EP1451813A1 - Verfahren zur unterdrückung von umgebungsgeräuschen bei einer freisprecheinrichtung sowie freisprecheinrichtung - Google Patents
Verfahren zur unterdrückung von umgebungsgeräuschen bei einer freisprecheinrichtung sowie freisprecheinrichtungInfo
- Publication number
- EP1451813A1 EP1451813A1 EP02795098A EP02795098A EP1451813A1 EP 1451813 A1 EP1451813 A1 EP 1451813A1 EP 02795098 A EP02795098 A EP 02795098A EP 02795098 A EP02795098 A EP 02795098A EP 1451813 A1 EP1451813 A1 EP 1451813A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power density
- spectral
- fourier transform
- input
- output
- 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 description 19
- 230000003595 spectral effect Effects 0.000 claims abstract description 61
- 230000009466 transformation Effects 0.000 claims abstract description 23
- 230000005236 sound signal Effects 0.000 claims abstract description 5
- 230000003044 adaptive effect Effects 0.000 claims description 21
- 238000012935 Averaging Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 abstract 4
- 230000006870 function Effects 0.000 description 12
- 230000002596 correlated effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
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
- G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal
-
- 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
- G10L2021/02168—Noise filtering characterised by the method used for estimating noise the estimation exclusively taking place during speech pauses
Definitions
- the invention relates to a method for suppressing ambient noise in a hands-free device with two microphones arranged at a predeterminable distance from one another.
- the invention further relates to a hands-free device with two m spaced microphones.
- ambient noise is a strong disturbing factor that can significantly impair speech intelligibility.
- Car telephones are equipped with hands-free devices so that the driver can concentrate fully on driving and driving.
- particularly loud and disturbing ambient noises occur in a vehicle.
- the hands-free device is equipped with two microphones which are arranged at a predeterminable distance from one another.
- the distance between the speaker and the microphones is selected to be smaller than the so-called Hall radius, so that the direct sound components of the speaker at the location of the microphones dominate over the reflection components occurring in the room.
- the sum and difference signals are formed from the microphone signals supplied by the microphones, from which the Fourier transform of the sum signal and the Fourier transform of the difference signal are formed by means of one Fourier transformer each.
- the speech pauses are e.g. B. detected by the fact that their average short-term powers are determined.
- the short-term power of the sum and difference signals are approximately the same, because with uncorrelated signal components it does not matter whether they are added or subtracted before the power calculation, while at the start of the speech, due to the strongly correlated voice component, the short-term power in the summation signal counters - increases significantly above the short-term power in the differential signal. This increase can be easily detected and used for the reliable detection of a speech pause. A pause in speech can therefore be detected with great certainty even in the presence of loud ambient noises.
- the method according to the invention further provides for determining the spectral power density from the Fourier transform of the sum signal and from the Fourier transform of the difference signal, from which the transfer function for an adaptive transformation filter is calculated.
- This adaptive transformation filter generates the interference power density by multiplying the power density of the Fourier transform of the difference signal by its transfer function.
- the transfer function of an also adaptive spectral subtraction filter is calculated from the spectral power density of the Fourier transform of the sum signal and from the interference power density generated by the adaptive transformation filter inverse Fourier transformers is transformed back into the time domain. At the output of this inverse Fourier transformer, a largely free audio or speech signal in the time domain and processed further.
- the output of a first microphone M1 is connected to the first input of an adder AD and the first input of a subtractor SU, while the output of a second microphone M2 is connected to the second input of the adder AD and the second input of the subtractor SU.
- the output of the adder AD is connected to the input of a first Fourier transformer F1, the output of which is connected to the first input of a speech pause detector P, the input of a first arithmetic unit LS for calculating the spectral power density S rr of the Fourier transform R (f) of the sum signal S and Input of an adaptive spectral subtraction filter SF is connected.
- the output of the subtractor SU is connected to the input of a second Fourier transformer F2, the output of which is connected to the second input of the speech pause detector P and to the input of a second computing unit LD for calculating the spectral power density S DD of the Fourier transform D (f) of the difference signal D.
- the output of the first arithmetic unit LS is connected to a third arithmetic unit for calculating the transfer function of an adaptive transformation filter TF and to the first control input of the adaptive spectral subtraction filter SF, the output of which is connected to the input of an inverse Fourier transformer IF.
- the output of the second arithmetic unit LD is connected to the third arithmetic unit R and the input of the adaptive transformation filter TF, the output of which is connected to the second control input of the adaptive spectral subtraction filter SF.
- the output of the speech pause detector P is also connected to the third computing unit R, the output of which is connected to the control input of the adaptive transformation filter TF.
- the two microphones M1 and M2 are arranged at a distance from the speaker which is smaller than the so-called Hall radius. ' For this reason, the direct sound components of the speaker at the location of the microphones dominate over those in a closed room, e.g. B. the interior of a vehicle, occurring reflection components.
- the sum signal S of the microphone signals MSI and MS2 of the two microphones Ml and M2 is formed in the adder AD, while the difference signal D of the microphone signals MSI and MS2 is formed in the subtractor SU.
- the first Fourier transformer F1 forms the Fourier transform R (f) of the sum signal S.
- the second Fourier transformer F2 forms the Fourier transform D (f) of the difference signal D.
- the short-term power of the Fourier transform R (f) of the sum signal S and the Fourier transform D (f) of the difference signal D is determined in the speech pause detector P.
- the two short-term powers hardly differ from each other because it does not matter for uncorrelated signal components whether they are added or subtracted before the power calculation.
- the short-term power in the sum signal rises significantly compared to the short-term power in the difference signal due to the strongly correlated speech component. This increase therefore indicates the end of a language break and the beginning of language.
- the first arithmetic unit LS calculates the spectral power density S rr of the Fourier transform R (f) of the sum signal S by averaging over time.
- the second arithmetic unit LD also calculates the spectral power density S DD of the Fourier transform D (f) of the differential signal D.
- an additional temporal averaging, ie smoothing - the coefficients of the transfer function obtained in this way significantly improves the suppression of ambient noise because the occurrence of so-called artifacts, which are often also referred to as “musical tones”, is prevented.
- the spectral power density S rr (f) is obtained by time averaging from the Fourier transform R (f) of the sum signal S, while in the same way the spectral power density S DD (f) is obtained by time averaging from the Fourier transform D (f) of the difference signal D is calculated.
- the spectral power density S rr is calculated using the following formula (2):
- the calculation of the remaining spectral power densities, which are required for carrying out the method according to the invention, is preferably carried out in the same way.
- the adaptive transformation filter TF uses its transfer function to generate H ⁇ (f) from the spectral power density S DD (f) - of the Fourier transformed D (f) the interference power density S n - j according to the following formula (4):
- the transfer function H BUb of the spectral subtraction filter SF is calculated according to the following regulation (5) calculated:
- H sub (f) b for 1-a * S ⁇ (f) / S rr (f) ⁇ b
- the parameter a represents the so-called here. Overestimation factor, while the so-called b. "Spectral floor '" represents.
- the interference components picked up by the microphones M1 and M2, which hit the microphones M1 and M2 as diffuse sound waves, can be regarded as almost uncorrelated for almost the entire frequency band of interest.
- the two microphones M1 and M2 there is still a certain correlation at low frequencies, which leads to the interference components contained in the reference signal appearing to be somewhat high-pass filtered. So that a misjudgment of the low-frequency interference components in the spectral subtraction is avoided, the low-frequency components of the reference signal are spectrally raised with the aid of the adaptive transformation filter TF shown in the figure.
- the method according to the invention and the hands-free circuit according to the invention which are particularly suitable for a car telephone, are distinguished by excellent speech quality and speech intelligibility, because the estimated value for the interference power density Snn is independent of the speech activity is constantly updated.
- the transfer function of the spectral subtraction filter SF is constantly updated, both during speech activity and during speech pauses. As already mentioned, speech pauses are reliably and precisely detected, which is necessary for updating the transformation filter TF.
- the audio signal at the output of the spectral subtraction filter SF which is largely free of ambient noise, is fed to an inverse Fourier transformer IF, which transforms the audio signal back into the time domain.
- a audio signal AD adder transformed back into the time domain
- R third arithmetic unit for calculating the transfer function of the transformation filter
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Quality & Reliability (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Computational Linguistics (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Telephone Function (AREA)
- Circuit For Audible Band Transducer (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10159281 | 2001-12-04 | ||
| DE10159281A DE10159281C2 (de) | 2001-12-04 | 2001-12-04 | Verfahren zur Unterdrückung von Umgebungsgeräuschen bei einer Freisprecheinrichtung sowie Freisprecheinrichtung |
| PCT/EP2002/013742 WO2003049082A1 (de) | 2001-12-04 | 2002-12-04 | Verfahren zur unterdrückung von umgebungsgeräuschen bei einer freisprecheinrichtung sowie freisprecheinrichtung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1451813A1 true EP1451813A1 (de) | 2004-09-01 |
| EP1451813B1 EP1451813B1 (de) | 2011-03-16 |
Family
ID=7707848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP02795098A Expired - Lifetime EP1451813B1 (de) | 2001-12-04 | 2002-12-04 | Verfahren zur unterdrückung von umgebungsgeräuschen bei einer freisprecheinrichtung sowie freisprecheinrichtung |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1451813B1 (de) |
| AT (1) | ATE502378T1 (de) |
| AU (1) | AU2002360959A1 (de) |
| DE (2) | DE10159281C2 (de) |
| WO (1) | WO2003049082A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10311587A1 (de) * | 2003-03-14 | 2004-09-23 | Volkswagen Ag | Verfahren und Vorrichtung zum Freisprechen in einem Kraftfahrzeug |
| US7162212B2 (en) | 2003-09-22 | 2007-01-09 | Agere Systems Inc. | System and method for obscuring unwanted ambient noise and handset and central office equipment incorporating the same |
| CN113257282B (zh) * | 2021-07-15 | 2021-10-08 | 成都时识科技有限公司 | 语音情感识别方法、装置、电子设备以及存储介质 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19818608C2 (de) * | 1998-04-20 | 2000-06-15 | Deutsche Telekom Ag | Verfahren und Vorrichtung zur Sprachdetektion und Geräuschparameterschätzung |
-
2001
- 2001-12-04 DE DE10159281A patent/DE10159281C2/de not_active Expired - Fee Related
-
2002
- 2002-12-04 WO PCT/EP2002/013742 patent/WO2003049082A1/de not_active Ceased
- 2002-12-04 AT AT02795098T patent/ATE502378T1/de active
- 2002-12-04 DE DE50214964T patent/DE50214964D1/de not_active Expired - Lifetime
- 2002-12-04 EP EP02795098A patent/EP1451813B1/de not_active Expired - Lifetime
- 2002-12-04 AU AU2002360959A patent/AU2002360959A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO03049082A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2002360959A1 (en) | 2003-06-17 |
| ATE502378T1 (de) | 2011-04-15 |
| DE10159281C2 (de) | 2003-09-25 |
| DE50214964D1 (de) | 2011-04-28 |
| EP1451813B1 (de) | 2011-03-16 |
| DE10159281A1 (de) | 2003-06-18 |
| WO2003049082A1 (de) | 2003-06-12 |
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