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41. 发明专利

JP2603065B2 失效
公开(公告)号：JP2603065B2
公开(公告)日：1997-04-23
申请号：JP18104985
申请日：1985-08-20
IPC分类号： H04B14/06 , H03H17/00 , H03H17/02 , H03H21/00 , H04B3/23

42. 发明专利

JPH0993208A ADPCM CORRECTION SYSTEM 失效
公开(公告)号：JPH0993208A
公开(公告)日：1997-04-04
申请号：JP24928595
申请日：1995-09-27
申请人： KYOCERA CORP
发明人： MIYAMOTO SEIJI
IPC分类号： H03M7/38 , H03M13/00 , H04B14/06 , H04L1/00
摘要： PROBLEM TO BE SOLVED: To correct the voice information of a specific talker by generating a replaced correction pattern from a PCM signal so as to decrease deterioration in the voice of the specific talker. SOLUTION: A demodulated ADPCM code and redundant data such as CRC are inputted to an error check section 21, from which the presence of an error is outputted. Data outputted from the error check section 21 are inputted to a data replacement section 22, a data correction device 24 and a replacement and correction pattern generating device 26. Furthermore, the demodulated ADPCM code is inputted to the data replacement device 22, and when the error check section 21 detects an error, an optional pattern is read from a replacement pattern memory and the data pattern is replaced with the read pattern. The replacement pattern and the correction pattern are generated from a PCM signal in this way, the replacement pattern and the correction pattern of each specific talker differ from each other, the deterioration in the voice of each specific talker is reduced and voice information of each specific talker is corrected. Furthermore, the patterns are corrected in duplicate by the data replacement device and the data correction device to attain efficient correction.

43. 发明专利

JPH0991887A DIGITAL SIGNAL PROCESSING METHOD AND DEVICE 失效
公开(公告)号：JPH0991887A
公开(公告)日：1997-04-04
申请号：JP24329595
申请日：1995-09-21
申请人： SONY CORP
发明人： ICHIMURA HAJIME , NOGUCHI MASAYOSHI , FUKAMI TADASHI
IPC分类号： G11B20/14 , G11B20/18 , H03M3/02 , H04B14/06 , H04L7/02
摘要： PROBLEM TO BE SOLVED: To highly accurately interpolate error data generated at the time of transmitting or recording and reproducing 1bit digital data subjected to a ΣΔ modulation by a simple arithmetic operation. SOLUTION: An interleaving unit 17 disperses inputted consecutive 1bit audio data over a range equal to or wider than a specific range. An error detector 22 applies the error detecting processing of, for example, 4bit width to the dispersed output data transmitted from a transmission line 19. A deinterleaving unit 23 applies a deinterleaving processing to the dispersed output data to restore them to the consecutive 1bit audio data before the interleaving and also, at the same time, error detection information detected in the error detector 22 are allocated again to corresponding positions. An interpolation processing unit 24 specifies error data among the output data of the deinterleaving unit 23 by using the error detection information obtained in the error detector 22 to interpolate the specified error data.

44. 发明专利

JPH0923197A DEVICE FOR IMPROVING SOUND QUALITY 失效
公开(公告)号：JPH0923197A
公开(公告)日：1997-01-21
申请号：JP17355795
申请日：1995-07-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SUZUKI MASANOBU , KUBOTA SHUJI
IPC分类号： G10L19/00 , H03M7/38 , H04B14/06 , G10L9/18
摘要： PROBLEM TO BE SOLVED: To suppress the deterioration of a sound by fading in a digital communication system by extending a code distance corresponding to the adaptive difference PCM(AOPCM) code of a differential value '0' in accordance with the increment of the absolute value of the differential value and executing mapping conversion. SOLUTION: A digital sound signal obtained by A/D conversion is encoded to a differential signal by an ADPCM encoder 12 and a mapping conversion for the ADPCM code is executed by a mapping conversion circuit 13. One of 4-bit codes in which a distance from the code of a differential value '0' is '1' is allocated as an ADPCM code in which the absolute value of the differential value is

45. 发明专利

JP2551147B2 失效
公开(公告)号：JP2551147B2
公开(公告)日：1996-11-06
申请号：JP12440389
申请日：1989-05-19
申请人： KOKUSAI DENSHIN DENWA CO LTD
发明人： HACHITSUKA YOTARO , NOMURA TAKAHIRO , IIZUKA SHIGERU
IPC分类号： G10L19/04 , G10L19/00 , H03M1/12 , H04B14/06 , G10L9/18 , G10L9/14

46. 发明专利

JPH08506952A 失效
公开(公告)号：JPH08506952A
公开(公告)日：1996-07-23
申请号：JP50929395
申请日：1994-09-13
IPC分类号： H04L27/18 , G10L19/00 , H03C1/54 , H03H1/02 , H03M1/00 , H03M1/38 , H03M3/02 , H03M3/04 , H04B1/26 , H04B1/40 , H04B7/26 , H04B14/06 , H04L25/03 , H04L27/00 , H04L27/20 , H04Q7/38 , G10L9/18

47. 发明专利

JPH08163394A BACKGROUND NOISE GENERATOR 失效
公开(公告)号：JPH08163394A
公开(公告)日：1996-06-21
申请号：JP30194394
申请日：1994-12-06
申请人： NEC CORP
发明人： NAKAGAWA MASASHI
IPC分类号： H03K3/84 , H04B1/04 , H04B14/06 , H04L12/70 , H04N5/00
摘要： PURPOSE: To generate the background noise having an arbitrary gain value by generating the exclusive OR signal between a code signal for gain setting and a random number bit or its inverted signal in each period of a frame clock and supplying this generated signal to a signal processing part as background noise data in the background noise period. CONSTITUTION: A random number generation circuit 21 artificially generates random numbers independently taking '0' or '1' in each frame period synchronously with a frame clock FCK and successively outputs it. A gain adjustment signal S5 outputs a binary code indicating the value of a prescribed gain in series synchronously with a data clock DCK. Since exclusive OR between this signal S5 and a random number data signal S21 is operated by a logic part 22, background noise data as the output signal coincides with the signal S5 in the frames of random number data '0' but coincides with the code obtained by inverting bits or the signal S5 in the frames of random number data '1'. The noise reproduced based on this background noise has a wide frequency band and is sufficiently used.

48. 发明专利

JPH08140044A ADAPTIVE FILTER DEVICE 失效
公开(公告)号：JPH08140044A
公开(公告)日：1996-05-31
申请号：JP27809894
申请日：1994-11-11
申请人： TOSHIBA CORP
发明人： SAKAZAKI YOSHIHISA , ABE SHUJI
IPC分类号： H04N5/92 , G11B27/19 , H03H21/00 , H03M7/30 , H04B14/06
摘要： PURPOSE: To provide excellent expanded pictures by appropriately setting the characteristics of a filter means arranged in the post stage of an expansion means matching the characteristics of distortion and a frequency band provided in data to be transmitted. CONSTITUTION: A special reproduction data generation circuit 2 generates the data for special reproduction from packet-transmitted compressed data and a filter factor corresponding to the data for the special reproduction is decided by a filter factor decision circuit 3. A data mixing circuit 4 mixes and outputs the compressed data, information for indicating the data for the special reproduction and the information for indicating the filter factor. Thereafter, a decoder 8 selects one data, expands them and supplies them to a filter 9. Simultaneously, a reproduction circuit 7 detects a reproducing data filter factor and supplies it to the filter 9. The filter 9 switches the frequency band, limits the frequency band of input signals and performs output based on the supplied filter factor. Thus, the need of setting the filter factor by a user is eliminated on an expansion side and appropriate filter characteristics are realized at all times.

49. 发明专利

JPH0884372A BASE STATION FOR DIGITAL RADIO TELEPHONE SYSTEM 失效
公开(公告)号：JPH0884372A
公开(公告)日：1996-03-26
申请号：JP24196294
申请日：1994-09-09
申请人： CANON KK
发明人： HAMADA MASASHI
IPC分类号： H04B14/06 , H04W72/04 , H04Q7/38
摘要： PURPOSE: To realize a base station for a digital radio telephone system in which efficient radio data communication is attained by avoiding the reduction in a data transfer rate. CONSTITUTION: In the digital radio telephone system accommodating an integrated services digital network 1 being ISDN for a wired digital communication network, in the case of data communication using a digital radio medium, a switch is provided to select an information transfer bus for radio base stations 110,111 and a wired exchange network 100 from voice transmission into bulk digital data transmission so as to realize efficient radio data communication without deteriorated data transfer rate.

50. 发明专利

JPH0879089A COMPRESSOR FOR TIME SERIES OBSERVATION DATA 失效
公开(公告)号：JPH0879089A
公开(公告)日：1996-03-22
申请号：JP21236894
申请日：1994-09-06
申请人： KOBE STEEL LTD
发明人： ONISHI ATSUSHI , TAMURA NAOKI , TAKAHASHI TETSUYA
IPC分类号： G08C15/06 , H03M7/36 , H03M7/40 , H04B14/06
摘要： PURPOSE: To provide the compressor for time series observation data by which the time series observation data are compressed at a high compression efficiency. CONSTITUTION: In the compressor 1, a differential processing means 20 applies differential processing to time series observation data taking an integral value, a discrimination means 21 discriminates whether or not the data subject to differential processing are within a prescribed range, and data at the outside of a prescribed range are not compressed by a storage means 22 but stored in an external storage device 9. On the other hand, the differential processing data within a prescribed range are converted into 1-byte data below raw data and subject to Huffman coding for the compression. Through the constitution above, since the 1-byte data are subject to Huffman coding, the compression rate by the Huffman coding is improved and the data type for coding is reduced, then high speed processing is attained within a small capacity of the external storage device 9.

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