WO2009042385A4 - Method and apparatus for generating an audio signal from multiple microphones - Google Patents

Method and apparatus for generating an audio signal from multiple microphones Download PDF

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Publication number
WO2009042385A4
WO2009042385A4 PCT/US2008/075701 US2008075701W WO2009042385A4 WO 2009042385 A4 WO2009042385 A4 WO 2009042385A4 US 2008075701 W US2008075701 W US 2008075701W WO 2009042385 A4 WO2009042385 A4 WO 2009042385A4
Authority
WO
WIPO (PCT)
Prior art keywords
frequency domain
subband signal
signal
domain subband
generating
Prior art date
Application number
PCT/US2008/075701
Other languages
French (fr)
Other versions
WO2009042385A1 (en
Inventor
Holly L Francois
David Pearce
Original Assignee
Motorola Inc
Holly L Francois
David Pearce
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc, Holly L Francois, David Pearce filed Critical Motorola Inc
Publication of WO2009042385A1 publication Critical patent/WO2009042385A1/en
Publication of WO2009042385A4 publication Critical patent/WO2009042385A4/en

Links

Classifications

    • 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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04S—STEREOPHONIC SYSTEMS 
    • H04S1/00—Two-channel systems
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2410/00—Microphones
    • H04R2410/07—Mechanical or electrical reduction of wind noise generated by wind passing a microphone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2430/00—Signal processing covered by H04R, not provided for in its groups
    • H04R2430/03—Synergistic effects of band splitting and sub-band processing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10—General applications
    • H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Computational Linguistics (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Quality & Reliability (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

An apparatus comprises input processors (105, 107) for receiving audio signals from at least a first microphone (101) and a second microphone (103). FFT processors (109, 111) generate a first and second frequency domain subband signal from the audio signals. A combine processor (113) then generates a combined subband signal from the frequency domain subband signals and a synthesis processor (117) generates an output audio signal in response to the combined subband signal. The combine processor (113) generates the combined subband signal by, for each subband, selecting a subband magnitude for the combined subband signal as a lowest magnitude of a subband magnitude for the first frequency domain subband signal and a subband magnitude for the second frequency domain subband signal. The phase of all subbands may be selected as the phase from one of the first and second frequency domain subband signals.

Claims

AMENDED CLAIMS received by the International Bureau on 30 March 2009 (30.03.09)
1. An apparatus for generating an audio signal, the apparatus comprising: a receiver for receiving a first audio signal from a first microphone; a receiver for receiving a second audio signal from a second microphone; first frequency unit for generating a first frequency domain subband signal from the first audio signal; second frequency unit for generating a second frequency domain subband signal from the second audio signal; a combining unit for generating a combined frequency domain subband signal from the first frequency domain subband signal and the second frequency domain subband signal; a generating unit for generating the audio signal in response to the combined frequency domain subband signal ; wherein the combining unit is arranged to select, for each subband of the combined frequency domain subband signal, a subband magnitude for the combined frequency domain subband signal as a lowest magnitude of a subband magnitude for the first frequency domain subband signal and a subband magnitude for the second frequency domain subband signal and using as a phase of the combined frequency domain subband signal the phase from one of the first audio signal and the second audio signal with a lowest summed magnitude.
2. The apparatus of claim 1 wherein the combining unit is arranged to select one of the first frequency domain subband signal and the second frequency domain subband signal as a phase reference frequency domain subband signal and to, for each subband of the combined frequency 31
domain subband signal, set a subband phase to correspond to a subband phase of a corresponding subband of the phase reference frequency domain subband signal .
3. The apparatus of claim 2 wherein the combining unit is arranged to select the phase reference frequency domain subband signal as the first frequency domain subband signal if a power measure for the first frequency domain subband signal is lower than a power measure for the second frequency domain subband signal and to select the phase reference frequency domain subband signal as the second frequency domain subband signal if the power measure for the second frequency domain subband signal is lower than the power measure for the first frequency domain subband signal .
4. The apparatus of claim 1 further comprising: a gain adjustment unit for providing a gain adjustment of the first frequency domain subband signal relative to the second frequency domain subband signal prior to generating the combined frequency domain subband signal .
5. The apparatus of claim 1 further comprising a phase adjustment unit for providing a phase adjustment of the first frequency domain subband signal relative to the second frequency domain subband signal prior to generating the combined frequency domain subband signal.
6. The apparatus of claim 1 wherein the generating unit is arranged to high pass filter the combined frequency domain subband signal.
7. The apparatus of claim 1 wherein the first audio signal comprises a wind noise component and a speech component from a speech source and the second audio signal comprises a different wind noise component and a speech component from the speech source, and wherein the combined frequency domain subband signal has a reduced wind noise component relative to both the first frequency- domain subband signal and the second frequency domain subband signal .
8. The apparatus of claim 1 wherein the first and second microphones are substantially omni -directional microphones .
9. A method of generating an audio signal, the method comprising: receiving a first audio signal from a first microphone; receiving a second audio signal from a second microphone; generating a first frequency domain subband signal from the first audio signal; generating a second frequency domain subband signal from the second audio signal; generating a combined frequency domain subband signal from the first frequency domain subband signal and the second frequency domain subband signal; and generating the audio signal in response to the combined frequency domain subband signal; and wherein generating the combined frequency domain subband signal comprises for each subband of the combined frequency domain subband signal selecting .a subband magnitude for the combined frequency domain subband signal as a lowest magnitude of a subband magnitude for 33 the first frequency domain subband signal and a subband magnitude for the second frequency domain subband signal and using as a phase of the combined frequency domain subband signal the phase from one of the first audio signal and the second audio signal with a lowest summed magnitude.
10, A computer program product enabling the carrying out of a method according to claim 9.
PCT/US2008/075701 2007-09-25 2008-09-09 Method and apparatus for generating an audio signal from multiple microphones WO2009042385A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0718683.6 2007-09-25
GB0718683A GB2453118B (en) 2007-09-25 2007-09-25 Method and apparatus for generating and audio signal from multiple microphones

Publications (2)

Publication Number Publication Date
WO2009042385A1 WO2009042385A1 (en) 2009-04-02
WO2009042385A4 true WO2009042385A4 (en) 2009-05-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2008/075701 WO2009042385A1 (en) 2007-09-25 2008-09-09 Method and apparatus for generating an audio signal from multiple microphones

Country Status (2)

Country Link
GB (1) GB2453118B (en)
WO (1) WO2009042385A1 (en)

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US8724829B2 (en) 2008-10-24 2014-05-13 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for coherence detection
US8620672B2 (en) * 2009-06-09 2013-12-31 Qualcomm Incorporated Systems, methods, apparatus, and computer-readable media for phase-based processing of multichannel signal
EP2641346B2 (en) * 2010-11-18 2023-12-06 Noopl, Inc. Systems and methods for reducing unwanted sounds in signals received from an arrangement of microphones
US8861745B2 (en) * 2010-12-01 2014-10-14 Cambridge Silicon Radio Limited Wind noise mitigation
CN105792071B (en) * 2011-02-10 2019-07-05 杜比实验室特许公司 The system and method for detecting and inhibiting for wind
US11665482B2 (en) 2011-12-23 2023-05-30 Shenzhen Shokz Co., Ltd. Bone conduction speaker and compound vibration device thereof
EP2901448A4 (en) * 2012-09-26 2016-03-30 Nokia Technologies Oy A method, an apparatus and a computer program for creating an audio composition signal
DK2765787T3 (en) 2013-02-07 2020-03-09 Oticon As METHOD OF REDUCING NON-CORRECT NOISE IN AN AUDIO TREATMENT UNIT
CN103945291B (en) * 2014-03-05 2017-05-17 北京飞利信科技股份有限公司 Method and device for achieving orientation voice transmission through two microphones
EP3275208B1 (en) 2015-03-25 2019-12-25 Dolby Laboratories Licensing Corporation Sub-band mixing of multiple microphones
GB2555139A (en) 2016-10-21 2018-04-25 Nokia Technologies Oy Detecting the presence of wind noise
IT201700040732A1 (en) * 2017-04-12 2018-10-12 Inst Rundfunktechnik Gmbh VERFAHREN UND VORRICHTUNG ZUM MISCHEN VON N INFORMATIONSSIGNALEN
US10192566B1 (en) 2018-01-17 2019-01-29 Sorenson Ip Holdings, Llc Noise reduction in an audio system
EP3834200A4 (en) 2018-09-12 2021-08-25 Shenzhen Voxtech Co., Ltd. Signal processing device having multiple acoustic-electric transducers
CN110910893B (en) * 2019-11-26 2022-07-22 北京梧桐车联科技有限责任公司 Audio processing method, device and storage medium

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JP3186892B2 (en) * 1993-03-16 2001-07-11 ソニー株式会社 Wind noise reduction device
KR100718829B1 (en) * 1999-12-24 2007-05-17 코닌클리케 필립스 일렉트로닉스 엔.브이. Multichannel audio signal processing device
DE10045197C1 (en) * 2000-09-13 2002-03-07 Siemens Audiologische Technik Operating method for hearing aid device or hearing aid system has signal processor used for reducing effect of wind noise determined by analysis of microphone signals
AU2003223359A1 (en) * 2002-03-27 2003-10-13 Aliphcom Nicrophone and voice activity detection (vad) configurations for use with communication systems
US7340068B2 (en) * 2003-02-19 2008-03-04 Oticon A/S Device and method for detecting wind noise
EP1581026B1 (en) * 2004-03-17 2015-11-11 Nuance Communications, Inc. Method for detecting and reducing noise from a microphone array
US20060013412A1 (en) * 2004-07-16 2006-01-19 Alexander Goldin Method and system for reduction of noise in microphone signals
JP4356670B2 (en) * 2005-09-12 2009-11-04 ソニー株式会社 Noise reduction device, noise reduction method, noise reduction program, and sound collection device for electronic device

Also Published As

Publication number Publication date
GB0718683D0 (en) 2007-10-31
GB2453118A (en) 2009-04-01
GB2453118B (en) 2011-09-21
WO2009042385A1 (en) 2009-04-02

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