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71. 发明专利

JPH07111700A CROSSTALK SOUND CONTROLLER 失效
公开(公告)号：JPH07111700A
公开(公告)日：1995-04-25
申请号：JP25325993
申请日：1993-10-08
申请人： MATSUSHITA ELECTRIC IND CO LTD , HIGASHI NIPPON RYOKAKU TETSUDO
发明人： KOBA MASAO , NAKAMA YASUTOSHI , TERAI KENICHI , HASHIMOTO HIROYUKI , MAEKAWA YOSHIO , ABIKO HIROSHI , HASEBE KAZUNORI
IPC分类号： G01H3/00 , G10K11/178 , H04R3/00 , H04S7/00
摘要： PURPOSE:To attenuate a crosstalk sound and to listen only to a sound which a listener likes to listen to by generating signals compensating environment noise by means of adaptive filters based on the detector output of noise and adding them to respective detector outputs. CONSTITUTION:A noise signal detected in a detector 6c convolutes approximated transmission functions from the detector 6c to a detector 6b by the adaptive filter 1c and they are outputted to an adder 3c. The output of a delay unit 2c and the output of the filter 1c are added in the adder 3c, and the addition signal is set to be the control signal of the filters 1c and 1a. The filter 1c executes adaptive control by which the control signal becomes a minimum and output from the adder 3c becomes only the crosstalk sound. Output from an adder 3d similarly becomes only the crosstalk sound. The filters 1a and 1b adaptively control detection signals from the corresponding detectors 6b and 6a, and therefore the crosstalk sound from speakers 4a and 4c to the detectors 6b and 6a is attenuated.

72. 发明专利

JPH06332477A MUFFLER 失效
公开(公告)号：JPH06332477A
公开(公告)日：1994-12-02
申请号：JP12252393
申请日：1993-05-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HASHIMOTO HIROYUKI , TERAI KENICHI , NAKAMA YASUTOSHI , TAMURA TADASHI , KOBA MASAO
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/04
摘要： PURPOSE:To provide a muffler which employs an active noise control and expands the noise control range without increasing the number of adaptive filters by approximating the transfer functions of a first control point and a second control point using the filter circuit connected to the adaptive filter which especially controls the first control point. CONSTITUTION:The muffler consists of a microphone 1a which detects noise from a noise source, an adaptive filter 2 which adaptively controls detected noise signals, a speaker 6a which reproduces the output of the filter 2, a microphone 1b which detects the reproduced sound and noise, a filtered-x FIR filter 3 which processes the output signals of the microphone 1a, an LMS computing element 4 which computes and updates the coefficients of the filter 2 from the output of the filter 3 and the output of the microphone 1b, an FIR filter 5 which processes the output signals of the filter 2 and a speaker 6b which reproduces the output of the filter 5.

73. 发明专利

JPH06332476A DEVICE FOR CONTROLLING CROSS TALK SOUND 失效
公开(公告)号：JPH06332476A
公开(公告)日：1994-12-02
申请号：JP12252293
申请日：1993-05-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HASHIMOTO HIROYUKI , TERAI KENICHI , NAKAMA YASUTOSHI , TAMURA TADASHI , KOBA MASAO
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/04 , H04B3/23 , H04R3/00 , H04S5/02
摘要： PURPOSE:To provide a device for controlling cross talk sound which makes operation of an adaptive filter sure using a delay unit, compensates a transfer function by a filter circuit, and attenuates a cross talk sound from near position at one's ear. CONSTITUTION:This device is provided with an adaptive filter 2a, a Filtered- xFIR filter 3a and a delay unit 5a which appropriately control a signal from a sound source 1a, an adaptive filter 2b, a Filtered-xFIR filter 3b and a delay device 5b which appropriately control signal from a sound source 1b, filter circuit 6a, 6b which processes output signals from adaptive filters 2a, 2b respectively, an adder 7a adding an output of the delay unit 5a and an output of a switch circuit 11d, an adder 7b which adds an output of the delay unit 5b and an output of a switch circuit 11c, loudspeaker 8a reproducing an output of the adder 7a, a loudspeaker 8b reproducing an output of the adder 7b, microphones 9a, 9b which are mounted near the loudspeaker 8a, 8b respectively.

74. 发明专利

JPH06161469A NOISE ELIMINATING DEVICE AND IN-ROOM NOISE ELIMINATING DEVICE 失效
公开(公告)号：JPH06161469A
公开(公告)日：1994-06-07
申请号：JP31483192
申请日：1992-11-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAMURA TADASHI , NAKAMA YASUTOSHI , TERAI KENICHI , HASHIMOTO HIROYUKI
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178
摘要： PURPOSE:To provide the noise eliminating device which accurately eliminates a noise even when control transfer characteristics have a zero point or deep dip and the in-room noise eliminating device which uses the noise eliminating device. CONSTITUTION:This device consists of a noise detector 1, adaptive filters 2 which receive its detection signal, speakers 3 which are cascaded to both the adaptive filters, a microphone group 5 consisting of plural microphones which detect differences between a sound from a noise source and sounds from both the speakers, adders 11 which adds the output signals of the microphone group 5, computing elements 7 which perform convolutional arithmetic between the transfer characteristics from the speaker group 3 to the microphone group calculated from the output signals of the adders 11 and the noise detection signal, normalization units 8 which normalize the values of the output signals of the computing elements 7, and multipliers 9 which multiply the normalization outputs by the error output of the microphone group 5 and outputs update signals for the coefficients of the adaptive filters 2.

75. 发明专利

JPH06161468A NOISE ELIMINATING DEVICE AND ON-VEHICLE ACOUSTIC DEVICE 失效
公开(公告)号：JPH06161468A
公开(公告)日：1994-06-07
申请号：JP31483092
申请日：1992-11-25
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAMURA TADASHI , NAKAMA YASUTOSHI , TERAI KENICHI , HASHIMOTO HIROYUKI
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178
摘要： PURPOSE:To provide the noise eliminating device which accurately eliminates a noise even when control transfer characteristics have a zero point or deep dip and the on-vehicle acoustic device which uses the noise eliminating device. CONSTITUTION:The device consists of a noise detector 1, adaptive filters 2 which receive its detection signal, speaker groups 3 which consist of plural speakers cascaded to the adaptive filter 2 respectively, a microphone group 6 of plural microphones which detect differences between a sound from a noise source and sounds from both the speaker groups 3, adders 11 which add the output signals of the microphone group 6, computing elements 7 which perform convolutional arithmetic between the transfer characteristics from the speaker group 3 to the microphone group calculated from the output signal of the adder 11 and the noise detection signal, normalization units 8 which normalize the values of the output signals of the computing element 7, and multipliers 9 which multiply the normalization outputs by the error output of the microphone group 6 and output update signals for the coefficients of the adaptive filters 2.

76. 发明专利

JPH04190396A NOISE ELIMINATING DEVICE 失效
公开(公告)号：JPH04190396A
公开(公告)日：1992-07-08
申请号：JP32359690
申请日：1990-11-26
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TERAI KENICHI
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178 , H03H21/00 , H04B3/04
摘要： PURPOSE:To precisely suppress sound even though a zero point or a deep dip is present in a frequency characteristic as one control transmission characteristic, by transmitting control sounds for suppressing sound with the use of a plurality of control transmission paths. CONSTITUTION:A detection signal for a noise detector 1 is inputted to adaptive filters 2, 4 from which outputs are issued from speakers 3, 5. Then, they pass through control transmission characteristic C1, C2 and reaches, as control sounds, a microphone 13 so that noise from a noise source 12 is suppressed. Where the speakers 3, 5 are set so that the characteristics C1, C2 are different from each other. Errors between the control sounds and the noise are detected by a microphone 13 and are delivered to multipliers 8, 11. Meanwhile, a detection signal from a noise detector 1 is subjected to computation by convolution computers 8, 9 having the characteristics C1, C2, and is then multiplied with the error signals from the microphone by the multipliers 8, 11. Thus multiplied values are inputted as coefficient updating signals to the adaptive filters 2, 4. With this arrangement, it is possible to obtain a sound suppressing effect even though the frequency characteristic as one of the transmission characteristic has a zero point or a deep dip.

77. 发明专利

JPH0447705A ADAPTIVE EQUALIZER IMMUNE TO NOISE 失效
公开(公告)号：JPH0447705A
公开(公告)日：1992-02-17
申请号：JP15688790
申请日：1990-06-14
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TERAI KENICHI , NAKAMA YASUTOSHI , HASHIMOTO HIROYUKI , SUZUKI TOMOKAZU , SUZUKI RYOJI
IPC分类号： G01H3/00 , H03G3/32 , H03G5/16 , H03H17/02 , H03H21/00 , H04R3/04
摘要： PURPOSE:To attain accurate adaptive processing of an acoustic correction equalizer even under noisy environment by applying adaptive filter processing to a signal detected by a noise detector so as to cancel a noise signal and activating the adaptive equalizer for acoustic characteristic correction. CONSTITUTION:At first a 1st selection means 4 selects a signal of a noise detector 2 and a 2nd selection means 5 selects a coefficient memory of a 1st adaptive filter 7 to activate a filter coefficient controller 6. Then the 1st selection means 4 selects an acoustic input signal and selects a coefficient memory of the 2nd adaptive filter 11 to activate the filter coefficient controller 6. That is, a noise signal entering a listening position microphone 9 is detected by the noise detector 2, the noise signal is cancelled with a signal subject to adaptive filter processing to activate the adaptive equalizer 3 for acoustic characteristic correction. Thus, proper processing is made accurately even under noisy environment.

78. 发明专利

JPH0443799A NOISE CONTROLLER 失效
公开(公告)号：JPH0443799A
公开(公告)日：1992-02-13
申请号：JP15195090
申请日：1990-06-11
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAKAMA YASUTOSHI , TERAI KENICHI , SUZUKI RYOJI , HASHIMOTO HIROYUKI , SUZUKI TOMOKAZU
IPC分类号： G01H3/00 , G10K11/16 , G10K11/178 , H03H17/00 , H03H17/02 , H03H21/00 , H04R3/04
摘要： PURPOSE:To control noise in real time and to control also noise from plural noise sources by extracting a signal separated from a noise signal of independent system from a signal from an error detector and applying processing so as to minimize the signal. CONSTITUTION:Plural noise signals detected by one error detector 8 are given to an arithmetic circuit 10, from which noise signals for each noise source are separated. In this separation, a signal controlling plural adaptive filters 4a - 4n and being an output of signal processing circuits 5a - 5n and inputted to the arithmetic circuit 10 is used to input transfer function information of noise sources 1a - 1n and the subtraction processing method is used to separate each noise signal sequentially. The separated noise signal is extracted by extraction devices 11a - 11n and inputted to the signal processing circuits 5a - 5n. The arithmetic processing is implemented independently to each noise source and the environment minimizing noise at the listening point is attained. Thus, the minimum condition environment of noise at the listening point is created in real time for plural noise sources.

79. 发明专利

JPH03284098A SILENCER 失效
公开(公告)号：JPH03284098A
公开(公告)日：1991-12-13
申请号：JP8653390
申请日：1990-03-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： HASHIMOTO HIROYUKI , NAKAMA YASUTOSHI , TERAI KENICHI , SUZUKI RYOJI , SUZUKI TOMOKAZU
IPC分类号： H04R3/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To attain adaptive control with high accuracy for the entire band by dividing a signal detected by a noise detector and an error detector into plural frequency bands and using the result as an input signal and a control signal for an adaptive filter. CONSTITUTION:A microphone 1a provided in the vicinity a noise source detects a noise and inputs it to a dividing circuit 3a. The circuit 3a divides the noise into a high frequency signal and a low frequency signal. Both signals are subjected to adaptive control at adaptive filters 4a, 4b, and added by an adder 7. The result is reproduced by a speaker 6 and the signal is interfered with the noise at a listening point. The interference tone is detected by a microphone 1b and inputted to a dividing circuit 3b. The circuit 3b is formed identical to the circuit 3a to control the filters 4a, 4b. Thus, each control signal is subjected to adaptive control so as to be made small and the sound reproduced from the speaker 6 and the noise are cancelled together to reduce the noise at the listening point.

80. 发明专利

JPH03213097A ADAPTIVE FILTERING DEVICE 失效
公开(公告)号：JPH03213097A
公开(公告)日：1991-09-18
申请号：JP864990
申请日：1990-01-18
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： SUZUKI RYOJI , NAKAMA YASUTOSHI , TERAI KENICHI , HASHIMOTO HIROYUKI , SUZUKI TOMOKAZU
IPC分类号： G10L15/20 , G10L19/00 , G10L21/02 , H03H21/00 , H04B1/10 , H04R3/00
摘要： PURPOSE:To enlarge a range to cancel noise by providing first and second load adders and an adaptive processor to control an internal coefficient so that a function outputted form the second load adder can be decreased, and to execute an output while convolving the output of the first load adder and the internal coefficient. CONSTITUTION:The noise is inputted from an acoustoelectric converter group 11 and a load adder 13 calculates a sum while weighting respective input signals. Next, a sound mixing the noise is inputted from an acoustoelectric converter group 12 and a load adder 14 calculates the sum while weighting the respective input signals. An adaptive processor 15 controls the internal coefficient so as to decrease the function outputted, from the load adder 14 and convolves the output of the load adder 13 and the internal coefficient. An acoustoelectric converter group 16 loudly speaks the output of the adaptive processor 15 at plural places. Thus, the adaptive processor is made immune to the noise not related to the noise to be canceled, and the range to cancel the noise can be enlarged, further.

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