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21. 发明专利

JP3014285B2 失效
公开(公告)号：JP3014285B2
公开(公告)日：2000-02-28
申请号：JP31142794
申请日：1994-12-15
IPC分类号： G06F5/00 , G10L19/00 , G11B20/00 , H03M7/36 , H04B14/06

22. 发明专利

JP2000022551A PCM SIGNAL ENCODER AND PCM SIGNAL DECODER 失效
公开(公告)号：JP2000022551A
公开(公告)日：2000-01-21
申请号：JP18862498
申请日：1998-07-03
申请人： VICTOR COMPANY OF JAPAN
发明人： YAMABE TAKAO
IPC分类号： H03M7/36 , H04B14/06
摘要： PROBLEM TO BE SOLVED: To provide a PCM signal encoder capable of detecting a bit error without using a special error detection word, outputting highly reliable reproducing sound and performing highly efficient encoding and the decoder. SOLUTION: Continuous audio signals are divided into blocks sectioned by a prescribed sample length unit by a block buffer 1 and supplied to predictors 3-6 prepared for plural kinds and the audio signals of the next sample are respectively predicted. Then, the prediction residual signals of predicted value signals outputted from the predictors 3-6 and the source audio signals of the next sample are calculated in subtractors 7-10 and an optimum prediction residual signal is selected from them in a selector 16. Further, the selected prediction residual signal is encoded in a quantizer 17 and bit distribution information, predictor selection information and the source audio signal corresponding to the last prescribed sample part of the encoded prediction error signal included in a preceding stage block are packed and outputted from a multiplexer 18.

23. 发明专利

JP2973675B2 失效
公开(公告)号：JP2973675B2
公开(公告)日：1999-11-08
申请号：JP960292
申请日：1992-01-23
申请人： NIPPON DENKI KK
发明人： HAMAME FUMIE
IPC分类号： H04B14/04 , H03M7/30 , H04B1/66 , H04B14/00 , H04B14/06 , H04J3/00 , H04J3/16 , H04J3/22 , H04Q11/04

24. 发明专利

JPH11243376A SOUND DECODING DEVICE 失效
公开(公告)号：JPH11243376A
公开(公告)日：1999-09-07
申请号：JP5733198
申请日：1998-02-24
申请人： KOKUSAI ELECTRIC CO LTD
发明人： GOTO HIROKI
IPC分类号： G10L19/00 , H04B14/06 , H04L1/00 , G10L9/00
摘要： PROBLEM TO BE SOLVED: To save power in a digital sound decoding device utilizing a radio line by reducing the deterioration of sound quality caused by continuing correction even for a frame with weak power at the time of correcting the deterioration of reproduced sound quality due to burst-like transmission error. SOLUTION: The number of error frames to be counted by an error frame number counter 24 is inputted to a control frame number arithmetic equipment 41, the frame affected by an error, which comes after the error frame, is added and a power correction control frame number (r) is calculated. In this case, power information (q) from a power calculator 22 is fetched and a correcting section corrected by a power corrector 23 is made to be short when power is smaller than a prescribed threshold value.

25. 发明专利

JPH11243341A METHOD FOR ENCODING AND DECODING VOICE 失效
公开(公告)号：JPH11243341A
公开(公告)日：1999-09-07
申请号：JP14303598
申请日：1998-05-25
申请人： SANYO ELECTRIC CO
发明人： INOUE TATSUO
IPC分类号： G10L19/00 , G10L19/04 , H03M7/38 , H04B14/06 , G10L9/18
摘要： PROBLEM TO BE SOLVED: To reproduce and output a stored code by voice decoding it even when code writing is interrupted during writing the code by comparing the output parameter value of a reproduction output signal obtained by voice decoding processing with preliminarily set threshold and adjusting the initial value of quantization width. SOLUTION: A threshold setting means 7 sets threshold about '(maximum value of) an amplitude of reproduced voice' which is used by an internal state adjusting means 8 and is outputted from an ADPCM decoding means 3. The means 8 compares the maximum value of the amplitude of reproduced voice which is outputted from the means 3 with threshold that is preliminarily set by the means 7 in size relation and performs processing on whether or not to exceed the threshold. When the maximum value of the amplitude of the reproduced voice does not exceed the threshold as a result of the processing, correction is performed in such a manner that the value of quantization width becomes large and on the other hand, when the maximum value of the amplitude of the reproduced voice exceeds the threshold, adjustment not to change the value of the quantization width is made.

26. 发明专利

JP2927242B2 失效
公开(公告)号：JP2927242B2
公开(公告)日：1999-07-28
申请号：JP16915396
申请日：1996-06-28
申请人： NIPPON DENKI KK
发明人： HATSUTORI TAKESHI
IPC分类号： G10L19/00 , H04B14/06 , H04L1/00

27. 发明专利

JP2891922B2 失效
公开(公告)号：JP2891922B2
公开(公告)日：1999-05-17
申请号：JP4112796
申请日：1996-02-28
申请人： SAITAMA NIPPON DENKI KK , NIPPON DENKI KK
发明人： SHIONO KATSUMI , ONO SHIGERU
IPC分类号： H04L1/00 , H04B7/26 , H04B14/04 , H04B14/06

28. 发明专利

JP2853716B2 失效
公开(公告)号：JP2853716B2
公开(公告)日：1999-02-03
申请号：JP10327791
申请日：1991-03-08
申请人： NIPPON DENKI KK
发明人： KATO TADAHARU
IPC分类号： H03M7/38 , H04B14/06 , H04J3/00 , H04J3/06 , H04Q11/04

29. 发明专利

JPH10319995A VOICE CODING METHOD 失效
公开(公告)号：JPH10319995A
公开(公告)日：1998-12-04
申请号：JP17967797
申请日：1997-07-04
申请人： TOSHIBA CORP
发明人： AMADA KO , AKAMINE MASAMI
IPC分类号： G10L19/04 , G10L19/08 , G10L19/12 , G10L25/90 , H03M1/00 , H03M7/30 , H04B14/06 , G10L9/14 , G10L9/00
摘要： PROBLEM TO BE SOLVED: To provide a voice coding method capable of obtaining a high tone quality by performing a coding reflecting an abrupt change and a variability of pitch cycles. SOLUTION: An LPC information 11 expressing the transmission characteristic of a synthetic filter 106 generating a synthetic voice signal by inputting a driving signal is calculated from an input voice signal in an LPC analyzing part 101. Then, local pitch cycles expressing time lengths of one pitch waveform of the input voice signal are obtained from the voice signal in a pitch mark generating part 102. Moreover, coding sections are determined based on the local pitch cycles and the driving signal with which the distortion of the synthetic voice signal becomes minimum is generated every coding section in a driving signal generating part 104 and the LPC 11 and pitch mark information 12 expressing the local pitch cycles and pitch waveform and gain information 13 expressing the driving signal are outputted as coding data.

30. 发明专利

JP2816044B2 失效
公开(公告)号：JP2816044B2
公开(公告)日：1998-10-27
申请号：JP4234692
申请日：1992-01-30
IPC分类号： H03J3/00 , H03M5/16 , H04B14/06 , H04L25/03 , H04N5/60

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