GB2375276A - Method and system of sound processing - Google Patents

Method and system of sound processing Download PDF

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Publication number
GB2375276A
GB2375276A GB0110861A GB0110861A GB2375276A GB 2375276 A GB2375276 A GB 2375276A GB 0110861 A GB0110861 A GB 0110861A GB 0110861 A GB0110861 A GB 0110861A GB 2375276 A GB2375276 A GB 2375276A
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Prior art keywords
sound
microphone array
location
source
relative
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GB0110861A
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GB2375276B (en
GB0110861D0 (en
Inventor
David John Benjamin Pearce
James Alexander Rex
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Motorola Solutions Inc
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Motorola Inc
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Priority to GB0110861A priority Critical patent/GB2375276B/en
Publication of GB0110861D0 publication Critical patent/GB0110861D0/en
Priority to EP02009933A priority patent/EP1257146B1/en
Priority to AT02009933T priority patent/ATE333774T1/en
Priority to DE60213155T priority patent/DE60213155T2/en
Priority to PT02009933T priority patent/PT1257146E/en
Publication of GB2375276A publication Critical patent/GB2375276A/en
Application granted granted Critical
Publication of GB2375276B publication Critical patent/GB2375276B/en
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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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

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  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

A device 410 such as a mobile phone utilises a directional microphone array to discriminate voice signals from background noises. In order to do this, the location of a sound source relative to the array 412 must be known 402. The location of the source may be determined from signals produced in the microphone array but if the array is moved during a period of silence, it may take a long time for the source location to be reestablished. In order to mitigate this, a platform motion sensor 400 which may include a gyroscope and/or an accelerometer is attached to the microphone array. The location of the sound source may be estimated in a source location estimator 406 on the basis of the sound signal from the microphone array, and signals from the motion sensor. Results of the estimation are used by a sound enhancing processor for enhancing signal quality. The enhanced sound and source location estimate may be passed to a speech recognition module.

Description

- -: 2375276
METHOD AND SYSTEM OF SOUND PROCESSING
Technical Field
The present invention relates to sound signal processing. In particular, the invention relates to enhancing sound signal quality for use in a sound processing device.
Background
In known methods of enhancing sound signal quality, pick-up of noise and reverberation may be reduced by employing an array of remote microphones. The remote microphones' outputs are processed and then combined into a single signal that has an improved signal quality.
The best processing parameters to use in the microphone array depend on the location of the desired sound source relative to the microphones. Many 20 arrays reject noise by having much higher sensitivity to sound coming from the direction (or region) of the desired source than to sounds from elsewhere, where noise sources are located. However, the source's relative location is often unknown initially, and may change over time. For example, people often move their heads whilst speaking, and if an array is in a hand-held device, it is 25 quite likely to move somewhat during use.
The location of a sound source relative to a microphone array, according to methods known in the art, can be estimated by measuring certain characteristics of the signals received from that source by the array of 30 microphones. An example of one such characteristic is cross-power spectral phase. The other method of location of a sound source relative to a microphone array is estimation by visually imaging the source, with a camera mounted on 35 the same base as the array. The camera image is processed to locate the source within it, using known visual characteristics of the source. For example, a speaker's mouth may be located by looking for his/her face in the image.
) Summary of the Invention
It is an object of the present invention to provide novel methods and a 5 system for enhancing sound signal quality which overcome the disadvantages of the prior art. The methods and system of the invention are for use in portable
sound processing devices The methods and system according to thetpresent invention allow 10 processing of sound signals that result in increased quality. The output signal has decreased content of acoustic noise and reverberation caused by surroundings. The output signal is also less sensitive to changes of location of a sound source relative to the microphones. These changes of location are caused both by movement of the sound source, and movement of the device 15 equiped with these microphones. In a typical example, the sound source would be a person speaking and the device might be held in his/her hand.
In accordance with the present invention, there is thus provided a method for enhancing sound signal quality. The method comprises steps of receiving 20 sound from sound source by a microphone array and detecting a movement of this microphone array. The movement is detected by a platform motion sensor.
Current location of the sound source relative to the microphone array is estimated on the basis of the sound signal from the microphone array and signals from the platform motion sensor. Results of this estimation are used for 25 enhancing output sound signal quality.
An advantage of the present invention is that the motion sensor can continously track the motion of the microphone array, and use this to adjust the current estimate of the relative location of the desired sound source. The 30 changes of relative location of the sound source and microphone array can be tracked even when there is no sound signal. In contrast, the sound-based source location estimation can only track changes in source location when sound is present.
35 There are frequent silences during normal speech, not only between words or sentences, but also within words. If the microphone array was moved during such a silence, and speech then restarted, it would take a relatively long time for a sound-based source location estimator on its own to obtain an
I' accurate estimate of the changed location. The result would be an initial reduction in output sound quality. The present invention, on the other hand, would use information from the motion sensor to continually adjust the source location estimate. Hence, when speech restarts after a silence, there is no initial 5 reduction in output sound quality. This assumes that only the microphone array moves significantly, not the speech source.
In accordance with another aspect of the present invention, there is provided a system for enhancing sound signal quality. The system comprises a 10 microphone array and a platform motion sensor that are connected to a source location estimator. Additionally the microphone array is connected to a sound enhancing processor. The sound enhancing processor is connected to a source location estimator.
Brief description of the drawings
The present invention will be understood and appreciated more fully from the following detailed description taken in conjunction with the drawings in
20 which: Figure 1 is a flowchart illustrating a method of preparing input signals for use in portable sound processing devices in accordance with an embodiment of the present invention; 25 Figure 2 is a flowchart illustrating a method of enhancing quality of output sound signals for use in portable sound processing devices in accordance with another embodiment of the present invention; Figure 3 is a flowchart illustrating a further method of enhancing quality of 30 output sound signals for use in portable sound processing devices in accordance with another embodiment of the present invention; Figure 4 is a schematic illustration of a system for enhancing quality of output sound signals operative in accordance with the present invention.
r r l Detailed description of the preferred embodiment
The term a "movement signal" herein below refers to a signal generated and provided by a platform motion sensor.
A microphone array mentioned herein below refers to a set of microphones that are a part of a portable device. Such a portable device is typically in a user's hand, during use, and may be subject to various rotational and translational movements.
Referring to figures 1 and 4, in step 100 a sound from a sound source 412, which may be moving, is received by a microphone array 402. In step 102, a platform motion sensor 400 detects a movement of the microphone array 402.
Afterwards, a sound signal is provided to a sound enhancing processor 408 and 15 to a source location estimator 406. At the same time the movement signal is provided to the source location estimator 406.
In step 11 2 the sound enhancing processor 408 enhances the quality of the sound signal. This enhancement may be performed according to methods 20 known in the art, and is not described further here.
In step 104, on the basis of this sound signal, an estimation of a location of the sound source 412 relative to the microphone array 402 is performed. For the purpose of this estimation, long time intervals of the sound signal are 25 analysed. Simultaneously in step 1 06, on the basis of the movement signal, an estimation of a change of position of the microphone array 402 is performed.
For the purpose of this estimation, short time intervals of the movement signal are analysed.
30 in step 108, on the basis of results of estimations performed in steps 104 and 106, a current change of source's relative location is estimated.
Finally in step 110, the estimated current location of the sound source 412 relative to the microphone array 402 is obtained, by combining the current 35 change of source's relative location from step 108 with the location of the sound source 412 relative to the microphone array 402.
: - - Results of the estimation obtained in step 110 and the enhanced signal received in step 112 can be used for further processing in other devices, e.g. speech recognition devices.
5 In Fig. 2, in step 200, a sound from a sound source 412, which may be moving, is received by a microphone array 402. In step 202, platform motion sensor 400 detects a movement of the microphone array 402. Afterwards, a sound signal is provided to a sound enhancing processor 408 and to a source location estimator 406. At the same time the movement signal is provided to the 10 source location estimator 406.
In step 204, on the basis of this sound signal, an estimation of a location of the sound source 412 relative to the microphone array 402 is performed. For the purpose of this estimation, long time intervals of the sound signal are 15 analysed. Results of this estimation are provided to the sound enhancing processor 408.
In step 212 the sound enhancing processor 408 enhances the quality of the sound signal using the results of the estimation performed in step 204.
Simultaneously in step 206, on the basis of the movement signal, an estimation of a change of position of the microphone array 402 is performed.
For the purpose of this estimation, short time intervals of the movement signal are analysed.
In step 208, on the basis of results of estimations performed in steps 204 and 206, a current change of the source's relative location is estimated.
Finally, in step 210, an estimation of current location of the sound source 30 412 relative to the microphone array 402 is performed, by combining the current change of the source's relative location from step 208 with the location of the sound source 412 relative to the microphone array 402.
Results of the estimation obtained in step 210 and the enhanced signal 35 received in step 212 can be used for further processing in other devices, e.g. speech recognition devices.
r A, In fig. 3, in step 300 a sound from a sound source 412, which may be moving, is received by a microphone array 402. In step 302, platform motion sensor 400 detects a movement of the microphone array 402. Afterwards, a sound signal is provided to a sound enhancing processor 408 and to a source 5 location estimator 406. At the same time, the movement signal is provided to the source location estimator 406.
In step 304, on the basis of this sound signal, an estimation of a location of the sound source 412 relative to the microphone array 402 is performed. For 10 the purpose of this estimation, long time intervals of the sound signal are analysed. Simultaneously, in step 306, on the basis of the movement signal an estimation of a change of position of the microphone array 402 is performed.
For the purpose of this estimation, short time intervals of the movement signal are analysed.
In step 308, on the basis of results of estimations performed in steps 304 and 306, a current change of the source's relative location is estimated.
Finally, in step 310, by combining the current change of source's relative 20 location from step 308 with the location of the sound source 412 relative to the microphone array 402, the estimated current location of the sound source 412 relative to the microphone array 402 is obtained.
In step 312 the sound enhancing processor408 enhances the quality of 25 the sound signal using the results of the estimation performed in step 310.
The sound signal of enhanced quality obtained in step 312 can be used for further processing in other devices, e.g. speech recognition devices.
30 The long time interval referenced in steps 104, 204 and 304 is typically in the range from 10 ms up to 1 s.
The short time interval referenced in steps 106, 206 and 306 is typically in the range from 0.1 1ls up to 10 As.
,r Rae Reference is now made to Fig.4, which depicts a system for enhancing quality of an output sound signal, operative in accordance with the embodiment of the present invention as illustrated in Fig.3.
5 A system for enhancing sound signal quality, according to the present invention, comprises a microphone array 402, that is connected to a sound enhancing processor 408, and to a source location estimator 406. The system also comprises a platform motion sensor 400 that is connected to the source location estimator 406.
In accordance with some embodiments of the present invention, the source location estimator 406 may be connected to the sound enhancing processor 408.
15 The microphone array 402 consists of two or more microphones 404. An array of at least two microphones can provide output signals that can be used to estimate both the direction and distance of a source of sound.
The platform motion sensor 400 comprises at least one gyroscope and/or 20 accelerometer. The platform motion sensor 400 is fixed to the microphone array 402, or to any other part of the portable sound processing device 410 that forms one unit with the microphone array 402.
The source location estimator 406 and sound enhancing processor 408 25 have respectively a first signal output connection and a second signal output connection. The invention uses the signal from platform motion sensor 400 to provide an indication of movements of the microphone array 402. Therefore it is 30 necessary that sensor 400 and microphone array 402 be linked so that the signal from sensor 400 relates to the motion of microphone array 402. Such a link may simply include sensor 400 being attached to array 402, or both being attached to the same housing. Therefore, although figure 4 shows elements 400,402, 406 and 408 all in one unit, elements 406 and 408 may in fact be 35 located elsewhere.
A- r, _ _ A.; ..._
A system in accordance with the invention, or the methods of the invention may be used in various portable devices. In particular, the invention is usable in portable radio communication devices. Therefore the system may be used in a mobile telephone or a portable or mobile PMR radio. The invention 5 also may be used in a personal digital assistant (PDA) or laptop computer, linked for example by a radio or infra-red communication link to a cellular network. Such a network may be in a building, or a cellular telephone, or UMTS/3G network.
10 The invention may form part of a Distributed Speech Recognition (DSR) system. In such a system, some speech processing would be performed remotely, i.e. the processing would be carried out at at least two different locations.

Claims (1)

  1. A., ,., , I' Claims
    1. A method of preparing input signals for use in a portable sound processing device, the method comprising the steps of: 5 - receiving (100) a sound from a sound source (412) by a microphone array (402);
    - detecting (102) a movement of said microphone array (402) by a platform motion sensor (400); - providing a sound signal from said microphone array (402) to a sound 10 enhancing processor (408) and to a source location estimator (406); - providing a movement signal from said platform motion sensor (400) to said source location estimator (406); - said sound enhancing processor (408) enhancing (112) a sound signal quality; 15 said source location estimator (406) estimating (110) a current location of said sound source (412) relative to said microphone array (402); providing said enhanced sound signal to a sound processing device; providing to said sound processing device a result of said estimation of said current location of said sound source relative to said microphone array.
    2. A method according to claim 1 wherein said estimation of said current location of said sound source relative to said microphone array comprises the steps of: - estimating (104) a location of said sound source relative to said 25 microphone array on the basis of said sound signal; estimating (106) a change of position of said microphone array on the basis of said movement signal; - estimating (108) a current change of a source's relative location on the basis of a result of said estimation of said location of said sound source 30 relative to said microphone array and said estimation of said change of position of said microphone array; combining (110) said current change of said source's relative location with said location of said sound source relative to said microphone array.
    35 3. A method according to claim 2 wherein, for the purpose of said estimation of said location of said sound source relative to said microphone array, long time intervals of said sound signal are analysed.
    1l] 4. A method according to claim 3 wherein said long time intervals are in a range from 1 Oms to 1 s.
    S 5. A method according to claim 2 wherein, for the purpose of said estimation of said change of position of said microphone array, short time intervals of said movement signal are analysed.
    6. A method according to claim 5 wherein said short time intervals are in a 10 range from 0.1ps to 10ps.
    7. A method according to claim 1 wherein said sound processing device is a speech recognition module.
    15 8. A method of enhancing a sound signal quality, for use in a portable sound processing device, the method comprising the steps of: - receiving (200) a sound from a sound source (412) by a microphone array (402);
    - detecting (202) a movement of said microphone array (402) by a platform 20 motion sensor (400); - providing a sound signal from said microphone array (402) to a sound enhancing processor (408) and to a source location estimator (406); - providing a movement signal from said platform motion sensor (400) to said source location estimator (406); 25 - performing an estimation (204) of a location of said sound source (412) relative to said microphone array (402) by said source location estimator (406); providing a result of said estimation of a location of said sound source (412) relative to said microphone array (402) to said sound enhancing processor (408);
    30 - said sound enhancing processor (408) enhancing (212) said sound signal quality; - performing (204) an estimation of a current location of said sound source (412) relative to said microphone array (402) by said source location estimator (406); - providing said enhanced sound signal to a sound processing device; 35 - providing a result of said estimation of said current location of said sound source (412) relative to said microphone array (402) to said sound processing device.
    1 1 9. A method according to claim 8 wherein said estimation (204) of a location of said sound source relative to said microphone array is performed on the basis of said sound signal only.
    10.A method according to claim 9 wherein, forthe purpose of said estimation of a location of said sound source relative to said microphone array, long time intervals of said sound signal are analysed.
    10 11.A method according to claim 10 wherein said long time intervals are in a range from 10ms to 1s.
    12.A method according to claim 8 wherein said estimation of said current location of said sound source relative to said microphone array comprises 15 the steps of: - estimating (206) a change of position of said microphone array on the basis of said movement signal from said platform motion sensor; - estimating (208) a current change of a source's relative location on the basis of a result of said estimation of said location of said sound source 20 relative to said microphone array and said estimation of said change of position of said microphone array; - combining (210) said current change of said source's relative location with said location of said sound source relative to said microphone array.
    25 13.A method according to claim 12 wherein, forthe purpose of said estimation of said change of position of said microphone array, short time intervals of said movement signal are analysed.
    14.A method according to claim 13 wherein said short time intervals are in a 30 range from 0.11ls to 10ps.
    1 5.A method according to claim 8 wherein, for the purpose of said enhancing of said sound signal quality, said result of said estimation of a location of said sound source relative to said microphone array is used.
    16.A method according to claim 8 wherein said sound processing device is a speech recognition module.
    r r. r , f . 17.A method of enhancing a sound signal quality, for use in a portable sound processing device, the method comprising the steps of: receiving (300) a sound from a sound source (412) by a microphone array 5 (402);
    - detecting (302) a movement of said microphone array (402) by a platform motion sensor (400); - providing a sound signal from said microphone array (402) to a sound enhancing processor (408) and to a source location estimator (406); 10 - providing a movement signal from said platform motion sensor (400) to said source location estimator (406); - said source location estimator (406) estimating a current location of said sound source (412) relative to said microphone array (402); - providing a result of said estimation of said current location of said sound 15 source (412) relative to said microphone array (402) to said sound enhancing processor (408); - said sound enhancing processor (408) enhancing said sound signal quality; - providing said enhanced sound signal to a sound processing device.
    20 18.A method according to claim 17 wherein said estimation of said current location of said sound source relative to said microphone array comprises the steps of: - estimating (304) a location of said sound source relative to said microphone array on the basis of said sound signal; 25 estimating (306) a change of position of said microphone array on the basis of said movement signal; - estimating (308) a current change of a source's relative location on the basis of a result of said estimation of said location of said sound source relative to said microphone array and said estimation of said change of 30 position of said microphone array; combining (310) said current change of said source's relative location with said location of said sound source relative to said microphone array.
    19.A method according to claim 18 wherein, for the purpose of said estimation 35 (304) of said location of said sound source relative to said microphone array, long time intervals of said sound signal are analysed.
    20.A method according to claim 19 wherein said long time intervals are in a range from 1 ems to 1 s.
    21.A method according to claim 18 wherein, for the purpose of said estimation S of said change of position of said microphone array, short time intervals of said movement signal are analysed.
    22.A method according to claim 21 wherein said short time intervals are in a range from 0.11ls to 10ps.
    23.A method according to claim 17 wherein, for the purpose of said enhancing (312) of said sound signal quality, said result of said estimation of said current location of said sound source is used.
    15 24.A method according to claim 17 wherein said sound processing device is a speech recognition module.
    25.A system for enhancing sound signal quality for use in a portable sound processing device (410), said system comprises: 20 - a sound enhancing processor (408); - a source location estimator (406); - a microphone array (402), that is connected to said sound enhancing processor (408) and to said source location estimator (406); - a platform motion sensor(400) that is connected to said source location 25 estimator(406).
    26.A system according to claim 25 wherein said source location estimator (406) is connected to said sound enhancing processor.
    30 27.A system according to claim 25 or 26 wherein said microphone array (402) consists of at least two microphones.
    28.A system according to claim 25 wherein said platform motion sensor (400) is fixed to said microphone array.
    29.A system according to any of claims 25 - 27 wherein said platform motion sensor (400) consists of at least one gyroscope.
    rr 30.A system according to any of claims 25 - 27 wherein said platform motion sensor (400) consists of at least one accelerometer.
    5 31.A system according to any of claims 25 - 27 wherein said platform motion sensor (400) consists of a set of at least one accelerometer and at least one gyroscope. 32.A mobile telephone, a portable or mobile PMR radio, a personal digital 10 assistant (PDA), or a laptop computer being adapted to operate in accordance with the method of any of claims 1 - 7.
    33.A mobile telephone, a portable or mobile PMR radio, a personal digital assistant (PDA), or a laptop computer being adapted to operate in IS accordance with the method of any of claims 8 - 16.
    34.A mobile telephone, a portable or mobile PMR radio, a personal digital assistant (PDA), or a laptop computer being adapted to operate in accordance with the method of any of claims 17 - 24.
    35.A mobile telephone, a portable or mobile PMR radio, a personal digital assistant (PDA), or a laptop computer comprising a system according to any of claims 25 - 31.
GB0110861A 2001-05-03 2001-05-03 Method and system of sound processing Expired - Fee Related GB2375276B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
GB0110861A GB2375276B (en) 2001-05-03 2001-05-03 Method and system of sound processing
EP02009933A EP1257146B1 (en) 2001-05-03 2002-05-03 Method and system of sound processing
AT02009933T ATE333774T1 (en) 2001-05-03 2002-05-03 METHOD AND SYSTEM FOR SOUND PROCESSING
DE60213155T DE60213155T2 (en) 2001-05-03 2002-05-03 Method and system for sound processing
PT02009933T PT1257146E (en) 2001-05-03 2002-05-03 Method and system of sound processing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0110861A GB2375276B (en) 2001-05-03 2001-05-03 Method and system of sound processing

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GB2375276A true GB2375276A (en) 2002-11-06
GB2375276B GB2375276B (en) 2003-05-28

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AT (1) ATE333774T1 (en)
DE (1) DE60213155T2 (en)
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PT (1) PT1257146E (en)

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US7120477B2 (en) 1999-11-22 2006-10-10 Microsoft Corporation Personal mobile computing device having antenna microphone and speech detection for improved speech recognition
US7283850B2 (en) 2004-10-12 2007-10-16 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement on a mobile device
US7346504B2 (en) 2005-06-20 2008-03-18 Microsoft Corporation Multi-sensory speech enhancement using a clean speech prior
US7406303B2 (en) 2005-07-05 2008-07-29 Microsoft Corporation Multi-sensory speech enhancement using synthesized sensor signal
US7447630B2 (en) 2003-11-26 2008-11-04 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement
US7499686B2 (en) 2004-02-24 2009-03-03 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement on a mobile device
US7680656B2 (en) 2005-06-28 2010-03-16 Microsoft Corporation Multi-sensory speech enhancement using a speech-state model
US7930178B2 (en) 2005-12-23 2011-04-19 Microsoft Corporation Speech modeling and enhancement based on magnitude-normalized spectra
US10356514B2 (en) 2016-06-15 2019-07-16 Mh Acoustics, Llc Spatial encoding directional microphone array
US10477304B2 (en) 2016-06-15 2019-11-12 Mh Acoustics, Llc Spatial encoding directional microphone array

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Cited By (11)

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US7120477B2 (en) 1999-11-22 2006-10-10 Microsoft Corporation Personal mobile computing device having antenna microphone and speech detection for improved speech recognition
US7447630B2 (en) 2003-11-26 2008-11-04 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement
US7499686B2 (en) 2004-02-24 2009-03-03 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement on a mobile device
US7283850B2 (en) 2004-10-12 2007-10-16 Microsoft Corporation Method and apparatus for multi-sensory speech enhancement on a mobile device
US7346504B2 (en) 2005-06-20 2008-03-18 Microsoft Corporation Multi-sensory speech enhancement using a clean speech prior
US7680656B2 (en) 2005-06-28 2010-03-16 Microsoft Corporation Multi-sensory speech enhancement using a speech-state model
US7406303B2 (en) 2005-07-05 2008-07-29 Microsoft Corporation Multi-sensory speech enhancement using synthesized sensor signal
US7930178B2 (en) 2005-12-23 2011-04-19 Microsoft Corporation Speech modeling and enhancement based on magnitude-normalized spectra
US10356514B2 (en) 2016-06-15 2019-07-16 Mh Acoustics, Llc Spatial encoding directional microphone array
US10477304B2 (en) 2016-06-15 2019-11-12 Mh Acoustics, Llc Spatial encoding directional microphone array
US10659873B2 (en) 2016-06-15 2020-05-19 Mh Acoustics, Llc Spatial encoding directional microphone array

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ATE333774T1 (en) 2006-08-15
PT1257146E (en) 2006-11-30
GB2375276B (en) 2003-05-28
DE60213155T2 (en) 2007-07-26
GB0110861D0 (en) 2001-06-27
EP1257146A2 (en) 2002-11-13
EP1257146B1 (en) 2006-07-19
DE60213155D1 (en) 2006-08-31
EP1257146A3 (en) 2004-01-07

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