signal in certain applications.
- the conversion of an input or an output signal may be accomplished by many means and all such conversions, if required, are considered to be within the scope of the present invention.
- a frequency diagram 200 for a voice signal 250 combined with a plurality of noise frequencies (f 1 , f 2 , and f 3 ) with each frequency having a center frequency 220 , 230 or 240 .
- Frequency diagram 200 illustrates the interaction of the noise signals with voice signal 250 and each noise frequency shown in FIG. 2 can be attributed to a specific noise source associated with the operational environment of a vehicle such as an airplane or helicopter.
- Voice signal 250 can contain noise attributable to the operation of the vehicle and, as shown in FIG. 2, the noise frequencies will generally be identifiable within multiple frequency bands.
- each typical noise frequency has a relatively narrow bandwidth. Accordingly, these frequencies can be identified/characterized and a filter can be appropriately configured with a suitable bandwidth to mask the noise signal at that specific frequency.
- a method 300 for implementing a noise filtering apparatus in accordance with a preferred exemplary embodiment of the present invention is shown.
- a frequency spectrum analysis of a given vehicle is conducted (step 310 ) to identify various noise sources and related noise frequencies associated with the operating environment of the vehicle. This analysis will also characterize the noise frequencies and the associated bandwidths of these frequencies for the various operating modes of the vehicle (step 320 ).
- the noise sources may include things such as electrical devices, machinery, mechanical sub-systems and the like.
- appropriate filters for the identified frequencies will be selected (step 330 ). These filters will be specifically configurable for the noise frequencies identified in the spectrum analysis and characterization steps of method 300 . After the filters have been selected, the processor that will control the filters will be configured with information about each of the filters, including identifying an initial center frequency input and a filter bandwidth input for each of the filters. This will allow the processor to control the bandwidth of each filter and selectively activate or deactivate the appropriate filter or filters, depending on the specific noise frequency as determined by the operating parameter or parameters.
- the processor will receive at least one operating parameter (step 350 ) and will adjust the center frequency of at least one of the filters to reduce or eliminate the noise signal associated with that operating parameter (step 360 ) or adjust the bandwidth (step 370 ) of one or more filters, if necessary.
- Steps 360 and 370 are optional steps that will be used as necessary, depending on the type of noise signal being filtered and the type of filtering being performed.
- the center frequency adjustment will allow various noises to be filtered based on changes in the operating environment and changes in the bandwidth will allow for the specific filtering of isolated noises, as desired.
- steps 350 , 360 and/or 370 may be repeated for any number of operating parameters and/or for any number of changes in any given operating parameter or parameters. In this manner, it is possible to configure the noise filtering apparatus for a multitude of different noise signals generated by a number of different operating environments.
Abstract
The present invention includes a processor configured to receive at least one operating parameter from an operating parameter input and, based on the operating parameter, configure at least one filter to filter a signal.
Description
- This application claims the benefit of U.S. Provisional Patent Application No.60/324,035, filed Sep. 20, 2001.
- 1. Technical Field
- The present invention relates generally to the field of speech signal processing and more particularly to a noise filtering system for use in a communications system.
- 2. Background Art
- In certain types of vehicles, such as submarines and aircraft, clear communications between the members of the crew is considered desirable for proper operation of the vehicle. In many onboard voice communication systems, the communications between various crewmembers is typically accomplished through the use of an onboard electronic intercom system. The typical onboard electronic intercom system will generally include headphones and microphones and will allow for communications between the primary vehicle operators as well as crewmembers located in other parts of the vehicle.
- In operation, the typical microphone receives both voice signals and various “noise” signals. Noise signals can be generally characterized as undesired audio signals that tend to mask or distort the desired audio signals. In general, noise may be introduced into the communication system by various sources including the ambient operational environment of the vehicle, sources external to the vehicle, and by the operational components of the communication system itself. Regardless of the source, noise is generally manifest as spurious audio signals in the voice communication system. Accordingly, users of the electronic communications system will hear both the desired voice signal and, in many intercom-type communication systems, various noise signals.
- As can be appreciated, the introduction of noise into the communications system is considered undesirable. Noise tends to inhibit clear communications and may cause miscommunication of important information that could be detrimental to the desired operation of the vehicle. Additionally, noise mixed with the speech signal tends to mask or distort the speech signal and, in certain situations, may render the voice signal entirely unintelligible. Finally, the continued exposure to noise in the communications system can cause unnecessary strain on the crew as they try to decipher the voice signal, thereby increasing operator fatigue.
- In an effort to mitigate the undesirable effects of noise in the communications system, some conventional intercom communication systems have adopted a compression scheme in order to reduce the noise introduced by the communications system itself. In a typical compressed signal system, mixed noise and voice signals are compressed at the transmitting end and then expanded at the receiving end of the system. These systems are typically implemented to reduce only the noise introduced in the transmission channel of the communication system itself, between the microphone and the headphone. Accordingly, any ambient acoustic noise picked up by the microphone tends to remain unchanged in these systems.
- Other types of communication systems attempt to cancel noise by measuring the ambient noise in the vicinity of the microphone. Then, various filters may be employed to subtract the “measured” noise from the combined voice and noise signal. While somewhat effective, these systems generally require two microphones, the first microphone being used to pick up the combined voice and noise signal while the second microphone attempts to pick up only the ambient noise. The requirement for a second microphone adds cost and complexity to the intercom system and may not substantially enhance performance because the ambient noise in the vicinity of the second microphone may not accurately represent the ambient noise in the vicinity of the first microphone.
- In view of the foregoing, it should be appreciated that it would be desirable to provide methods and apparatus for minimizing the undesirable noise in a vehicle's communication system without substantially increasing the cost and complexity of the communication system. Furthermore, additional desirable features will become apparent to one skilled in the art from the foregoing background of the invention and following detailed description of a preferred exemplary embodiment and appended claims.
- The present invention includes a processor configured to receive at least one operating parameter from an operating parameter input and, based on the operating parameter, configure at least one filter to filter a signal.
- The preferred exemplary embodiment of the present invention will hereinafter be described in conjunction with the appended drawings, where like designations denote like elements, and:
- FIG. 1 is a schematic block diagram of an apparatus for filtering vehicle noise sources in accordance with a preferred exemplary embodiment of the present invention;
- FIG. 2 is a frequency diagram of a voice signal and various noise signals; and
- FIG. 3 is a flow diagram for filtering vehicle noise sources in accordance with a preferred exemplary embodiment of the present invention.
- In the most preferred embodiments of the present invention, a series of digital filters are “tuned” to the frequency of the ambient noises of the vehicle environment and can be adjusted as the ambient noise changes.
- Referring now to FIG. 1, a
noise filtering apparatus 100 comprises a plurality ofdigital filters processor 150.Processor 150 is configured to receive at least one operating parameter associated with the operation of the vehicle containingnoise filtering apparatus 100 viaoperating parameter input 190. An operating parameter may be any type of information relative to the operation of the vehicle containing noise-filteringapparatus 100. This would include information about the operational environment as well as the various devices used in conjunction with the operation of the vehicle. -
Digital filters audio signal 106 received from anaudio source 105. Eachdigital filter processor 150 and is configured with acenter frequency input digital filter filter bandwidth input Processor 150 can selectively adjust the center frequency of each ofdigital filters processor 150 can selectively adjust the bandwidth for eachdigital filter filters noise filtering apparatus 100. - Additionally, as shown in FIG. 1, an
audio source 105 is coupled to noise filteringapparatus 100 and provides anaudio signal 106 via an analog to digital (A/D)converter 110. Similarly, a digital to analog (D/A)converter 160 is coupled to anoutput signal connector 155 and is provided to convert the digital output signal fromnoise filtering apparatus 100 to an analog signal, suitable for use withloudspeaker 170 and/ortransmitter 180. Other types of output devices, including other headsets or additional signal processing devices, may be employed in various other embodiments of the present invention as well. -
Processor 150 is most preferably configurable to adaptively respond to variations in the noise frequencies associated with the operation of the vehicle. By usingoperating parameter input 190, information relative to the operating environment of the vehicle can be used to adjust the center frequency forfilters processor 150 viaoperating parameter input 190, thenprocessor 150 can selectively adjust the center frequency of one or more offilters filters - Additionally, the bandwidth of each of
filters processor 150, based on the operating environment as determined in conjunction with input received fromoperating parameter input 190. For certain noise sources, the bandwidth of a givenfilter filters apparatus 100 to be configured for a variety of noise frequencies without requiring a separate noise filter for each possible noise source or multiple filters for a single noise source with a changing center frequency. In the most preferred embodiments of the present invention, the audio signal is filtered prior to compression and/or transmission to any output device such asloudspeaker 170 and/ortransmitter 180. This means that in the most preferred embodiments of the present invention, signal filtering is performed on the input side ofnoise filtering apparatus 100. - While the most preferred embodiments of the present invention use a series of filters that are adaptively reconfigurable by
processor 150, other embodiments may rely on a series of non-reconfigurable filters specifically tuned to filter one or more pre-determined noise sources, at a pre-determined frequency and/or bandwidth. In those embodiments,processor 150 would simply select one or more filters from the population of available filters, depending on the noise source and the operational environment of the vehicle as determined in conjunction with input received fromoperating parameter input 190. - In this particular exemplary embodiment,
audio source 105 is depicted as the boom microphone of a standard aviator's headset, typical of the type used by a pilot or crewmember in an aircraft. However, it should be noted that this depiction is merely representative in nature and other audio sources may be configured for use with the present invention as well. Additionally, in certain applications, it is anticipated thataudio signal 106 may be a digital signal, obviating the need for A/D converter 110. Similarly, the signal provided atoutput signal connector 155 may not need to be converted to an analog signal in certain applications. Finally, those skilled in the art will recognize that the conversion of an input or an output signal may be accomplished by many means and all such conversions, if required, are considered to be within the scope of the present invention. - It should also be noted that although the number of digital filters depicted in FIG. 1 is three, the exact number of digital filters used in
noise filtering apparatus 100 is largely a design consideration and will be determined by the specific application, based on parameters such as the number and type of noise sources. Similarly, although a singleoperating parameter input 190 is shown, those skilled in the art will recognize that, if necessary or desired for a specific application, additional operating parameter inputs may be included innoise filtering apparatus 100 without departing from the overall spirit and scope of the present invention. - Referring now to FIG. 2, a frequency diagram200 for a
voice signal 250 combined with a plurality of noise frequencies (f1, f2, and f3) with each frequency having a center frequency 220, 230 or 240. Frequency diagram 200 illustrates the interaction of the noise signals withvoice signal 250 and each noise frequency shown in FIG. 2 can be attributed to a specific noise source associated with the operational environment of a vehicle such as an airplane or helicopter.Voice signal 250 can contain noise attributable to the operation of the vehicle and, as shown in FIG. 2, the noise frequencies will generally be identifiable within multiple frequency bands. As shown in FIG. 2, each typical noise frequency has a relatively narrow bandwidth. Accordingly, these frequencies can be identified/characterized and a filter can be appropriately configured with a suitable bandwidth to mask the noise signal at that specific frequency. - Referring now to FIG. 3, a
method 300 for implementing a noise filtering apparatus in accordance with a preferred exemplary embodiment of the present invention is shown. As shown in FIG. 3, a frequency spectrum analysis of a given vehicle is conducted (step 310) to identify various noise sources and related noise frequencies associated with the operating environment of the vehicle. This analysis will also characterize the noise frequencies and the associated bandwidths of these frequencies for the various operating modes of the vehicle (step 320). The noise sources may include things such as electrical devices, machinery, mechanical sub-systems and the like. - Next, appropriate filters for the identified frequencies will be selected (step330). These filters will be specifically configurable for the noise frequencies identified in the spectrum analysis and characterization steps of
method 300. After the filters have been selected, the processor that will control the filters will be configured with information about each of the filters, including identifying an initial center frequency input and a filter bandwidth input for each of the filters. This will allow the processor to control the bandwidth of each filter and selectively activate or deactivate the appropriate filter or filters, depending on the specific noise frequency as determined by the operating parameter or parameters. - Finally, in typical operation, the processor will receive at least one operating parameter (step350) and will adjust the center frequency of at least one of the filters to reduce or eliminate the noise signal associated with that operating parameter (step 360) or adjust the bandwidth (step 370) of one or more filters, if necessary.
Steps steps - From the foregoing description, it should be appreciated that methods and apparatus are provided for a vehicle noise filtering system. While certain preferred exemplary embodiments have been presented in the foregoing detailed description of the preferred exemplary embodiments, it should be appreciated that a vast number of variations in the embodiments exist. For example, although the various preferred exemplary embodiments of the present invention have been described in the context of a communications system for an aircraft, the apparatus and methods of the present invention are equally applicable to communication systems in other vehicles such as submarines, spacecraft, and the like.
- It should also be appreciated that the preferred exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description provides those skilled in the art with a convenient road map for implementing the preferred exemplary embodiments of the invention. It should also be understood that various changes may be made in the function and arrangement of elements described in the preferred exemplary embodiments without departing from the spirit and scope of the invention as set forth in the appended claims.
Claims (21)
1. A noise filtering apparatus comprising:
a processor, said processor being configured to receive at least one operating parameter from an operating parameter input; and
at least one filter coupled to said processor, said at least one filter being configurable by said processor based on said at least one operating parameter.
2. The noise filtering apparatus of claim 1 further comprising an audio source coupled to said noise filtering apparatus, said audio source being configured to transmit an audio signal to said noise filtering apparatus.
3. The noise filtering apparatus of claim 2 wherein said audio source comprises a microphone.
4. The noise filtering apparatus of claim 1 further comprising an output device coupled to said noise filtering apparatus, said output device being configured to transmit a filtered signal received from said noise filtering apparatus.
5. The noise filtering apparatus of claim 2 wherein said output device comprises a loudspeaker.
6. The noise filtering apparatus of claim 2 wherein said output device comprises a transmitter.
7. The noise filtering apparatus of claim 1 wherein said at least one filter coupled to said processor comprises a plurality of digital filters coupled to said processor, wherein each of said plurality of digital filters is configurable by said processor based on said at least one operating parameter.
8. The noise filtering apparatus of claim 2 further comprising an analog-to-digital converter coupled between said audio source and said noise filtering apparatus, said analog-to-digital converter being configured to convert an analog signal to a digital signal.
9. The noise filtering apparatus of claim 4 further comprising a digital-to-analog converter coupled between said noise filtering apparatus and said output device, said digital-to-analog converter being configured to convert a digital signal to an analog signal.
10. The noise filtering apparatus of claim 1 wherein said at least one operating parameter comprises a plurality of operating parameters.
11. A noise filtering apparatus comprising:
a processor, said processor being configured to receive at least one operating parameter from an operating parameter input;
a plurality of digital filters coupled to said processor, each of said plurality of filters being configurable by said processor based on said at least one operating parameter;
an analog-to-digital converter coupled to said noise filtering apparatus, said analog-to-digital converter being configured to convert an analog signal to a digital signal;
an audio source coupled to said analog-to-digital converter, said audio source being configured to transmit an analog signal to said noise filtering apparatus via said analog-to-digital converter;
a digital-to-analog converter coupled to said noise filtering apparatus, said digital-to-analog converter being configured to convert a digital signal to an analog signal; and
an output device coupled to said digital-to-analog converter, said output device being configured to transmit a filtered signal received from said noise filtering apparatus via said digital-to-analog converter.
12. The noise filtering apparatus of claim 11 wherein said output device comprises a loudspeaker.
13. The noise filtering apparatus of claim 11 wherein said audio source comprises a microphone.
14. A noise filtering method comprising the steps of:
analyzing a frequency spectrum to identify at least one noise source;
selecting at least one filter based on a frequency associated with said at least one noise source;
configuring a processor to adaptively configure said at least one filter;
supplying said processor with at least one operating parameter; and
configuring said at least one filter based on said at least one operating parameter.
15. The noise filtering method of claim 14 wherein said step of selecting at least once filter comprises the step of selecting a plurality of filters.
16. The noise filtering method of claim 15 wherein said step of configuring at least one filter based on said at least one operating parameter comprises the step of configuring a plurality of filters based on said at least one operating parameter.
17. The noise filtering method of claim 14 further comprising the step of using said at least one filter to filter an audio signal.
18. The noise filtering method of claim 17 further comprising the step of transmitting said audio signal to an output device after filtering said audio signal.
19. The noise filtering method of claim 18 wherein said output device comprises a loudspeaker.
20. The noise filtering method of claim 14 further comprising the step of transmitting an audio signal from an audio source to said at least one filter.
21. The noise filtering method of claim 20 wherein said audio source is a microphone.
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20040111258A1 (en) * | 2002-12-10 | 2004-06-10 | Zangi Kambiz C. | Method and apparatus for noise reduction |
US20100272282A1 (en) * | 2009-04-28 | 2010-10-28 | Carreras Ricardo F | ANR Settings Triple-Buffering |
US20100272276A1 (en) * | 2009-04-28 | 2010-10-28 | Carreras Ricardo F | ANR Signal Processing Topology |
US20100272278A1 (en) * | 2009-04-28 | 2010-10-28 | Marcel Joho | Dynamically Configurable ANR Filter Block Topology |
US20100272281A1 (en) * | 2009-04-28 | 2010-10-28 | Carreras Ricardo F | ANR Analysis Side-Chain Data Support |
US20100272283A1 (en) * | 2009-04-28 | 2010-10-28 | Carreras Ricardo F | Digital high frequency phase compensation |
US20100274564A1 (en) * | 2009-04-28 | 2010-10-28 | Pericles Nicholas Bakalos | Coordinated anr reference sound compression |
US20100272277A1 (en) * | 2009-04-28 | 2010-10-28 | Marcel Joho | Dynamically Configurable ANR Signal Processing Topology |
US20110188665A1 (en) * | 2009-04-28 | 2011-08-04 | Burge Benjamin D | Convertible filter |
US8472637B2 (en) | 2010-03-30 | 2013-06-25 | Bose Corporation | Variable ANR transform compression |
US8532310B2 (en) | 2010-03-30 | 2013-09-10 | Bose Corporation | Frequency-dependent ANR reference sound compression |
US8611553B2 (en) | 2010-03-30 | 2013-12-17 | Bose Corporation | ANR instability detection |
CN104717588A (en) * | 2015-02-09 | 2015-06-17 | 深圳航天金悦通科技有限公司 | Low-power-consumption in-ear type active noise reduction earphone and noise reduction method |
US10157627B1 (en) * | 2017-06-02 | 2018-12-18 | Bose Corporation | Dynamic spectral filtering |
EP4254399A1 (en) * | 2022-03-28 | 2023-10-04 | Jaguar Land Rover Limited | Audio signal processing method and apparatus |
Families Citing this family (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7006850B1 (en) * | 2002-03-15 | 2006-02-28 | Garmin International, Inc. | Systems, apparatus, and methods for cockpit interface system with digital audio radio management unit |
US7215766B2 (en) * | 2002-07-22 | 2007-05-08 | Lightspeed Aviation, Inc. | Headset with auxiliary input jack(s) for cell phone and/or other devices |
US6822624B2 (en) * | 2002-09-10 | 2004-11-23 | Universal Avionics Systems Corporation | Display generation system |
US20040167685A1 (en) * | 2003-02-24 | 2004-08-26 | Ryan Dean E. | Runway overrun monitor and method for monitoring runway overruns |
WO2005086933A2 (en) * | 2004-03-09 | 2005-09-22 | Procon, Inc. | Combination service request and satellite radio system |
FR2877518B1 (en) * | 2004-11-02 | 2007-02-09 | Airbus France Sas | RADIO FREQUENCY COMMUNICATION SYSTEM FOR AIRCRAFT |
JP4581738B2 (en) * | 2005-02-25 | 2010-11-17 | 日本電気株式会社 | Air-to-air system |
US20060281425A1 (en) * | 2005-06-08 | 2006-12-14 | Jungerman Roger L | Feed forward spur reduction in mixed signal system |
WO2007017881A2 (en) * | 2005-08-10 | 2007-02-15 | Ari Maor | Portable dialer device and method |
FR2897593B1 (en) * | 2006-02-17 | 2012-09-14 | Airbus France | METHOD AND SYSTEM FOR PREDICTING THE POSSIBILITY OF COMPLETELY STOPPING AN AIRCRAFT ON A LANDING TRAIL. |
CN101102338B (en) * | 2006-07-07 | 2011-07-27 | 鸿富锦精密工业(深圳)有限公司 | Mobile phone with earphone function |
US20080215198A1 (en) * | 2006-09-22 | 2008-09-04 | Richards Robert E | Method and apparatus for providing takeoff runway information and predicting end of runway overrun |
FR2915644B1 (en) * | 2007-04-26 | 2011-05-06 | Airbus France | METHOD FOR DETERMINING AN IDENTIFICATION CORRESPONDING TO A FREQUENCY SET ON A COCKPIT DISPLAY AND SYSTEM FOR IMPLEMENTING THE SAME |
DE102009008550A1 (en) * | 2009-02-12 | 2010-08-19 | Sennheiser Electronic Gmbh & Co. Kg | Communication and/or entertainment system e.g. media player, for use in airplane, has processing unit executing active noise control based on background noise and adapting control to earphone or headset through selection of used filters |
DE102010019394B4 (en) | 2010-05-04 | 2018-09-27 | Becker Avionics Gmbh | Communication system for an aircraft |
US9159241B1 (en) * | 2011-04-15 | 2015-10-13 | The Boeing Company | Methods, systems, and apparatus for synthetic instrument landing system (SILS) |
FR2983175A1 (en) * | 2011-11-30 | 2013-05-31 | Airbus Operations Sas | WIRING OF A PANEL OF AIRCRAFT BREAKERS |
ES2595578T3 (en) * | 2012-10-22 | 2017-01-02 | Airbus Defence And Space Sa | An digital audio system of an aircraft |
DE102013001385A1 (en) * | 2013-01-26 | 2014-07-31 | Audi Ag | Motor vehicle and microphone for a microphone assembly in the motor vehicle |
US9746562B2 (en) | 2014-06-30 | 2017-08-29 | The Boeing Company | Portable ground based augmentation system |
FR3033678B1 (en) * | 2015-03-10 | 2017-02-24 | Airbus Operations Sas | AUDIO SYSTEM FOR AIRCRAFT |
FR3044152A1 (en) * | 2015-11-19 | 2017-05-26 | Direction Des Services De La Navigation Aerienne | SIGNAL RECEPTION STATION FOR AN ADS-B MONITORING SYSTEM |
US10089837B2 (en) | 2016-05-10 | 2018-10-02 | Ge Aviation Systems, Llc | System and method for audibly communicating a status of a connected device or system |
RU2639143C1 (en) * | 2016-12-01 | 2017-12-20 | Николай Евгеньевич Староверов | System of radio exchange (versions) |
CN109996150A (en) * | 2018-01-02 | 2019-07-09 | 上海航空电器有限公司 | A kind of ground proximity warning system multichannel outputting alarm sound circuit |
US11373635B2 (en) * | 2018-01-10 | 2022-06-28 | Sony Corporation | Information processing apparatus that fades system utterance in response to interruption |
CN111554129B (en) * | 2020-05-15 | 2023-03-24 | 航迅信息技术有限公司 | Unmanned aerial vehicle rail system based on indoor location |
RU2746218C1 (en) * | 2020-08-24 | 2021-04-09 | Федеральное государственное казенное военное образовательное учреждение высшего профессионального образования "Михайловская военная артиллерийская академия" Министерства Обороны Российской Федерации | Radionavigation multi-position differential distance system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4460962A (en) * | 1981-07-30 | 1984-07-17 | Wabco Fahrzeugbremsen Gmbh | Anti-skid brake control system |
US5293576A (en) * | 1991-11-21 | 1994-03-08 | Motorola, Inc. | Command authentication process |
US5293578A (en) * | 1989-07-19 | 1994-03-08 | Fujitso Ten Limited | Noise reducing device |
US5652799A (en) * | 1994-06-06 | 1997-07-29 | Noise Cancellation Technologies, Inc. | Noise reducing system |
US5841876A (en) * | 1993-04-07 | 1998-11-24 | Noise Cancellation Technologies, Inc. | Hybrid analog/digital vibration control system |
US6363156B1 (en) * | 1998-11-18 | 2002-03-26 | Lear Automotive Dearborn, Inc. | Integrated communication system for a vehicle |
US20020097884A1 (en) * | 2001-01-25 | 2002-07-25 | Cairns Douglas A. | Variable noise reduction algorithm based on vehicle conditions |
US6522753B1 (en) * | 1998-10-07 | 2003-02-18 | Fujitsu Limited | Active noise control method and receiver device |
Family Cites Families (53)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3201774A (en) * | 1962-12-26 | 1965-08-17 | Tateisi Denki Kabushikikaisha | Electrical sensing apparatus |
US3665303A (en) * | 1969-12-04 | 1972-05-23 | Leo O Richards | System for automatically and manually testing lines for determining if information can be accurately transmitted thereon |
US3999015A (en) * | 1975-05-27 | 1976-12-21 | Genie Electronics Co., Inc. | Aircraft multi-communications system |
US4081624A (en) * | 1976-09-21 | 1978-03-28 | Nippon Tsu Shin Kogyo K.K. | Key telephone intercom line system |
FR2461261A1 (en) * | 1979-07-11 | 1981-01-30 | Cit Alcatel | DEVICE FOR MONITORING THE CORRECT OPERATION OF ELECTRONIC EQUIPMENT |
FR2526976B1 (en) * | 1982-05-17 | 1987-03-20 | Serres Bernard | SYSTEM FOR MANAGING A PANEL OF OBJECTS SUCH AS KEYS |
DE3230391A1 (en) * | 1982-08-14 | 1984-02-16 | Philips Kommunikations Industrie AG, 8500 Nürnberg | Method for improving speech signals affected by interference |
EP0129894A3 (en) | 1983-06-28 | 1988-01-20 | Honeywell Inc. | Machine control panel |
US4941187A (en) * | 1984-02-03 | 1990-07-10 | Slater Robert W | Intercom apparatus for integrating disparate audio sources for use in light aircraft or similar high noise environments |
US4687888A (en) * | 1985-05-29 | 1987-08-18 | E. I. Dupont De Nemours And Co. | Electrical connector with switch |
US4866450A (en) * | 1986-05-15 | 1989-09-12 | Sundstrand Data Control, Inc. | Advanced instrument landing system |
US5408515A (en) * | 1988-04-29 | 1995-04-18 | Mobile Telecommunication Technologies | Ground-to-air telephone calling system and related method for directing a call to a particular passenger |
US4903298A (en) * | 1988-07-27 | 1990-02-20 | Sunstrand Data Control, Inc. | System for providing encryption and decryption of voice and data transmissions to and from an aircraft |
US4979154A (en) * | 1989-01-10 | 1990-12-18 | Lester Brodeur | Landing aid for aircraft |
US5148112A (en) * | 1991-06-28 | 1992-09-15 | Digital Equipment Corporation | Efficient arbiter |
JP3315131B2 (en) * | 1991-08-27 | 2002-08-19 | パイオニア株式会社 | Automotive electronics |
US5657009A (en) * | 1991-10-31 | 1997-08-12 | Gordon; Andrew A. | System for detecting and viewing aircraft-hazardous incidents that may be encountered by aircraft landing or taking-off |
US5397924A (en) * | 1991-12-09 | 1995-03-14 | Eaton Corporation | Truck tractor and trailer electrical communication system |
US6108539A (en) * | 1992-03-06 | 2000-08-22 | Aircell, Incorporated | Non-terrestrial cellular mobile telecommunication station |
US5361212A (en) * | 1992-11-02 | 1994-11-01 | Honeywell Inc. | Differential GPS landing assistance system |
US5334987A (en) * | 1993-04-01 | 1994-08-02 | Spectra-Physics Laserplane, Inc. | Agricultural aircraft control system using the global positioning system |
US5596578A (en) * | 1993-10-04 | 1997-01-21 | Fostex Corporation Of America | Time division multiplexing data transfer system for digital audio data distribution |
FI118984B (en) * | 1994-04-20 | 2008-05-30 | Sony Corp | Communication terminal device and its control method |
JP3484801B2 (en) * | 1995-02-17 | 2004-01-06 | ソニー株式会社 | Method and apparatus for reducing noise of audio signal |
JPH08242475A (en) * | 1995-03-06 | 1996-09-17 | Toshiba Corp | Method for call reception and call transmission for private branch of exchange |
WO1997009798A1 (en) * | 1995-09-07 | 1997-03-13 | Sherwood Robert D | Airplane pilot communication aid |
US5702070A (en) * | 1995-09-20 | 1997-12-30 | E-Systems, Inc. | Apparatus and method using relative GPS positioning for aircraft precision approach and landing |
US5903227A (en) * | 1996-04-30 | 1999-05-11 | Scheuer; Mark S. | Remote channel swap for aviation communications |
US5822417A (en) * | 1996-05-10 | 1998-10-13 | General Signal Corporation | Phone control center for a life safety network |
FR2751827B1 (en) * | 1996-07-26 | 1998-10-23 | Sextant Avionique | AUDIOPHONIC COMMUNICATION SYSTEM |
US5786773A (en) * | 1996-10-02 | 1998-07-28 | The Boeing Company | Local-area augmentation system for satellite navigation precision-approach system |
US5939997A (en) * | 1996-10-31 | 1999-08-17 | Sony Corporation | Detection method of bus termination |
US5808661A (en) * | 1997-01-08 | 1998-09-15 | Rockwell International Corporation | Aircraft audio/video intercom system |
US5917920A (en) * | 1997-05-29 | 1999-06-29 | Humphries; Alan | Safety vehicle communication system |
US6650897B2 (en) * | 1997-12-11 | 2003-11-18 | At&T Wireless Services, Inc. | Aircraft cockpit telephony |
US6151354A (en) * | 1997-12-19 | 2000-11-21 | Rockwell Science Center | Multi-mode, multi-band, multi-user radio system architecture |
US6119055A (en) * | 1998-01-23 | 2000-09-12 | Mcdonnell Douglas Corporation | Real time imaging system and method for use in aiding a landing operation of an aircraft in obscured weather conditions |
US6385513B1 (en) * | 1998-12-08 | 2002-05-07 | Honeywell International, Inc. | Satellite emergency voice/data downlink |
US6295284B1 (en) * | 1998-12-23 | 2001-09-25 | Qualcomm. Inc. | Method and apparatus for providing fair access in a group communication system |
EP1151359B1 (en) * | 1999-02-01 | 2006-08-30 | Honeywell International Inc. | Method, apparatus and computer program products for determining a corrected distance between an aircraft and a selected runway |
US6360093B1 (en) * | 1999-02-05 | 2002-03-19 | Qualcomm, Incorporated | Wireless push-to-talk internet broadcast |
US6760413B2 (en) * | 1999-02-16 | 2004-07-06 | Agere Systems Inc. | Display of call related information regarding a called party |
DE19914805C2 (en) * | 1999-03-31 | 2001-04-26 | Becker Gmbh | Sound system for a motor vehicle and method for initializing one |
US6239745B1 (en) * | 1999-07-30 | 2001-05-29 | Rockwell Collins, Inc. | Satellite landing system having instrument landing system look alike guidance |
US6470224B1 (en) * | 1999-10-01 | 2002-10-22 | Hamilton Sundstrand Corporation | Configurable aircraft power system |
JP3970512B2 (en) | 1999-12-14 | 2007-09-05 | アルプス電気株式会社 | In-vehicle device controller |
US6766292B1 (en) * | 2000-03-28 | 2004-07-20 | Tellabs Operations, Inc. | Relative noise ratio weighting techniques for adaptive noise cancellation |
US8803971B2 (en) * | 2000-04-07 | 2014-08-12 | Livetv, Llc | Aircraft system providing passenger entertainment and surveillance features, and associated methods |
US6622030B1 (en) * | 2000-06-29 | 2003-09-16 | Ericsson Inc. | Echo suppression using adaptive gain based on residual echo energy |
US7398069B2 (en) * | 2000-07-10 | 2008-07-08 | Honeywell International Inc. | Navigation morse decode display |
US20020150262A1 (en) * | 2001-03-29 | 2002-10-17 | Carter Jerome D. | Method and apparatus for communicating to vehicle occupants |
US6778073B2 (en) * | 2001-06-26 | 2004-08-17 | Medius, Inc. | Method and apparatus for managing audio devices |
US6899184B2 (en) * | 2001-07-30 | 2005-05-31 | The Boeing Company | Fire suppression system and method for an interior area of an aircraft lavatory waste container fire protection |
-
2002
- 2002-09-19 DE DE60204333T patent/DE60204333T2/en not_active Expired - Lifetime
- 2002-09-19 EP EP02770539A patent/EP1428036A2/en not_active Withdrawn
- 2002-09-19 EP EP02761782A patent/EP1428354A2/en not_active Withdrawn
- 2002-09-19 EP EP02761757A patent/EP1427995A2/en not_active Withdrawn
- 2002-09-19 WO PCT/US2002/029909 patent/WO2003025508A2/en not_active Application Discontinuation
- 2002-09-19 AU AU2002326997A patent/AU2002326997A1/en not_active Abandoned
- 2002-09-19 DE DE60223156T patent/DE60223156T2/en not_active Expired - Lifetime
- 2002-09-19 EP EP02761756A patent/EP1428207B1/en not_active Expired - Fee Related
- 2002-09-19 US US10/251,555 patent/US6950036B2/en not_active Expired - Fee Related
- 2002-09-19 US US10/251,456 patent/US20030055519A1/en not_active Abandoned
- 2002-09-19 EP EP02763674A patent/EP1428330B1/en not_active Expired - Lifetime
- 2002-09-19 AU AU2002327021A patent/AU2002327021A1/en not_active Abandoned
- 2002-09-19 DE DE60238127T patent/DE60238127D1/en not_active Expired - Lifetime
- 2002-09-19 US US10/251,454 patent/US6801158B2/en not_active Expired - Fee Related
- 2002-09-19 WO PCT/US2002/030039 patent/WO2003025962A1/en not_active Application Discontinuation
- 2002-09-19 WO PCT/US2002/029926 patent/WO2003025617A2/en not_active Application Discontinuation
- 2002-09-19 WO PCT/US2002/029908 patent/WO2003025905A1/en active IP Right Grant
- 2002-09-19 US US10/251,235 patent/US7245909B2/en not_active Expired - Lifetime
- 2002-09-19 US US10/251,479 patent/US20030053636A1/en not_active Abandoned
- 2002-09-19 WO PCT/US2002/030040 patent/WO2003026174A2/en not_active Application Discontinuation
- 2002-09-19 US US10/251,431 patent/US6659392B2/en not_active Expired - Lifetime
- 2002-09-19 AU AU2002335775A patent/AU2002335775A1/en not_active Abandoned
- 2002-09-19 WO PCT/US2002/029910 patent/WO2003026162A2/en not_active Application Discontinuation
- 2002-09-19 EP EP02761781A patent/EP1428234B1/en not_active Expired - Fee Related
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4460962A (en) * | 1981-07-30 | 1984-07-17 | Wabco Fahrzeugbremsen Gmbh | Anti-skid brake control system |
US5293578A (en) * | 1989-07-19 | 1994-03-08 | Fujitso Ten Limited | Noise reducing device |
US5293576A (en) * | 1991-11-21 | 1994-03-08 | Motorola, Inc. | Command authentication process |
US5841876A (en) * | 1993-04-07 | 1998-11-24 | Noise Cancellation Technologies, Inc. | Hybrid analog/digital vibration control system |
US5652799A (en) * | 1994-06-06 | 1997-07-29 | Noise Cancellation Technologies, Inc. | Noise reducing system |
US6522753B1 (en) * | 1998-10-07 | 2003-02-18 | Fujitsu Limited | Active noise control method and receiver device |
US6363156B1 (en) * | 1998-11-18 | 2002-03-26 | Lear Automotive Dearborn, Inc. | Integrated communication system for a vehicle |
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