EP0615226A2 - Procédé de réduction de bruit pour canaux de parole pertubés - Google Patents
Procédé de réduction de bruit pour canaux de parole pertubés Download PDFInfo
- Publication number
- EP0615226A2 EP0615226A2 EP94102963A EP94102963A EP0615226A2 EP 0615226 A2 EP0615226 A2 EP 0615226A2 EP 94102963 A EP94102963 A EP 94102963A EP 94102963 A EP94102963 A EP 94102963A EP 0615226 A2 EP0615226 A2 EP 0615226A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- channels
- speech
- interference
- noise reduction
- individual
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 230000009467 reduction Effects 0.000 title claims abstract description 12
- 238000009499 grossing Methods 0.000 claims description 10
- 230000003595 spectral effect Effects 0.000 claims description 10
- 230000003044 adaptive effect Effects 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 4
- 238000001228 spectrum Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 3
- 230000010363 phase shift Effects 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 description 5
- 238000012805 post-processing Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000012935 Averaging Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 101000822695 Clostridium perfringens (strain 13 / Type A) Small, acid-soluble spore protein C1 Proteins 0.000 description 1
- 101000655262 Clostridium perfringens (strain 13 / Type A) Small, acid-soluble spore protein C2 Proteins 0.000 description 1
- 101000655256 Paraclostridium bifermentans Small, acid-soluble spore protein alpha Proteins 0.000 description 1
- 101000655264 Paraclostridium bifermentans Small, acid-soluble spore protein beta Proteins 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- G10L2021/02166—Microphone arrays; Beamforming
Definitions
- the invention relates to a method according to the preamble of patent claim 1.
- Such a method is used in automatic speech recognition or in hands-free systems to improve speech quality, e.g. in offices or in a motor vehicle.
- Disrupted speech is easier to grasp if it is recorded with two or more channels. Language and interference should be present in each channel.
- the multi-channel signals are processed with digital signal processing.
- the transit time difference of the useful signal in the individual channels must first be determined. It will later be possible to merge the individual channels into one channel in the correct phase.
- an acoustic directional lobe is set for this event.
- the noise reduction is first carried out in each individual channel. Since the noise reduction does not work correctly, distortions and artificial insertions (e.g. "musical tones") can occur. When merging the individual processed channels, these errors are averaged and thus reduced.
- the sum signal is then post-processed using the cross-correlation of the signals in the individual channels. It is assumed that interference or reverberation is less correlated than the useful signal of the channels.
- a method for merging 2 disturbed speech channels is described in the publication "Multimicrophone signal-processing technique to remove room reverberation from speech signals” by Allen, Berkley and Blauert (J: Acoust. Soc. Am., Vol. 62, No. 4, October 1977) and out “Noise Suppression Signal Processing Using 2-Point Received Signals” by Kaneda and Tohyame (Electronics and Communication in Japan, Vol. 67-A, No. 12, 1984).
- the first method is intended for the dehalling of speech signals and does not use a real phase compensation of the useful signal and the dehalling with noise reduction is only carried out in a post-processing stage.
- the second method uses a simple linear phase compensation of the channels, but here too the noise is only reduced in the post-processing stage.
- the invention is therefore based on the object of specifying a method for noise reduction in which the noise reduction is carried out in several stages and a significant improvement in the speech quality is achieved.
- the microphone signals x and y are transformed into the frequency range (FFT, Fast Fourier Transformation).
- the segments are half overlapped and weighted with a Hanning window.
- the segments are each N values long and are expanded by an additional N zeros.
- the transformed segments X l (i) and Y l (i) result.
- the output signal z results after inverse transformation and the overlap of the segments.
- the sampling rate of the signals x and y is, for example, 12 kHz.
- the long-term mean of the magnitude spectrum is subtracted (spectral subtraction H SPS ).
- the short-term average K and the long-term average L are used to calculate a first adaptive smoothing constant ⁇ .
- the interference spectrum S nn (i) is estimated with ⁇ .
- This adaptive smoothing constant replaces the otherwise common speech pause detector.
- S ⁇ xx, l ( i ) (1 - ⁇ l ) S ⁇ xx, l - 1 ( i ) + ⁇ l
- Part of the background noise is allowed to create a natural auditory impression and to mask part of the "musical tones".
- a second adaptive smoothing with ⁇ is used to reduce a further part of the "musical tones" by smoothing the power density S xx little during speech and strongly smoothing during pause.
- the method specified in the unpublished patent application P 42 43 831 is used to calculate the linear phase shift between useful parts in the channels. This method fits seamlessly into the noise reduction method according to the invention.
- the phase shift is estimated from a selected number of the maximums of the cross power density and the phase correction is achieved by multiplication in the frequency domain with the all-pass function H ALLP .
- X ⁇ l ( i ): X ⁇ l ( i )H ALLP
- l X ⁇ l ( i ): X ⁇ l ( i ) (cos ( i * ⁇ ) + j sin ( i * ⁇ ))
- phase correction is carried out for the other channel.
- the first channel serves as a reference.
- the directional filters for the channels are calculated using a "beamforming process". Various cases can be considered as noise. Different directional filters H R result depending on the noise situation . A set of these filters is selected, however, if the system status is known in later operation, it is possible to switch to a specific set or the filters can be continuously adapted.
- the "Beamforming method” is the Frost gradient method ("An Algorithm for Linearly Constrained Adaptive Array Processing" Proc. IEEE, Vol. 60, No. 8, 1972) or according to Sondhi and Elko ("Adaptive Optimization of Microphone Arrays under a Nonlinear Contraint” Int. Conf. on ASSP, Tokyo, 1096, pp. 981-984).
- the method according to the invention is not limited to systems with two channels, but can be used for multi-channel systems (3 and more channels).
Landscapes
- Engineering & Computer Science (AREA)
- Computational Linguistics (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4307688A DE4307688A1 (de) | 1993-03-11 | 1993-03-11 | Verfahren zur Geräuschreduktion für gestörte Sprachkanäle |
DE4307688 | 1993-03-11 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0615226A2 true EP0615226A2 (fr) | 1994-09-14 |
EP0615226A3 EP0615226A3 (en) | 1995-08-23 |
EP0615226B1 EP0615226B1 (fr) | 1999-05-06 |
Family
ID=6482502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94102963A Expired - Lifetime EP0615226B1 (fr) | 1993-03-11 | 1994-02-28 | Procédé de réduction de bruit pour canaux de parole perturbés |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0615226B1 (fr) |
DE (2) | DE4307688A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998003965A1 (fr) * | 1996-07-19 | 1998-01-29 | Daimler-Benz Ag | Procede pour reduire les parasites dans un signal vocal |
EP1251493A2 (fr) * | 2001-04-14 | 2002-10-23 | DaimlerChrysler AG | Procédé pour la réduction du bruit avec fréquence parasite auto-adaptative |
EP1286333A1 (fr) * | 2001-08-21 | 2003-02-26 | Culturecom Technology (Macau) Ltd. | Procédé et dispositif de traitements d'un signal de son |
US11741973B2 (en) | 2015-03-09 | 2023-08-29 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Audio encoder for encoding a multichannel signal and audio decoder for decoding an encoded audio signal |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19942868A1 (de) * | 1999-09-08 | 2001-03-15 | Volkswagen Ag | Verfahren zum Betrieb einer Mehrfachmikrofonanordnung in einem Kraftfahrzeug sowie Mehrfachmikrofonanordnung selbst |
DE19955156A1 (de) * | 1999-11-17 | 2001-06-21 | Univ Karlsruhe | Verfahren und Vorrichtung zur Unterdrückung eines Störsignalanteils im Ausgangssignal eines Schallwandlermittels |
DE10120231A1 (de) * | 2001-04-19 | 2002-10-24 | Deutsche Telekom Ag | Verfahren und Anordnung zur einkanaligen Geräuschreduktion für gestörte Sprachsignale |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4112430A (en) * | 1977-06-01 | 1978-09-05 | The United States Of America As Represented By The Secretary Of The Navy | Beamformer for wideband signals |
US4653102A (en) * | 1985-11-05 | 1987-03-24 | Position Orientation Systems | Directional microphone system |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4066842A (en) * | 1977-04-27 | 1978-01-03 | Bell Telephone Laboratories, Incorporated | Method and apparatus for cancelling room reverberation and noise pickup |
JPS5715597A (en) * | 1980-07-02 | 1982-01-26 | Nippon Gakki Seizo Kk | Microphone device |
US4811404A (en) * | 1987-10-01 | 1989-03-07 | Motorola, Inc. | Noise suppression system |
JPH01118900A (ja) * | 1987-11-01 | 1989-05-11 | Ricoh Co Ltd | 雑音抑圧装置 |
DE4012349A1 (de) * | 1989-04-19 | 1990-10-25 | Ricoh Kk | Einrichtung zum beseitigen von geraeuschen |
GB8911153D0 (en) * | 1989-05-16 | 1989-09-20 | Smiths Industries Plc | Speech recognition apparatus and methods |
US5267323A (en) * | 1989-12-29 | 1993-11-30 | Pioneer Electronic Corporation | Voice-operated remote control system |
DE4106405C2 (de) * | 1990-03-23 | 1996-02-29 | Ricoh Kk | Geräuschunterdrückungseinrichtung für ein Spracherkennungsystem |
-
1993
- 1993-03-11 DE DE4307688A patent/DE4307688A1/de not_active Withdrawn
-
1994
- 1994-02-28 EP EP94102963A patent/EP0615226B1/fr not_active Expired - Lifetime
- 1994-02-28 DE DE59408194T patent/DE59408194D1/de not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4112430A (en) * | 1977-06-01 | 1978-09-05 | The United States Of America As Represented By The Secretary Of The Navy | Beamformer for wideband signals |
US4653102A (en) * | 1985-11-05 | 1987-03-24 | Position Orientation Systems | Directional microphone system |
Non-Patent Citations (2)
Title |
---|
INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING 1991, Bd. 5, 14.Mai 1991 - 17.Mai 1991 TORONTO, CA, Seiten 3581-3584, KELLERMANN 'A self-steering digital microphone array' * |
SIGNAL PROCESSING VI - THEORIES AND APPLICATIONS. PROCEEDINGS OF EUSIPCO-92, SIXTH EUROPEAN SIGNAL PROCESSING CONFERENCE, 24.August 1992 - 27.August 1992 BRUSSELS, BE, Seiten 1633-1636, LE BOUQUIN ET AL. 'Study of a noise cancellation system based on the coherence function' * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1998003965A1 (fr) * | 1996-07-19 | 1998-01-29 | Daimler-Benz Ag | Procede pour reduire les parasites dans un signal vocal |
US6687669B1 (en) | 1996-07-19 | 2004-02-03 | Schroegmeier Peter | Method of reducing voice signal interference |
EP1251493A2 (fr) * | 2001-04-14 | 2002-10-23 | DaimlerChrysler AG | Procédé pour la réduction du bruit avec fréquence parasite auto-adaptative |
EP1251493A3 (fr) * | 2001-04-14 | 2003-11-19 | DaimlerChrysler AG | Procédé pour la réduction du bruit avec fréquence parasite auto-adaptative |
US7020291B2 (en) | 2001-04-14 | 2006-03-28 | Harman Becker Automotive Systems Gmbh | Noise reduction method with self-controlling interference frequency |
EP1286333A1 (fr) * | 2001-08-21 | 2003-02-26 | Culturecom Technology (Macau) Ltd. | Procédé et dispositif de traitements d'un signal de son |
US11741973B2 (en) | 2015-03-09 | 2023-08-29 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Audio encoder for encoding a multichannel signal and audio decoder for decoding an encoded audio signal |
US11881225B2 (en) | 2015-03-09 | 2024-01-23 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Audio encoder for encoding a multichannel signal and audio decoder for decoding an encoded audio signal |
Also Published As
Publication number | Publication date |
---|---|
DE4307688A1 (de) | 1994-09-15 |
EP0615226B1 (fr) | 1999-05-06 |
EP0615226A3 (en) | 1995-08-23 |
DE59408194D1 (de) | 1999-06-10 |
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