EP1257146B1 - Verfahren und System zur Schallbearbeitung - Google Patents
Verfahren und System zur Schallbearbeitung Download PDFInfo
- Publication number
- EP1257146B1 EP1257146B1 EP02009933A EP02009933A EP1257146B1 EP 1257146 B1 EP1257146 B1 EP 1257146B1 EP 02009933 A EP02009933 A EP 02009933A EP 02009933 A EP02009933 A EP 02009933A EP 1257146 B1 EP1257146 B1 EP 1257146B1
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- EP
- European Patent Office
- Prior art keywords
- sound
- microphone array
- source
- location
- enhancing
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000005236 sound signal Effects 0.000 claims abstract description 43
- 230000002708 enhancing effect Effects 0.000 claims abstract description 39
- 230000001413 cellular effect Effects 0.000 description 2
- 230000005534 acoustic noise Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
Definitions
- the present invention relates to sound signal processing.
- the invention relates to enhancing sound signal quality for use in a sound processing device.
- 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 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 quite likely to move somewhat during use.
- the location of a sound source relative to a microphone array can be estimated by measuring certain characteristics of the signals received from that source by the array of 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 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.
- Granted US patent US-A-4984087 shows a prior art microphone apparatus for a video camera.
- the methods and system of the invention are for use in portable sound processing devices
- the methods and system according to the present invention allow 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 equiped with these microphones.
- the sound source would be a person speaking and the device might be held in his/her hand.
- a method for enhancing sound signal quality as defined in claim 1.
- the method comprises steps of receiving 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 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 changes of relative location of the sound source and microphone array can be tracked even when there is no sound signal.
- the sound-based source location estimation can only track changes in source location when sound is present.
- a system for enhancing sound signal quality as defined in claim 5.
- the system comprises a 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.
- 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.
- a sound from a sound source 412 which may be moving, is received by a microphone array 402.
- a platform motion sensor 400 detects a movement of the microphone array 402.
- a sound signal is provided to a sound enhancing processor 408 and to a source location estimator 406.
- the movement signal is provided to the source location estimator 406.
- step 112 the sound enhancing processor 408 enhances the quality of the sound signal. This enhancement may be performed according to methods known in the art, and is not described further here.
- 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 analysed.
- step 106 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.
- 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.
- step 110 the estimated current location of the sound source 412 relative to the microphone array 402 is obtained, by combining the current 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.
- step 200 a sound from a sound source 412, which may be moving, is received by a microphone array 402.
- 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 source location estimator 406.
- 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 analysed. Results of this estimation are provided to the sound enhancing processor 408.
- step 212 the sound enhancing processor 408 enhances the quality of the sound signal using the results of the estimation performed in step 204.
- 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.
- 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.
- step 210 an estimation of current location of the sound source 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 received in step 212 can be used for further processing in other devices, e.g. speech recognition devices.
- step 300 a sound from a sound source 412, which may be moving, is received by a microphone array 402.
- platform motion sensor 400 detects a movement of the microphone array 402.
- a sound signal is provided to a sound enhancing processor 408 and to a source location estimator 406.
- the movement signal is provided to the source location estimator 406.
- 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 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.
- 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.
- step 310 by combining the current change of source's relative 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.
- step 312 the sound enhancing processor 408 enhances the quality of 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.
- 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 ⁇ s up to 10 ⁇ s.
- FIG. 4 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.
- a system for enhancing sound signal quality 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.
- the source location estimator 406 is connected to the sound enhancing processor 408.
- 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 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 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 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.
- 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 located elsewhere.
- a system in accordance with the invention, or the methods of the invention may be used in various portable devices.
- 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 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.
- PDA personal digital assistant
- Such a network may be in a building, or a cellular telephone, or UMTS/3G network.
- the invention may form part of a Distributed Speech Recognition (DSR) system.
- DSR Distributed Speech Recognition
- some speech processing would be performed remotely, i.e. the processing would be carried out at at least two different locations.
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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)
Claims (8)
- Verfahren zum Verbessern einer Tonsignalqualität zur Verwendung in einem portablen Tonverarbeitungsgerät, wobei das Verfahren die folgenden Schritte aufweist:- Empfangen (300) eines Tons von einer Tonquelle (412) durch ein Mikrophon-Array (402);- Detektieren (302) einer Bewegung des Mikrophon-Arrays (402) durch einen Plattformbewegungssensor (400) und Erzeugen eines Bewegungssignals, das eine solche Bewegung anzeigt;- Vorsehen eines Tonsignals von dem Mikrophon-Array (402) für einen Tonverbesserungsprozessor (408) und für eine Quellenstandortschätzeinrichtung (406);- Vorsehen des Bewegungssignals von dem Plattformbewegungssensor (400) an die Quellenstandortschätzeinrichtung (406);- wobei die Quellenstandortschätzeinrichtung (406) einen momentanen Standort der Tonquelle (412) relativ zu dem Mikrophon-Array (402) unter Verwendung des Tonsignals von dem Mikrophon-Array und des Signals, das durch den Plattformbewegungssensor bereitgestellt wird, schätzt;- Vorsehen eines Ergebnisses der Schätzung des momentanen Standorts der Tonquelle (412) relativ zu dem Mikrophon-Array (402) für den Tonverbesserungsprozessor (408);- wobei der Tonverbesserungsprozessor (408) die Tonsignalqualität verbessert (312);- Vorsehen des verbesserten Tonsignals für ein Tonverarbeitungsgerät.
- Verfahren gemäß Anspruch 1, wobei die Schätzung des momentanen Standorts der Tonquelle relativ zu dem Mikrophon-Array die folgenden Schritte aufweist:- Schätzen (206) einer Positionsänderung des Mikrophon-Arrays auf der Basis des Bewegungssignals von dem Plattformbewegungssensor;- Schätzen (208) einer momentanen Änderung eines Quellenrelativstandorts auf der Basis eines Ergebnisses der Schätzung des Standorts der Tonquelle relativ zu dem Mikrophon-Array und der Schätzung der Positionsänderung des Mikrophon-Arrays;- Kombinieren (210) der momentanen Änderung des Quellenrelativstandorts mit dem Standort der Tonquelle relativ zu dem Mikrophon-Array.
- Verfahren gemäß Anspruch 1 oder Anspruch 2, wobei zum Zwecke der Schätzung eines Standorts der Tonquelle relativ zu dem Mikrophon-Array Langzeitintervalle des Tonsignals analysiert werden, wobei die Langzeitintervalle in dem Bereich von 10ms bis 1s liegen.
- Verfahren gemäß einem vorhergehenden Anspruch, wobei zum Zwecke der Schätzung der Positionsänderung des Mikrophon-Arrays Kurzzeitintervalle des Bewegungssignals analysiert werden, wobei die Kurzzeitintervalle in dem Bereich von 0,1µs bis 10µs liegen.
- Vorrichtung zum Verbessern einer Tonsignalqualität zur Verwendung in einem portablen Tonverarbeitungsgerät (410), wobei die Vorrichtung aufweist:einen Tonverbesserungsprozessor (408);eine Quellenstandortschätzeinrichtung (406), die mit dem Tonverbesserungsprozessor verbunden ist;ein Mikrophon-Array (402), das mit dem Tonverbesserungsprozessor (408) und der Quellenstandortschätzeinrichtung (406) verbunden ist; undeinen Plattformbewegungssensor (400), der mit der Quellenstandortschätzeinrichtung (406) verbunden ist;wobei das Mikrophon-Array (402) derart betreibbar ist, dass es dem Tonverbesserungsprozessor (408) und der Quellenstandortschätzeinrichtung (406) ein Tonsignal bereitstellt;
wobei der Plattformbewegungssensor (400) derart betreibbar ist, dass er der Quellenstandortschätzeinrichtung (406) ein Bewegungssignal bereitstellt;
wobei die Quellenstandortschätzeinrichtung (406) derart betreibbar ist, dass sie einen momentanen Standort der Tonquelle (412) relativ zu dem Mikrophon-Array (402) unter Verwendung des Tonsignals von dem Mikrophon-Array und des Bewegungssignals, das durch den Plattformbewegungssensor bereitgestellt wird, schätzt;
wobei die Quellenstandortschätzeinrichtung derart betreibbar ist, dass sie ein Ergebnis der Schätzung des momentanen Standorts der Tonquelle (412) relativ zu dem Mikrophon-Array (402) dem Tonverbesserungsprozessor (408) bereitstellt;
wobei der Tonverbesserungsprozessor (408) derart betreibbar ist, dass er die Tonsignalqualität verbessert (302) und ein verbessertes Tonsignal einem Tonverarbeitungsgerät bereitstellt. - Vorrichtung gemäß Anspruch 5, wobei der Plattformbewegungssensor (400) an dem Mikrophon-Array fixiert ist.
- Vorrichtung gemäß Anspruch 5 oder Anspruch 6, wobei das Tonverarbeitungsgerät ein Spracherkennungsmodul ist.
- Mobiltelefon, portables oder mobiles PMR-Funkgerät, Handcomputer (PDA = Personal Digital Assistant) oder Laptop-Computer, das/der die Vorrichtung zum Verbessern der Tonsignalqualität gemäß einem der Ansprüche 5 bis 8 umfasst.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0110861A GB2375276B (en) | 2001-05-03 | 2001-05-03 | Method and system of sound processing |
GB0110861 | 2001-05-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1257146A2 EP1257146A2 (de) | 2002-11-13 |
EP1257146A3 EP1257146A3 (de) | 2004-01-07 |
EP1257146B1 true EP1257146B1 (de) | 2006-07-19 |
Family
ID=9913962
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02009933A Expired - Lifetime EP1257146B1 (de) | 2001-05-03 | 2002-05-03 | Verfahren und System zur Schallbearbeitung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1257146B1 (de) |
AT (1) | ATE333774T1 (de) |
DE (1) | DE60213155T2 (de) |
GB (1) | GB2375276B (de) |
PT (1) | PT1257146E (de) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6675027B1 (en) | 1999-11-22 | 2004-01-06 | Microsoft Corp | Personal mobile computing device having antenna microphone for improved speech recognition |
US7383181B2 (en) | 2003-07-29 | 2008-06-03 | Microsoft Corporation | Multi-sensory speech detection system |
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 |
US7574008B2 (en) | 2004-09-17 | 2009-08-11 | Microsoft Corporation | Method and apparatus for multi-sensory speech enhancement |
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 |
US9185488B2 (en) * | 2009-11-30 | 2015-11-10 | Nokia Technologies Oy | Control parameter dependent audio signal processing |
JP5407848B2 (ja) * | 2009-12-25 | 2014-02-05 | 富士通株式会社 | マイクロホンの指向性制御装置 |
EP2638694A4 (de) * | 2010-11-12 | 2017-05-03 | Nokia Technologies Oy | Tonverarbeitungsvorrichtung |
US20120183156A1 (en) * | 2011-01-13 | 2012-07-19 | Sennheiser Electronic Gmbh & Co. Kg | Microphone system with a hand-held microphone |
CN104244142B (zh) * | 2013-06-21 | 2018-06-01 | 联想(北京)有限公司 | 一种麦克风阵列、实现方法及电子设备 |
GB2521175A (en) * | 2013-12-11 | 2015-06-17 | Nokia Technologies Oy | Spatial audio processing apparatus |
WO2017218399A1 (en) | 2016-06-15 | 2017-12-21 | Mh Acoustics, Llc | Spatial encoding directional microphone array |
US10477304B2 (en) | 2016-06-15 | 2019-11-12 | Mh Acoustics, Llc | Spatial encoding directional microphone array |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3025359A (en) * | 1960-02-25 | 1962-03-13 | Gulton Ind Inc | Vibration-compensated pressure sensitive microphone |
US4984087A (en) * | 1988-05-27 | 1991-01-08 | Matsushita Electric Industrial Co., Ltd. | Microphone apparatus for a video camera |
WO1995013690A1 (fr) * | 1993-11-08 | 1995-05-18 | Sony Corporation | Detecteur d'angle et appareil de lecture audio utilisant ledit detecteur |
DE19943872A1 (de) * | 1999-09-14 | 2001-03-15 | Thomson Brandt Gmbh | Vorrichtung zur Anpassung der Richtcharakteristik von Mikrofonen für die Sprachsteuerung |
-
2001
- 2001-05-03 GB GB0110861A patent/GB2375276B/en not_active Expired - Fee Related
-
2002
- 2002-05-03 DE DE60213155T patent/DE60213155T2/de not_active Expired - Fee Related
- 2002-05-03 EP EP02009933A patent/EP1257146B1/de not_active Expired - Lifetime
- 2002-05-03 PT PT02009933T patent/PT1257146E/pt unknown
- 2002-05-03 AT AT02009933T patent/ATE333774T1/de not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB0110861D0 (en) | 2001-06-27 |
ATE333774T1 (de) | 2006-08-15 |
GB2375276A (en) | 2002-11-06 |
EP1257146A3 (de) | 2004-01-07 |
EP1257146A2 (de) | 2002-11-13 |
PT1257146E (pt) | 2006-11-30 |
DE60213155T2 (de) | 2007-07-26 |
DE60213155D1 (de) | 2006-08-31 |
GB2375276B (en) | 2003-05-28 |
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