WO2005046076A1 - エコー抑圧装置 - Google Patents
エコー抑圧装置 Download PDFInfo
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- WO2005046076A1 WO2005046076A1 PCT/JP2003/014329 JP0314329W WO2005046076A1 WO 2005046076 A1 WO2005046076 A1 WO 2005046076A1 JP 0314329 W JP0314329 W JP 0314329W WO 2005046076 A1 WO2005046076 A1 WO 2005046076A1
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- echo
- signal
- band
- ratio
- component
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
- H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
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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
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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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
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the present invention relates to an echo suppressor for reducing an acoustic echo generated when a received signal output from a speaker is input to a microphone via an echo path.
- the mobile phone-teleconference device is equipped with an echo suppression device for the purpose of canceling the acoustic / line echo generated in the communication line.
- a typical echo suppression device is composed of an adaptive filter that cancels echo components, an echo canceller that suppresses residual echo components, and a pseudo background noise adder that superimposes pseudo background noise on the residual echo suppression section. ing.
- the adaptive filter partially cancels the echo from the input signal mixed with the echo signal, but the adaptive filter cannot completely cancel the echo, so it remains in the signal after echo cancellation.
- An echo component is included.
- the echo canceller suppresses the signal containing the residual echo component and outputs the signal after echo suppression.
- the echo suppressor suppresses the background noise as well as the echo, so that the background noise of the transmission signal is partially cut off, resulting in unnaturalness.
- the pseudo-background noise adder generates pseudo-background noise by praying for the background noise of the signal before echo suppression, and adds the pseudo-background noise to the signal output from the echo sub-lesser.
- the echo is small and natural Higher voice is transmitted to the far end.
- ⁇ 'NLP Nonar Processor
- a sensor that is an example of the NLP is a signal that falls below a predetermined threshold. There is an effect s that blocks the sound of the level.
- a center clipper with a fixed input / output characteristic requires a certain level of the transmitted signal even when it can be reliably predicted that no echo is present in the transmitted signal, such as during single talk on the receiving side. If the value is less than the threshold value, the suppression is performed, and the effect of suppression on components other than echo is large.
- Patent Document 1 Japanese Patent Publication No. 9-1 2 7 5 3 6 7
- Patent Document 2 Japanese Patent Application Laid-Open No. 2000-130386
- the conventional echo suppressor is configured as described above, so that the background noise of the transmission signal is partially cut off. Although unnaturalness can be eliminated, the boundaries of the voiced sections of the user's voice cannot be accurately determined, and part of the voice component is impaired by the echo suppression processing by NLP. There were problems such as a deterioration in call quality due to a sense of interruption.
- the present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide an echo suppressor capable of suppressing a residual echo without deteriorating speech quality. Disclosure of the invention
- the echo suppressor according to the present invention is provided with a ratio estimating unit that divides the transmission signal after the subtraction processing by the echo canceller into bands, and estimates a ratio of the echo component to the signal component of each band, and the ratio estimating unit estimates the ratio.
- the amount of echo suppression for each band is calculated from the ratio of the echo components, and the amount of echo suppression is subtracted from the signal components of each band.
- FIG. 1 is a configuration diagram showing an echo suppressor according to Embodiment 1 of the present invention.
- FIG. 2 is a flow chart showing the processing contents of the suppression band determination unit.
- FIG. 3 is a graph showing an example of setting a determination threshold.
- FIG. 4 is an explanatory diagram showing a method of calculating the amount of echo suppression.
- FIG. 5 is an explanatory diagram showing the result of echo suppression.
- FIG. 6 is a configuration diagram showing an echo suppression device according to Embodiment 2 of the present invention. '.
- FIG. 1 is a configuration diagram showing an echo suppressor according to Embodiment 1 of the present invention.
- the echo suppressor includes an echo canceller 1 and an echo suppressor 2.
- the adaptive filter 11 of the echo canceller 1 generates a pseudo echo signal d (t) from the received signal r (t), and the subtractor 12 of the echo canceller 1 generates the pseudo echo signal d (t) from the transmission signal s (t). ) Is subtracted to perform echo cancellation, and the transmission signal u (t) after echo cancellation is output.
- the suppression band determination unit 25 refers to the estimation results of the signal-to-echo ratio estimation unit 23 and the subband signal-to-echo ratio estimation unit 24, and determines the subband to be suppressed.
- the noise spectrum estimator 26 estimates the background noise spectrum N f (j) from the Fourier spectrum U (j) output from the FFT processor 21 and obtains the background noise spectrum N f
- the background noise level N s (n) is calculated from (j).
- the sub-band power calculation unit 27 calculates a transmission signal power -U s (n) of each sub-band from the Fourier spectrum U (j) output from the FFT processing unit 21.
- the echo suppression amount calculation unit 28 has a background noise level N
- the subband echo suppression amount eg (n) determined by the suppression band determination unit 25 is calculated from s (n) and the transmission signal power Us (n).
- the echo suppression processor 29 subtracts the echo suppression amount eg (n) calculated by the echo suppression calculator 28 from the Fourier vector U (j) output from the FFT processor 21. Perform processing.
- an echo suppression means is composed of a suppression band determination unit 25, a noise spectrum estimation unit 26, a subband power calculation unit 27, an echo suppression amount calculation unit 28, and an echo suppression processing unit 29. .
- IFFT processing section 30 performs IFFT (inverse fast Fourier transform) processing on transmission signal spectrum 0 (j) after the suppression processing by echo suppression processing section 29, and outputs transmission signal 0 (t), which is a time-series signal. This composes a band combining means.
- the subtractor 12 of the echo canceller 1 receives the pseudo echo signal d (t) from the adaptive filter 11 1.
- the transmission signal s (t) in which the echo is superimposed on the user voice including the background noise Then, the pseudo echo signal d (t) is subtracted from Eq.
- the transmission signal u (t) after echo cancellation is output to the echo suppression unit 2.
- the FFT processing unit 21 of the echo suppression unit 2 When receiving the transmission signal u (t) after echo cancellation from the echo canceller 1, the FFT processing unit 21 of the echo suppression unit 2 performs FFT processing on the transmission signal u (t) after echo cancellation, The transmission signal u (t) after echo cancellation is divided into bands, and the Fourier spectrum U (j) is output.
- j is an index that represents the frequency.
- the FFT processing unit 22 of the echo suppression unit 2 subjects the transmission signal s (t) before echo cancellation to FFT processing, thereby dividing the transmission signal s (t) before echo cancellation into bands, and Output the torque S (j).
- the signal-to-echo ratio estimating unit 23 receives the Fourier spectrum U (j) from the FFT processing unit 21 and receives the Fourier spectrum S (j) from the FFT processing unit 22. ), S (j), the ratio of the echo component to the total signal component of the transmission signal s (t) before echo cancellation is estimated. That is, the ratio SER t between the transmission signal S (t) before the echo cancellation and the echo component included in the transmission signal S (t). Estimate ta i as shown below. sER total (1)
- the subband signal-to-echo ratio estimator 24 receives the Fourier spectrum U (j) from the FFT processor 21 and the Fourier spectrum S (j) from the FFT processor 22, From the Fourier spectra U (j) and S (j), the ratio of the echo component to the signal component of each subband is estimated. That is, the ratio S ER (n) between the signal component of each subband and the echo component of each subband in the transmission signal s (t) before echo cancellation is estimated as shown below.
- n is an index indicating the subband number
- li (n) represents the start point on the frequency axis: i of the nth subband
- 1 2 (n) represents the end point.
- Equation (3) is an equation for calculating the ratio of the echo component as the ratio of the power spectrum.
- the ratio of the echo component may be estimated by comparing the pseudo echo signal d (t) generated by the adaptive filter 11 with the transmission signal u (t) after the echo cancellation.
- the signal input to the FFT processing unit 22 is not the transmission signal s (t) before echo cancellation, but a pseudo echo signal d (t) generated by the adaptive filter 11 and
- the signal output from the FFT processing unit 22 is the Fourier spectrum D (j) of the pseudo echo single signal d (t).
- the ratio of the echo component contained in the transmission signal s (t) is estimated by the following equation (4).
- FIG. 2 is a flowchart showing the processing contents of the suppression band determination unit.
- the suppression band determination unit 25 determines that the ratio of the echo component contained in the entire transmission signal is low and the effect of the residual echo is small.
- the suppression band determination unit 25 may set the variable ⁇ representing the subband to “0” because the proportion of the echo component contained in some of the subbands may be high.
- the subband signal-to-echo ratio estimator 24 (compares the estimated ratio SER ( ⁇ ) with the subband suppression determination threshold TH R_S ER (n), It is determined whether the following equation (8) is satisfied (step ST6).
- the suppression band determination unit 25 determines that the subband n is a target of suppression because the ratio of the echo component included in the subband n is high. Set n) to "1" (step ST7).
- the suppression band determination unit 25 increments the variable n by "1" (step ST9), and repeatedly executes the processing of steps ST5 to ST10 until n ⁇ M is satisfied. I do.
- the subband suppression determination threshold value TH R_S E (n) used in step ST6 may be set to a unique value for all n, but may be determined according to the echo canceling capability of the echo canceller 1. Then, individual values may be determined for each n.
- the noise spectrum estimating section 26 calculates the background noise spectrum Nf (j) from the Fourier spectrum U (j). And estimate the background noise spectrum N f ( Calculate the background noise level N s (n) from j).
- the method of estimating the background noise spectrum N f (j) the method of calculating the average noise spectrum described in Japanese Patent Application Publication No. 2000-347678 is cited.
- the subband power calculation section 27 When receiving the Fourier spectrum U (j) from the FFT processing section 21, the subband power calculation section 27 substitutes the Fourier spectrum U (j) into the following equation (10), and calculates the subband power of each subband. Calculate the transmission signal power U s (n).
- the echo suppression amount calculation unit 28, the noise spectrum estimation unit 26 calculates the background noise level N s (n), and the subband power calculation unit 27 calculates the transmission signal power U s ( n), the background noise level N s (n) and the transmission signal power U s (n) of each subband are substituted into the following equation (11), and the value is determined by the suppression band determination unit 25. Calculate the echo suppression amount eg (n) of the subband to be suppressed.
- the amount of suppression calculated by the echo suppression amount calculation unit 28 is, as shown in Fig. 4, It is calculated as an amount that suppresses the transmission signal in the band to be suppressed to the background noise level N s (n) estimated by the noise spectrum estimator 26.
- the echo suppression calculating unit 28 calculates the echo suppression amount eg (n) of the sub-band to be suppressed, the echo suppression amount eg Substitute (n) into the following equation (12) to perform echo suppression processing, and output the transmitted signal spectrum 0 (j) after echo suppression.
- the signal components in the band where the proportion of the echo components is high are suppressed to the background noise level as shown in FIG.
- the transmission signal spectrum ((j) after the suppression processing has a shape almost similar to the background noise spectrum.
- the IFFT processing unit 30 performs IFFT processing on the transmission signal spectrum 0 (j) after the suppression processing, and transmits the transmission signal 0 (t) as a time-series signal. ) Is output.
- the transmission signal u (t) after echo cancellation by the echo canceller 1 is divided into bands, and the ratio of the echo component to the signal component in each band is estimated.
- a ratio estimator is provided, and the echo suppression amount eg (n) for each band is calculated from the ratio of the echo components estimated by the ratio estimator, and the echo suppression amount eg (n) is subtracted from the signal components of each band.
- the suppression processing is performed by selecting only the band having a high proportion of the echo component, the user voice component included in the transmission signal, particularly the beginning and end portions, is not lost, and the speech quality is maintained. This has the effect of suppressing the residual echo.
- the ratio of the echo component included in the entire transmission signal is checked, and in a time section where the ratio of the echo component is particularly high, the entire band is determined as a target to be suppressed and the suppression process is performed. So the receiver's thing A high suppression effect can be obtained during talk.
- the signal components of each subband are suppressed to the background noise level, and the suppression beyond the background noise level is not performed. This has the effect of suppressing the echo.
- the effect that the calculation scale can be simplified can be achieved.
- the transmission signal u (t) after the echo cancellation by the echo canceller 1 is referred to, so that the calculation scale is relatively small. This has the effect of realizing high estimation accuracy.
- FIG. 6 is a configuration diagram showing an echo suppressing apparatus according to Embodiment 2 of the present invention.
- the same reference numerals as those in FIG. 1 denote the same or corresponding parts, and a description thereof will be omitted.
- the subband signal-to-echo ratio estimator 35 calculates each subband from the echo coupling amount L (n) for each subband estimated by the echo coupling amount estimator 33. The ratio of the echo component to the signal component of is estimated.
- the FFT processing units 31 and 32, the echo coupling amount estimation unit 33, the signal-to-echo ratio estimation unit 34, and the subband signal-to-echo ratio estimation unit 35 constitute a ratio estimation unit.
- the transmission signal s (t) before the echo cancellation by the echo canceller 1 is compared with the transmission signal u. (T) after the echo cancellation, or the pseudo echo generated by the adaptive filter 11 is compared.
- the signal d (t) is compared with the transmitted signal u (t) after echo cancellation to estimate the proportion of the echo component contained in the transmitted signal s (t).
- the transmitted signal s (t) to estimate the amount of echo coupling in the echo path, and estimate the proportion of the echo component contained in the transmitted signal s (t) from the amount of echo coupling. Is also good.
- the FFT processing section 31 subjects the received signal r (t) to FFT processing and outputs a Fourier spectrum R (j).
- the FFT processing unit 32 subjects the transmission signal s (t) to FFT processing and outputs a Fourier spectrum S (j).
- the echo coupling amount estimating unit 33 receives the Fourier spectrum R (j) from the FFT processing unit 31 and receives the Fourier spectrum S (j) from the FFT processing unit 32, and receives the Fourier spectrum R (j). j) and S (j), the total amount of Eco-coupling L t . to estimate the ta i and subband another echo coupling amount L (n) O
- the echo-coupling-amount estimating unit 33 compares the total signal power of the transmission signal s (t) with the total signal power of the reception signal r (t). Judgment is made by the following equation (13) (step ST21 in FIG. 7).
- T HR-RST is a threshold for determining whether or not the current call state is a single talk on the receiving side.
- the echo coupling amount estimating unit 33 calculates the total echo coupling amount L t when Expression (13) is satisfied. tal is updated as follows (step ST22).
- ⁇ is a coefficient that determines the update speed, and is a constant that satisfies 0 ⁇ ⁇ 1.
- L, t . tal is Ri echo coupling amount der of the pre-update total, Eco-over amount of binding L t. It is assumed that the initial value of ta1 is set to a value that is sufficiently smaller than the actual amount of echo coupling in the application target of the echo suppression device.
- the echo coupling amount estimating unit 33 updates the echo coupling amount L (n) for each subband as follows (step ST23). Net (1 5)
- the initial value of the amount of echo coupling L (n) is also assumed to be set to a value that is sufficiently smaller than the actual amount of echo coupling in the target to which the echo suppressor is applied.
- the echo coupling amount estimation unit 33 Do not update the total amount.
- the signal-to-echo ratio estimating unit 34 calculates the total echo coupling amount L t by the echo coupling amount estimating unit 33.
- ta ⁇ the total amount of echo coupling L t .
- S ER t as a percentage of the echo component against the total signal component of the transmission signal s (t).
- the subband signal-to-echo ratio estimator 35 calculates the echo coupling amount L (n) for each subband when the echo coupling amount estimating unit 33 estimates the echo coupling amount L (n) for each subband.
- SER (n) is estimated as the ratio of one echo component to the signal component of each subband by substituting into equation (17).
- n 1, 2, ⁇ ⁇ ⁇ , ⁇
- the details of the processing from the suppression band determination unit 25 to the IF F ⁇ processing unit 30 are the same as in the first embodiment, and a description thereof will be omitted.
- the second embodiment even when the echo canceller 1 based on the adaptive filter 11 does not exist before the echo suppressor or when the echo canceller 1 is simply connected in series, As in the first embodiment, it is possible to suppress the residual echo without deteriorating the communication quality.
- the amount of coupling in the echo path is estimated from the received signal r (t) and the transmitted signal s (t), and the amount of coupling is multiplied by the band division signal of the received signal. Since the ratio of the echo component to the signal component in each band is estimated by comparing with the band-divided signal, there is no echo canceller 1 with the adaptive filter 11 in the previous stage of the echo suppressor. In this case, the effect of being able to estimate the ratio of the echo component to the signal component of each band is obtained even when the echo canceller 1 is simply connected in series.
- the coupling amount of the echo path is calculated from the power spectrum between the transmission and reception, the estimation of the coupling amount is based on the power of the input speech on the spectrum. This makes it less likely to be affected by the bias, and has the effect of achieving high estimation accuracy even in the high-frequency side where the signal level is relatively small.
- the echo suppression amount eg (n) of each subband is calculated as a value corresponding to the suppression amount for suppressing from the current transmission signal level to the background noise level.
- the echo suppression amount eg (n) of each subband may be calculated according to the ratio of the echo component to the band signal component.
- the echo suppression amount calculating section 28 calculates the echo suppression amount eg (n) using the following equation (18) instead of the equation (11). sf (n) ax (SER (n)-THR_SER (n) + Ns (n)-Us (n), 0) SER (n) ⁇ THR_SER (n) SER (n, THR SER (n)
- Equation (18) if SER (n) is smaller than threshold value THR—SER (n), a suppression amount having the same value as the suppression amount calculated by equation (11) should be calculated. However, if SER (n) is equal to or greater than the threshold THR-SER (n), the suppression amount eg (n) that is reduced by an amount exceeding the threshold THR-SER (n) is calculated.
- the amount of suppression is adjusted according to the ratio to perform echo suppression.
- the suppression can be performed even under the condition where the suppression cannot be performed, and the effect of suppressing the echo can be enhanced.
- the upper limit of the amount of suppression determined according to the magnitude of the ratio of the echo component is set to a value corresponding to the suppression up to the background noise level.
- the suppression amount eg (n) is determined so that the average signal level of the sub-band to be suppressed is equivalent to the background noise level, and suppression processing of one echo component is performed.
- the suppression processing may be performed so that the amplitude spectrum of the subband to be suppressed is flattened in the subband. That is, in the fourth embodiment, the echo suppression amount is calculated for each sample on the Fourier spectrum, instead of calculating the echo suppression amount for each sub-band.
- I s (n) indicates the number of samples in the Fourier spectrum of subband n.
- FIG. 8 is a configuration diagram showing an echo suppressing apparatus according to Embodiment 5 of the present invention.
- the same reference numerals as in FIG. 1 denote the same or corresponding parts, and a description thereof will be omitted.
- the double-talk detector 41 performs double-talk detection processing, and the echo suppression calculator 42 calculates the echo suppression in the same manner as the echo suppression calculator 28 in FIG.
- the talk detector 41 detects double talk, the echo suppression amount is suppressed in the double talk detection section more than in the non-detection section.
- the double talk detection unit 41 and the echo suppression amount calculation unit 42 constitute an echo suppression unit.
- a double talk that performs double talk detection processing is performed.
- the second embodiment differs from the first embodiment in that an echo suppression unit 41 is provided, and the echo suppression amount calculation unit 42 suppresses the echo suppression amount in the double talk detection section more than in the non-detection section.
- the double talk detecting unit 41 calculates the difference between the power of the transmission signal u (t) 'after the echo cancellation output from the subtractor 12 of the echo canceller 1 and the reception signal r (t), Whether or not this power difference exceeds a predetermined threshold value THR-DT is determined by the following equation (20).
- THR-DT is a threshold for detecting double talk.
- the echo suppression amount calculation unit 42 calculates the echo suppression amount eg (n) in the non-detection section where the double talk detection unit 41 does not detect double talk in the same manner as the echo suppression amount calculation unit 28 in FIG. When the double talk detection unit 41 detects double talk, the echo suppression amount eg (n) is suppressed in the double talk detection section more than in the non-detection section.
- the echo suppression calculating unit 42 calculates the echo suppression e g (n) by substituting the double talk detection flag df into the following equation (21).
- eg (n) (l-df) -sf (n) ⁇ max (Ns (w)-Us (n), 6) (2 1)
- echo suppression in the double talk detection section Although the amount eg (n) becomes zero, 0 ⁇ df ⁇ 1 may be set so that the echo suppression amount eg (n) becomes smaller than the non-detection section.
- the echo suppression amount eg (n) is suppressed in the double talk detection section more than in the non-detection section, so that the degradation of the transmission quality in the double talk section is suppressed. An effect that can be suppressed is exerted.
- the double talk detector 41 detects double talk based on the difference between the power of the transmission signal u (t) after the echo cancellation and the power of the received signal: r (t).
- the method of detection and the parameters for detection are not limited to this. Industrial applicability
- the echo suppressing apparatus needs to improve the communication quality by reducing the acoustic echo generated when the received signal output from the speaker is input to the microphone via the echo path. It is suitable for use in voice communications such as car phones and mobile phones.
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PCT/JP2003/014329 WO2005046076A1 (ja) | 2003-11-11 | 2003-11-11 | エコー抑圧装置 |
EP03818969A EP1684442A4 (en) | 2003-11-11 | 2003-11-11 | ECHO SUPPRESSOR |
JP2005510461A JP4607015B2 (ja) | 2003-11-11 | 2003-11-11 | エコー抑圧装置 |
CN200380108475.2A CN1736039A (zh) | 2003-11-11 | 2003-11-11 | 回波抑制装置 |
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JP2009021741A (ja) * | 2007-07-11 | 2009-01-29 | Yamaha Corp | エコーキャンセラ |
JP2010135936A (ja) * | 2008-12-02 | 2010-06-17 | Hitachi Ltd | エコーキャンセラおよびエコー消去方法 |
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JP2002217793A (ja) * | 2001-01-22 | 2002-08-02 | Matsushita Electric Ind Co Ltd | エコー抑圧装置 |
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US5561668A (en) * | 1995-07-06 | 1996-10-01 | Coherent Communications Systems Corp. | Echo canceler with subband attenuation and noise injection control |
DE19831320A1 (de) * | 1998-07-13 | 2000-01-27 | Ericsson Telefon Ab L M | Digitales adaptives Filter und akustischer Echokompensator |
US6904146B2 (en) * | 2002-05-03 | 2005-06-07 | Acoustic Technology, Inc. | Full duplex echo cancelling circuit |
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- 2003-11-11 JP JP2005510461A patent/JP4607015B2/ja not_active Expired - Fee Related
- 2003-11-11 EP EP03818969A patent/EP1684442A4/en not_active Withdrawn
- 2003-11-11 WO PCT/JP2003/014329 patent/WO2005046076A1/ja active Application Filing
- 2003-11-11 CN CN200380108475.2A patent/CN1736039A/zh active Pending
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JPH1023172A (ja) * | 1996-07-08 | 1998-01-23 | Matsushita Electric Ind Co Ltd | エコー除去装置 |
JPH11331046A (ja) * | 1998-03-16 | 1999-11-30 | Nippon Telegr & Teleph Corp <Ntt> | エコー抑圧方法及び装置並びにエコー抑圧プログラムが記憶されたコンピュータに読取り可能な記憶媒体 |
JP2000224081A (ja) * | 1999-02-04 | 2000-08-11 | Nec Corp | エコーキャンセラ装置 |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007256698A (ja) * | 2006-03-24 | 2007-10-04 | Univ Waseda | 音声の類似度の評価を行う方法および装置 |
JP4490384B2 (ja) * | 2006-03-24 | 2010-06-23 | 学校法人早稲田大学 | 音声の類似度の評価を行う方法および装置 |
JP2009021741A (ja) * | 2007-07-11 | 2009-01-29 | Yamaha Corp | エコーキャンセラ |
JP2010135936A (ja) * | 2008-12-02 | 2010-06-17 | Hitachi Ltd | エコーキャンセラおよびエコー消去方法 |
JP2011024163A (ja) * | 2009-07-21 | 2011-02-03 | Yamaha Corp | エコー抑圧方法およびその装置 |
WO2012070670A1 (ja) * | 2010-11-25 | 2012-05-31 | 日本電気株式会社 | 信号処理装置、信号処理方法、及び信号処理プログラム |
JPWO2012070670A1 (ja) * | 2010-11-25 | 2014-05-19 | 日本電気株式会社 | 信号処理装置、信号処理方法、及び信号処理プログラム |
WO2012153452A1 (ja) * | 2011-05-10 | 2012-11-15 | 三菱電機株式会社 | エコー消去装置およびエコー検出装置 |
JP5501527B2 (ja) * | 2011-05-10 | 2014-05-21 | 三菱電機株式会社 | エコー消去装置およびエコー検出装置 |
US9286881B2 (en) | 2011-05-10 | 2016-03-15 | Mitsubishi Electric Corporation | Echo canceler and echo detector |
Also Published As
Publication number | Publication date |
---|---|
EP1684442A1 (en) | 2006-07-26 |
JPWO2005046076A1 (ja) | 2007-06-14 |
JP4607015B2 (ja) | 2011-01-05 |
CN1736039A (zh) | 2006-02-15 |
EP1684442A4 (en) | 2009-04-15 |
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