Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R3/00—Circuits for transducers
  • H04R3/02—Circuits for transducers for preventing acoustic reaction, i.e. acoustic oscillatory feedback
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
  • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
  • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
  • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
  • G10K11/17819—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the reference signals, e.g. to prevent howling
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
  • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
  • G10K11/1785—Methods, e.g. algorithms; Devices
  • G10K11/17853—Methods, e.g. algorithms; Devices of the filter
  • G10K11/17854—Methods, e.g. algorithms; Devices of the filter the filter being an adaptive filter
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
  • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
  • G10K11/1787—General system configurations
  • G10K11/17879—General system configurations using both a reference signal and an error signal
  • G10K11/17881—General system configurations using both a reference signal and an error signal the reference signal being an acoustic signal, e.g. recorded with a microphone
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/08—Mouthpieces; Microphones; Attachments therefor
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
  • H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R1/00—Details of transducers, loudspeakers or microphones
  • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
  • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
  • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
  • H04R1/406—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers microphones
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R3/00—Circuits for transducers
  • H04R3/04—Circuits for transducers for correcting frequency response
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/10—Applications
  • G10K2210/128—Vehicles
  • G10K2210/1282—Automobiles
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/30—Means
  • G10K2210/301—Computational
  • G10K2210/3012—Algorithms
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/30—Means
  • G10K2210/301—Computational
  • G10K2210/3019—Cross-terms between multiple in's and out's
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/30—Means
  • G10K2210/301—Computational
  • G10K2210/3026—Feedback
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/30—Means
  • G10K2210/301—Computational
  • G10K2210/3046—Multiple acoustic inputs, multiple acoustic outputs
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
  • G10K2210/50—Miscellaneous
  • G10K2210/505—Echo cancellation, e.g. multipath-, ghost- or reverberation-cancellation
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
  • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
  • H04R2499/10—General applications
  • H04R2499/13—Acoustic transducers and sound field adaptation in vehicles

Definitions

• the AAC system may be configured to control, reduce and/or eliminate the acoustic energy and/or wave amplitude of the primary patterns on a surface enclosing the three-dimensional volume.
• the acoustic control zone may include a spherical volume and the AAC system may be configured to control, reduce and/or eliminate the acoustic energy and/or wave amplitude of the primary patterns on a surface of the spherical volume.
• the enclosed space may include any other cabin, e.g., a cabin of an airplane, a cabin of a train, a cabin of a medical system, an area of a room, and the like.
• the AAC zone 110 may include a space around one or more ears of a user.
• AAC system may be implemented as part of headphones, or earphones, e.g., to control sound within AAC zone 110, which may be defined around an ear of a user of the headphones or earphones.
• controller 102 may be configured to evaluate the acoustic pattern of the virtual microphone based on at least one actual acoustic pattern sensed by the at least one microphone 119 (Fig. 1) of array 219.
• AAC system 100 may include a second array 221 of one or more error sensors, e.g., microphones, configured to sense the acoustic residual-noise at one or more of locations 107.
• array 221 may include a plurality of acoustic sensors 121 (Fig.1).
• the input information 195 may include voice and/or audio signals 133 from a voice/audio source 131.
• voice and/or audio signals 133 may include audio and/or voice signals to be heard in the sound control zone 110, e.g., music, a conversation, a phone call, or the like.
• AAC controller 102 may be configured to generate the sound control pattern 109 based on the voice and/or audio signals 133, e.g., as described below.
• AAC controller 102 may be configured to determine the sound control pattern 109 based on any other additional or alternative factors, criteria, attributes, and/or parameters.
• filter adaptation may consume more memory and/or processing resources, e.g., compared to fixed filtering processing.
• filter 152 may be configured to utilize a relatively longer fixed filter, e.g., compared to a length of filter 154, for example, to better represent a predefined filter.
• the fixed filter may be “fine-tuned”, for example, using filter 154 configured to have a lower filter order and/or different architecture.
• the AAC system may include a PF 376, which may be configured to generate a PF output 377 based on a PF input 375.
• PF 376 may be configured to generate PF output 377, for example, based on PF input 375, and an acoustic configuration between the acoustic transducer 308 and an acoustic control zone of the AAC system, e.g., acoustic control zone 110 (Fig. 2).
• PF 376 may be configured to generate PF output 377 based on any other additional or alternative parameters and/or criteria.
• the sound control pattern to be output by the acoustic transducer 308 may be based on the PF output 377.
• the first input signal 361 may be based on the PF output 377.
• the first input signal 361 may include the PF output 377, e.g., as described below.
• the first input signal 361 may be based on the PF output 377 and one or more audio and/or voice signals, e.g., as described below.
• AFB mitigator 450 may be configured to mitigate acoustic feedback 460 between an acoustic transducer 408 and an acoustic sensor 419, for example, a reference noise sensor and/or an error noise sensor in the AAC system, e.g., as described below.
• acoustic transducer 408 may include acoustic transducer 108 (Fig. 1)
• acoustic sensor 419 may include reference noise sensor 119 (Fig. 1) or residual noise sensor 121 (Fig. 1).
• AFB mitigator 450 may include an adder 491 to generate a modified sensor signal 480, for example, by adding the filtered predefined signal 497 to the second input signal 469.
• AFB mitigator 450 may include a first subtractor 492 to generate a first AFB-mitigated signal 483, for example, by subtracting the first filtered signal 463 from the modified sensor signal 480.
• the second filter 454 may be adapted based on a difference between the first AFB-mitigated signal 483 and the second filtered signal 481.
• a residual error signal denoted may be determined, e.g., as follows: (11) wherein @[0] denotes an output of the filter H (signal 481).
• the signal 481 may be determined, e.g., as follows: (12) 7 wherein denotes the impulse response of , denotes the length of 3, and denotes an ⁇ B -sample speaker output, which is the input signal vector to the filter H (input signal 461).
• coefficients of the filter H may be updated, for example, using an LMS algorithm and/or an LMS algorithm variant, e.g., NLMS, Leaky LMS, and/or any other LMS-variant, e.g., as described below. In other aspects, any other suitable algorithm may be used. [000283] In some demonstrative aspects, coefficients of the filter H may be updated, for example, using the LMS algorithm, e.g., as follows: (13) wherein B denotes step size parameter for the filter H.
• the second filter 554 may be implemented by a short adaptive FIR filter, e.g., as described below.
• the second filter 554 may include any other adaptive FIR filter, an adaptive IIR filter, and/or any other adaptive filter.
• AFB mitigator 550 may include a third filter 556 configured to generate a third filtered signal 557, for example, by filtering the first input signal 561, for example, according to and/or based on a third filter function, e.g., as described below.
• the third filter 556 may include an adaptive filter, e.g., as described below.
• the non-hybrid scheme may include a noise prediction filter, which may be applied to a prediction filter input, which is based on a noise input, e.g., noise input 104 (Fig. 1), as described below.
• controller 600 may receive a plurality of inputs 604, e.g., including inputs 104 (Fig. 1), from noise sensors 602, representing acoustic noise at a plurality of predefined noise sensing locations, e.g., locations 105 (Fig. 2).
• the residual-noise prediction filter may be configured to be applied to a prediction filter input, which may be based on a residual- noise input, e.g., as described below.
• controller 800 may include a prediction filter 810 and a prediction filter 820, e.g., as described below.
• controller 800 may generate a sound control signal 829, e.g., including a predicted noise signal, for example, based on an output of the prediction unit 810 and an output of the prediction unit 820.
• vehicle 900 may include any other number of the plurality of speakers 908, the plurality of monitoring microphones 912, and/or the plurality of environment microphones 910, any other arrangement, positions and/or locations of the plurality of speakers 908, the plurality of monitoring microphones 912, and/or the plurality of environment microphones 910, and/or any other additional or alternative components.
• Fig. 10 schematically illustrates an AFB mitigator 1000, in accordance with some demonstrative aspects.
• AFB mitigator 150 (Fig.1) may include one or more elements of, and/or perform one or more functionalities of, adaptive AFB mitigator 1000.
• the second filter 1054 may include any other adaptive FIR filter, an adaptive IIR filter, and/or any other adaptive filter.
• the AFB-mitigated signal 1073 may be processed to provide a signal 1075, for example, according to one or more processing techniques 1088.
• the signal 1075 may be provided as an input to one or more elements of a system or device implementing the at least one acoustic transducer 1008 and the at least one acoustic sensor 1019, e.g., as described below.
• the AFB-mitigated residual-noise signal 1033 may be processed according to one or more residual noise processing techniques 1035.
• controller 193 (Fig.1) may be configured to implement residual noise processing techniques 1035 to process the AFB-mitigated residual-noise signal 1033, which may be generated, for example, based on a residual noise input 106 (Fig. 1), e.g., as described above.
• residual noise processing techniques 1035 may be implemented to adapt one or more parameters of the estimation function of estimator 610 (Fig.6), for example, based on the AFB-mitigated residual-noise signal 1033, e.g., as described above.
• AFB mitigator 1100 may be configured to mitigate the AFB between acoustic transducers 1108 and acoustic sensors 1119, for example, during a speakerphone conversation between the user of the computing device 110 and another person.
• the sensor acoustic pattern sensed by acoustic sensors 1119 may include voice data of the user
• the acoustic pattern generated by the acoustic transducers 1108 may include voice data of the other person, e.g., as received via a communication link between the computing device 1100 and a communication network.
• computing device 1100 may be configured to process the voice data of the user for transmission to the other person, e.g., via the communication network.
• the mitigator output 1173 may be configured to provide a relatively clear “Voice” for the open speaker mode, including the voice of the user of the computing device 1110, which is to be transmitted back to the other side of the line.
• Fig. 12 illustrates a method of adaptive AFB mitigation.
• one or more of the operations of Fig.12 may be performed by one or more components of AAC system 100 (Fig.1), controller 102 (Fig.1), controller 193 (Fig. 1), AFB mitigator 150 (Fig. 1), AFB mitigator 350 (Fig. 3), AFB mitigator 450 (Fig.
• Example 10 includes the subject matter of any one of Examples 7-9, and optionally, comprising an adder to generate a modified sensor signal by adding the filtered predefined signal to the second input signal; a first subtractor to generate a first AFB-mitigated signal by subtracting the first filtered signal from the modified sensor signal; a second subtractor to generate a second AFB-mitigated signal by subtracting from the first AFB-mitigated signal a sum of filtered signals, the sum of filtered signals comprising a sum of the third filtered signal and the filtered predefined signal.
• Example 11 includes the subject matter of Example 10, and optionally, wherein the first input signal is based on an output of a prediction filter, wherein an input to of the prediction filter is based on the second AFB-mitigated signal.
• Example 12 includes the subject matter of Example 1, and optionally, wherein the first filter comprises an adaptive filter, which is adapted based on a subtraction of a filtered predefined signal from the difference between the AFB- mitigated signal and the second filtered signal, wherein the filtered predefined signal comprises a predefined signal filtered by the first filter.
• Example 13 includes the subject matter of Example 12, and optionally, wherein the predefined signal comprises a noise signal.
• Example 26 includes the subject matter of Example 25, and optionally, wherein the instructions, when executed, cause the AFB mitigator to perform one or more operations according to any of Examples 1-24.
• Example 27 includes a method comprising mitigating Acoustic Feedback (AFB) between an acoustic transducer and an acoustic sensor, wherein mitigating the AFB comprises generating by a first filter a first filtered signal by filtering a first input signal, the first input signal based on a transducer acoustic pattern to be output by the acoustic transducer; and generating by a second filter a second filtered signal by filtering the first input signal, wherein the second filter comprises an adaptive filter, which is adapted based on a difference between an AFB-mitigated signal and the second filtered signal, wherein the AFB-mitigated signal is based on a difference between a second input signal and the first filtered signal, wherein the second input signal is based on a sensor acous
• AFB Acoustic Feedback

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• Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Acoustics & Sound (AREA)
• Signal Processing (AREA)
• Health & Medical Sciences (AREA)
• Otolaryngology (AREA)
• Multimedia (AREA)
• General Health & Medical Sciences (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)
• Circuit For Audible Band Transducer (AREA)

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• 2022
  • 2022-02-13 CN CN202280026499.6A patent/CN117529772A/zh active Pending
• 2023
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  • 2023-02-09 WO PCT/IB2023/051173 patent/WO2023152678A1/en not_active Ceased
  • 2023-02-09 CN CN202380024481.7A patent/CN118805387A/zh active Pending
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