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1. 发明专利

JP2012205123A Acoustic echo canceller 审中-公开
标题翻译： ACOUSTIC ECHO CANCELLER
公开(公告)号：JP2012205123A
公开(公告)日：2012-10-22
申请号：JP2011068480
申请日：2011-03-25
申请人： Toshiba Corp , 株式会社東芝
发明人： MINAMI SHIGENOBU
IPC分类号： H04R3/02 , H04B3/23 , H04S1/00
CPC分类号： H04M9/082
摘要： PROBLEM TO BE SOLVED: To provide an acoustic echo canceller capable of efficiently achieving stable echo cancellation capability.SOLUTION: The acoustic echo canceller includes: an audio signal decoding unit 2 for decoding a stereo audio signal using a stereo parameter generated on the basis of correlation between input left and right stereo audio signals; and an acoustic echo cancellation unit 6, including a stereo adaptive filter 62 which estimates an acoustic echo produced by the decoded stereo audio signal, for eliminating the acoustic echo estimated from the input audio signals. The acoustic echo cancellation unit 6 further includes a stereo echo canceller controller 61 for controlling the estimation operation of the acoustic echo in the stereo adaptive filter 62, on the basis of the stereo parameter.
摘要翻译：要解决的问题：提供能够有效地实现稳定的回波消除能力的声学回声消除器。声学回声消除器包括：音频信号解码单元2，用于使用基于输入的左和右立体声音频信号之间的相关性产生的立体声参数来解码立体声音频信号; 和声回波消除单元6，其包括估计由解码的立体声音频信号产生的声学回声的立体声自适应滤波器62，用于消除从输入音频信号估计的声学回声。声回波消除单元6还包括立体声回声消除器控制器61，用于基于立体声参数来控制立体声自适应滤波器62中的声学回声的估计操作。版权所有（C）2013，JPO＆INPIT

2. 发明专利

JPH0954600A VOICE-CODING COMMUNICATION DEVICE 失效
公开(公告)号：JPH0954600A
公开(公告)日：1997-02-25
申请号：JP20715495
申请日：1995-08-14
申请人： TOSHIBA CORP
发明人： TSUKAHARA YURIKO , MINAMI SHIGENOBU
IPC分类号： G10L19/02 , G10L19/04 , H03M1/12 , G10L9/18 , G10L9/14
摘要： PROBLEM TO BE SOLVED: To additionally enhance communication quality in high-noise environment by decreasing the distortions between noise frames and improving a noise characteristic. SOLUTION: This device is provided with a noise level estimating section 13 and a noise power calculating section 15 separately from an encoding section 17 and is provided with a noise LPC estimating section 16. The noise power and noise LPC coeffts. in the past plural noise frames of transmitted speeches are continuously and respectively calculated by these section. The results of the calculation of the noise power and noise LPC coeffts. are supplied to the encoding section 17, by which the results are encoded at the time of encoding the present noise frames in the encoding section 17.

3. 发明专利

JPH0936763A NOISE CANCELLER 失效
公开(公告)号：JPH0936763A
公开(公告)日：1997-02-07
申请号：JP18902395
申请日：1995-07-25
申请人： TOSHIBA CORP
发明人： OBARA TAKASHI , MINAMI SHIGENOBU
IPC分类号： H04M1/00 , H04B1/10
摘要： PROBLEM TO BE SOLVED: To obtain a noise reduction effect corresponding to a noise state at any time by jointly using 1st and 2nd noise elimination means conducting different noise eliminating processing. SOLUTION: A microphone 10 receives a voice signal being an audible tone mainly. A microphone 11 is a sound collection means for noise cancellation. An adaptive filter 14 uses an A/D converter 13 to generate a pseudo noise component. Then a subtractor 15 subtracts a pseudo noise component from an output of a delay circuit 23 to cancel noise. In this case, a tap coefficient of the adaptive filter 14 is properly updated in a direction of decreasing the subtracted signal EX. A cancellation level discrimination device 18 compares outputs of buffers 16, 17 to discriminate whether or not the noise cancellation level exceeds a 1st threshold level. A selector 24 selects any of the output signal EX from the subtractor 15, a discrimination signal from the discrimination device 18 and an output signal from a noise level suppressor 21 depending on a discrimination signal SLF.

4. 发明专利

JPH0738956A MOBILE RADIO COMMUNICATION EQUIPMENT 失效
公开(公告)号：JPH0738956A
公开(公告)日：1995-02-07
申请号：JP17433993
申请日：1993-07-14
申请人： TOSHIBA CORP
发明人： YAMAGUCHI TAKESHI , OGURA KOJI , MINAMI SHIGENOBU
IPC分类号： H04B7/26 , H04B7/08 , H04Q7/38
摘要： PURPOSE:To make the subject equipment simple in equipment configuration, small in size and light in weight while sufficiently reducing the effect of fading. CONSTITUTION:A diversity reception circuit is provided only to a stationary radio section FX1. Then a removal detection section 41 detects a removal state of a portable radio section PS1 with respect to the stationary radio section FX1n and when it is discriminated that the portable radio section PS1 is connected to the stationary radio section FX1, the stationary radio section FX1 side selects changeover switches 23, 26, 29 respectively to connect the space diversity reception circuit provided in the stationary radio section FX1 to the reception system of the portable radio section PS1 thereby making space diversity reception. When it is discriminated that the portable radio section PS1 is used singly, the reception by the reception system of the portable radio section PS1 is made by throwing the changeover switches 23, 26, 29 to the position of the portable radio section PS1.

5. 发明专利

JPH06236200A STEREO SOUND ENCODING/DECODING SYSTEM 失效
公开(公告)号：JPH06236200A
公开(公告)日：1994-08-23
申请号：JP2405193
申请日：1993-02-12
申请人： TOSHIBA CORP
发明人： MINAMI SHIGENOBU , OKADA OSAMU
IPC分类号： G10L19/00 , H04B14/04 , H04N5/60 , H04N7/15 , G10L9/18
摘要： PURPOSE:To prevent a sound image from flickering even at the time of double talk by performing stereo sound transmission at the time of double talk and performing monaural transmission only at the time of a single utterance. CONSTITUTION:By a first monaural sound encoder 101, the sum of the outputs of left and right microphones is compressed and encoded to e.g. 56kbps. By a detector 102, a level difference, a delay difference between the output signals of left and right microphones and the difference between the single utterance and plural simultaneous utterance are detected and encoded to e.g. 8kbps. By second and third monaural sound encoders 103, 104, the output signals of left and right respective microphones are encoded to a bit rate lower than the first monaural sound encoder 101 e.g. 32kbps individually at the time of plural simultaneous utterance. Thus, the stereo sound transmission is performed with high quality and in pesudo by the first monaural sound encoder 101 at the time of the single utterance, and the stereo sound transmission is performed perfectly and left and right individually by the second and third monaural sound encoders 103, 104 at the time of plural simultaneous utterance.

6. 发明专利

JPH06217276A MOVING PICTURE ENCODING DEVICE 失效
公开(公告)号：JPH06217276A
公开(公告)日：1994-08-05
申请号：JP21302693
申请日：1993-08-27
申请人： TOSHIBA CORP
发明人： OKADA OSAMU , MINAMI SHIGENOBU , YAMAZAKI SHOICHIRO
IPC分类号： H04N19/00 , H04N7/14 , H04N19/115 , H04N19/126 , H04N19/132 , H04N19/134 , H04N19/167 , H04N19/172 , H04N19/196 , H04N19/423 , H04N19/587 , H04N19/625 , H04N19/70 , H04N19/80 , H04N19/91 , H04N7/13
摘要： PURPOSE:To provide the moving picture encoding device which can precisely estimate the position of a speaker and clearly display the display area of the speaker. CONSTITUTION:This device consists of a television camera 12 which picks up an image of a subject and generates an image signal, microphones 11L and 11R which gather the voice of the speaker picked up by the television camera 12 and output voice signals, an estimating circuit 13 which estimates the sound source position from the voice signals obtained from those microphones 11L and 11R, and an encoding circuit 15 which encodes the video signal of an image area in a specific range including the sound source position estimated by the estimating circuit 13 in its center by assigning a larger encoding quantity than video signals of other image areas so that the image area in the specific range is higher in resolution than other image areas.

7. 发明专利

JPH03220841A LOW FREQUENCY INTERRUPT DISTORTION EQUALIZER 失效
公开(公告)号：JPH03220841A
公开(公告)日：1991-09-30
申请号：JP1740790
申请日：1990-01-25
申请人： TOSHIBA CORP
发明人： ASANO ATSUSHI , MINAMI SHIGENOBU , YAMAZAKI SHOICHIRO , YAMAGUCHI TAKESHI
IPC分类号： H04L25/03 , H04B3/06
摘要： PURPOSE:To reduce the processing quantity and to converge the distortion in a short time by estimating a cut-off frequency of a low frequency cut-off of a transmission line from an electric distortion of a reception signal subjected from the transmission line and equalizing the low frequency cut-off distortion of the reception signal based on the estimated cut-off frequency. CONSTITUTION:Since the attenuation of a reception signal is increased as the transmission line is longer and the resistance of the transmission line is higher, the amplification factor of a gain control circuit 12 compensating the attenuation of the reception signal is proportional to the resistance of the transmission line. On the other hand, the cut-off frequency of the transmission line is proportional to the resistance of the transmission line. Then a coefficient correction circuit 16 estimates the cut-off frequency of the transmission line based on the amplification factor of the gain control circuit 12 to select a coefficient most suitable for the estimated cut-off frequency among a coefficient table 17 in which plural different coefficients for the cut-off frequencies of a filter 14 are prepared. Thus, since the coefficient of the filter 14 suitable for the cut-off frequency of the transmission line is selected with a simple processing based on the amplification factor of the gain control circuit 12, the distortion is converged in a short time.

8. 发明专利

JPH02238728A LOW BAND INTERRUPTION DISTORTION ELIMINATING SYSTEM 失效
公开(公告)号：JPH02238728A
公开(公告)日：1990-09-21
申请号：JP5930089
申请日：1989-03-10
申请人： TOSHIBA CORP
发明人： YAMAGUCHI TAKESHI , MINAMI SHIGENOBU , YAMAZAKI SHOICHIRO
IPC分类号： H04B3/06
摘要： PURPOSE:To obtain a low band interruption distortion eliminating system with a small error and sufficient performance by employing a FIR filter adopting band split processing, able to be realized at a low cost and whose adaptive system is established in place of a high-order adaptive IIR filter. CONSTITUTION:The system consists of an impulse response estimate section 41, a 1st low band cut-off distortion equalizing section 42 and a 2nd low band cut-off distortion equalizing section 43 and the impulse response estimate section 41 uses a FIR(Finite Impulse Response) adaptive filter 48 realized by the band split processing to estimate an impulse response from a reception signal Y(Z) and a discrimination signal. That is, the FIR adaptive filter 48 with a low cost whose study algorithm is established through the reduced processing quantity by the band split processing is adopted in place of the high-order adaptive IIR filter. Thus, the error is decreased and sufficient performance is obtained.

9. 发明专利

JPH02237214A SYSTEM FOR REMOVING LOW BAND DISTORTION 失效
公开(公告)号：JPH02237214A
公开(公告)日：1990-09-19
申请号：JP5704289
申请日：1989-03-09
申请人： TOSHIBA CORP
发明人： MINAMI SHIGENOBU , YAMAZAKI SHOICHIRO
IPC分类号： H03H17/02 , H03H17/00 , H03H17/04 , H03H17/06 , H03H21/00 , H04B1/10 , H04B3/23
摘要： PURPOSE:To remove low-band interruption distortion and the like in a satisfactory state by inputting a partial band input signal and a partial band output signal, estimating the characteristic of an unknown system by means of an adaptive FIR filter and defining the coefficient of an adaptive llR filter based on the estimated result. CONSTITUTION:A band dividing type adaptive filter 1203 extracts the signal of the partial band of a reception signal from an input signal for the unknown system 1202 which a decision part 1201 deciding the reception signal, and from an unknown system output signal, and generates a partial reception signal and a partial band decision signal. The adaptive FIR filter estimates the characteristic of low-band interruption distortion being the characteristic of the unknown system and defines the coefficient of the adaptive IIR filter 1203 based on the estimated result. Low-band interruption distortion is removed from the reception signal by permitting an unknown system input signal to pass through the adaptive IIR filter 1204. Thus, the coefficient of the adaptive IIR filter 1204 can accurately be estimated and low band interruption distortion included in the reception signal can removed in the satisfactory state.

10. 发明专利

JPS6429154A VOICE CONFERENCE EQUIPMENT 失效
公开(公告)号：JPS6429154A
公开(公告)日：1989-01-31
申请号：JP18517187
申请日：1987-07-24
申请人： NIPPON TELEGRAPH & TELEPHONE , TOSHIBA CORP
发明人： MAKINO SHOJI , KOIZUMI NOBUO , HIDA MIZUHIRO , KUSHIGE NAOHIDE , SAEKI TAKASHI , MINAMI SHIGENOBU
IPC分类号： H04M9/08
摘要： PURPOSE:To progress a conference smoothly by providing a gain control circuit inserting a variable gain circuit to each output of plural microphones and varying the gain of the variable gain circuit in response to the output voice signal level of the corresponding microphone so as to generate a voice with sufficient sound volume from a speaker even when the speaker and the microphone are approached. CONSTITUTION:Gain variable circuits 13a, 13b are controlled to a gain where an input level to an adder circuit 8 is a reference value or below independently of the acoustic coupling condition with corresponding microphones 6a, 6b and a speaker 5. Then the reference value used for a control circuit 12 is made correspondent to a cancel enable level of a bypass component in an echo cancellation circuit 2 to ensure the cancellation of the bypass component independently of the acoustic coupling condition between the microphones 6a, 6b and the speaker 5. In this case, the sound volume of the speaker 5 is fixed to the gain set in the amplifier circuit 4, then the voice from the opposite party is sounded with a sufficient sound volume.

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