公开(公告)号：EP0191410A3

公开(公告)日：1988-08-24

申请号：EP86101475

申请日：1986-02-05

申请人： HITACHI, LTD.

发明人： Itoh, Masahiro ,  Kobayashi, Masaharu ,  Arai, Takao

IPC分类号： G11B20/18 ,  H03M13/00 ,  H03M13/22

CPC分类号： H03M13/2764 ,  G11B20/1809 ,  H04N5/9267

摘要： In a method of transmitting digital data including the steps of constructing one block by a plurality of digital data, constructing one frame by a plurality of blocks, adding two kinds of mutually different error detection and correction codes to these blocks and transmitting these digital data together with the codes that are added, the digital data are not interleaved, only the error detection and correction codes are interleaved and these interleaved codes are added to the digital data.

公开(公告)号：EP0276343A1

公开(公告)日：1988-08-03

申请号：EP87101110.2

申请日：1987-01-27

申请人： HITACHI, LTD.

发明人： Kobayashi, Masaharu ,  Arai, Takao

IPC分类号： G11B20/10 ,  H04N5/95

CPC分类号： H04N9/802 ,  G11B20/10527 ,  H04N5/956

摘要： In a method and apparatus for recording and reproducing a PCM audio signal together with a video signal or singly using a rotary-head type scanner, an analog audio signal is converted into a digital signal of a predetermined number of quantization bits at a prede­termined sampling period, the digital signal is recorded on a recording medium such as a magnetic tape and an analog audio signal is reproduced from the digital signal reproduced from the recording medium. In a reproducing mode, a signal reproduced from the tape is written into a memory where error detection correction and deinter­leaving are carried out, and the signal is then read from the memory and applied to a D/A converter. A write rate to the memory depends on the video field period, and a read rate depends on the sampling period. Accordingly, a difference between a write address and a read address of the memory depends on the difference between the field period and the sampling period. Accordingly, by changing a master clock which defines the sampling period con­trolled by the read address in accordance with the address difference, the difference between the video signal field period and the audio signal sampling period can be controlled and compensated.

摘要翻译： 在用视频信号一起记录和再现PCM音频信号或者单独使用旋转头式扫描器的方法和装置中，模拟音频信号在预定采样周期被转换成预定数量的量化比特的数字信号 ，数字信号被记录在诸如磁带的记录介质上，并且从从记录介质再现的数字信号中再现模拟音频信号。 在再现模式中，从磁带再现的信号被写入执行错误检测校正和解交织的存储器中，然后从存储器读取信号并将其施加到D / A转换器。 对存储器的写入速率取决于视频周期，读取速率取决于采样周期。 因此，存储器的写入地址和读取地址之间的差异取决于场周期与采样周期之间的差异。 因此，通过根据地址差改变定义由读取地址控制的采样周期的主时钟，可以控制和补偿视频信号场周期与音频信号采样周期之间的差异。

公开(公告)号：EP0183186A3

公开(公告)日：1988-01-20

申请号：EP85114778

申请日：1985-11-21

申请人： HITACHI, LTD.

发明人： Noguchi, Takaharu ,  Kimura, Hiroyuki ,  Kobayashi, Masaharu 331, Hitachi-Hachimanyama Apt. ,  Yunde, Yasufumi ,  Arai, Takao ,  Miura, Kuniaki ,  Amada, Nobutaka

IPC分类号： H04N09/83 ,  H04N05/92

CPC分类号： H04N9/802 ,  H04N5/78213 ,  H04N9/7933 ,  H04N9/8233 ,  H04N9/8355

摘要： In a recording and reproducing apparatus wherein a video signal and an audio signal are recorded on the same recording track, a signal subjected to a quadrature differential PSK modulation with PCM audio signal is generated as an audio recording signal. The audio recording signal is disposed between occupied bands of FM luminance signal and down converted chrominance signal in a video recording signal and also recorded on a track where the video recording signal is to be recorded.

公开(公告)号：EP0129236A3

公开(公告)日：1988-01-07

申请号：EP84106953

申请日：1984-06-18

申请人： HITACHI, LTD.

发明人： Kobayashi, Masaharu Hitachi-Hachimanyama ,  Arai, Takao ,  Noda, Tsutomu

IPC分类号： H04B12/02 ,  G11B05/09 ,  H03K13/01

CPC分类号： G11B20/10527 ,  H03M1/1019 ,  H03M1/504 ,  H04B14/04

摘要： A signal conversion apparatus for use in a PCM signal processing system in which a series of multi-bit digital signals is produced through sampling and quantization of a multi-channel analog signal. The series of multi-bit digital signals (e.q., 109) includes groups of multi-bit digital signals (e.g., 107, 108) being representative of respective analog signal portions (3, 4) constituting the multi-channel analog signal. The apparatus comprises a translating section (e.g., 121) for producing substitutional multi-bit digital signals (122) from at least one (107) of the groups of digitals corresponding to at least one analog signal portion (3), which substitutional digital signals represent amplitudes of the one analog signal portion at sampling points different from those at which the one analog signal was sampled to provide the one group of digital signals The substitutional digital signals are substituted, in the translating section, forthe one group of the digital signals to produce a corresponding group of sampling point- shifted multi-bit digital signals (122) The resulting PCM multi-bit digital signals (109) are acceptable by digital-to-analog conversion processor requiring PCM digital signals generated through sampling at shifted or different sampling points as compared with the above-mentioned series of digital signals

公开(公告)号：EP0149245A3

公开(公告)日：1987-09-23

申请号：EP84116409

申请日：1984-12-27

申请人： HITACHI, LTD.

发明人： Okamoto, Hiroo ,  Kobayashi, Masaharu ,  Arai, Takao ,  Noguchi, Takaharu

IPC分类号： G11B20/18 ,  G11B20/10 ,  G11B20/12 ,  H03M13/00

CPC分类号： G11B20/1208 ,  G11B20/10527 ,  G11B20/1211 ,  G11B20/1803 ,  G11B20/1813 ,  G11B27/3027 ,  G11B27/3063 ,  G11B2020/10546 ,  G11B2020/10592 ,  G11B2220/90 ,  G11B2220/913

摘要： A rotary-head PCM data recorder in which PCM signals of m in number, synchronizing signal (1), control signals (5-10) related to the PCM signals, and a parity signal (4) for error detection and correction are formed into data blocks (0-127), and data blocks of n in number are recorded on one track of a magnetic tape. Among the control signals, bits of signals common to n data blocks (i.e., information needed once for each track) are formed in distributed data allocated in multiple blocks or multiple tracks, and multiple block distributive control data are recorded on one track multiple number of times, or multiple track distributive control data are recorded along n block strings multiple number of times. In reproduction, block or track distributive data are composed to reproduce the control signals. The recorder in this arrangement reduces the bits count needed for the control signals. and is capable of compensating the dropout of reproduced data due to scars on the tape and the like.

公开(公告)号：EP0150811A3

公开(公告)日：1987-08-05

申请号：EP85100696

申请日：1985-01-24

申请人： HITACHI, LTD.

发明人： Okamoto, Hiroo ,  Kobayashi, Masaharu ,  Noguchi, Takaharu ,  Arai, Takao

IPC分类号： G11B20/18 ,  G11B20/10

CPC分类号： G11B20/1809

摘要： @ Disclosed is a method of the arrangement of the error detection/correction code appended to the recording signal for a PCM recorder, that ensures detection and/or correction of a dropout or error of the information block address in the playback operation. (n recording digital signals on a recording medium, the recording signal (8) is formatted in n-word blocks, each block including a sync signal (4) for providing a reference timing for the playback operation, control signal (5) releated to the digital signal, block address signal (6) for identifying the order of n words, error detection signal (7) for detecting the error in the control signal and block address signal, and error detection/correction code (9) used for the error detection and/ or correction for the n-word block. The recording system includes an error detection/correction code generating circuit (17) which produces error detection/correction codes using a Reed Solomon code or b-adjacent code. The generated error detection/correction codes are collected through a multiplexer (18) so that a recording signal is arranged, and it is recorded on the recording medium.

公开(公告)号：EP0222386A2

公开(公告)日：1987-05-20

申请号：EP86115708.9

申请日：1986-11-12

申请人： HITACHI, LTD.

发明人： Arai, Takao ,  Kobayashi, Masaharu ,  Amada, Nobutaka ,  Yumde, Yasufumi ,  Takahashi, Hiroaki

IPC分类号： G11B20/18 ,  G11B20/10

CPC分类号： H04N5/928 ,  G11B20/10527 ,  G11B20/1809 ,  G11B2020/1087

摘要： A PCM audio signal recording and reproducing apparatus samples an audio signal accompanying with a video signal, converts it to a PCM signal, adds an error detection correction data to a predetermined number of PCM data, forms a data frame by those signals, modulates it in accordance with a predetermined modulation system, and records the audio signal together with the video signal or singly on a record medium by using a rotary head type scanner. A digital signal processing circuit having a memory of a predetermined capacity is provided, and the number of digital data to be recorded in one data frame is varied in accordance with a difference between the number of input data of the digital audio signal to the digital signal processing circuit and the number of output data supplied to the record medium for recording. In the recording mode, the PCM audio signal is sectioned into blocks, a data block address signal is added to each block to indicate a relative order to other blocks and complete in one track, certain number of blocks are combined to form a block set for processing signals, and an identification signal completing in the block and an interleave block address signal for indicating a relative order to other blocks are added to each block.

公开(公告)号：EP0169540A3

公开(公告)日：1987-02-04

申请号：EP85109200

申请日：1985-07-23

申请人： HITACHI, LTD.

发明人： Kobayashi, Masaharu 331, Hitachi-Hachimanyama ,  Okamoto, Hiroo ,  Arai, Takao

IPC分类号： G11B20/18

CPC分类号： G11B20/1809

摘要： In a stationary head type PCM recorder having an AID converter for sampling an analog signal and converting the analog signal to a digital signal, a signal processing circuit including data delay means (4-8) for adding an error detection and correction code and a predetermined signal to the digital signal for each error correction group of a predetermined number of samples, and a multi-track head for recording an output of the signal processing circuit on a plurality of tracks of a magnetic record medium and reproducing the signals recorded on the magnetic record medium; incorrectability of the error detection and correction code for a burst error in the output analog signal due to a burst error in the reproduced output is reduced by delaying parity words by the error detection and correction code and the digital signal data by different delay times such that the digital signal data are dispersely recorded in a track direction and a tape transport direction, and allotting the delayed data to the multi-track head such that the data of the adjacent sample points are spaced from each other by at least the distribution length of the parity words and the parity words is arranged between the distributed adjacent data.

公开(公告)号：EP0137346A3

公开(公告)日：1986-12-10

申请号：EP84110989

申请日：1984-09-14

申请人： HITACHI, LTD.

发明人： Noguchi, Takaharu ,  Yamazaki, Shigeru ,  Arai, Takao

IPC分类号： G11B15/473 ,  G11B20/10 ,  G11B20/18 ,  G11B21/10 ,  G11B15/18

CPC分类号： G11B15/4678 ,  G11B5/0086 ,  G11B5/00878 ,  G11B5/09 ,  G11B20/10527 ,  G11B20/1809

摘要： In a rotary head type digital information signal recording and reproducing apparatus having plural rotary heads mounted on a rotary drum so as to be capable of recording and reproducing signals on parallel, oblique tracks on a magnetic tape (10), a tracking signal is recorded on at least one portion (50) of each track which is not overlapped with a portion (49) of each track where a digital information signal is recorded to avoid interference between the tracking signal and information signal. The tape travel speed and the rotary drum rotation speed are changed depending upon the transmission rate for a digital information signal to be recorded and reproduced to make the wavelength of a recorded signal frequency constant irrespective of the signal transmission rate. Tracking control is enhanced without increasing the error rate.

公开(公告)号：EP0076091A3

公开(公告)日：1985-07-03

申请号：EP82304990

申请日：1982-09-22

申请人： Hitachi, Ltd.

发明人： Kojima, Noboru ,  Watatani, Yoshizumi ,  Arai, Takao ,  Hoshino, Takashi ,  Shibuya, Toshifumi

IPC分类号： H04N05/92

CPC分类号： G11B5/035 ,  H04N5/928

摘要： In a magnetic recording and reproducing apparatus of 2-head helical scan type, an overlapping portion is formed at one end of each video track on a magnetic tape, and a PCM audio signal is recorded on this overlapping portion. Video/ audio selective switching circuits (24, 25) are disposed on the input or output side of video and audio recording amplifiers (26, 27), and video/audio selective switching circuits (24, 25) and video/audio playback equalizer circuits (18, 20) are disposed on the output side of video and audio playback amplifiers. Each of the heads acts as both of a video head and an audio head.

摘要翻译： 在2磁头螺旋扫描型的磁记录和再现装置中，在磁带上的每个视频磁迹的一端形成重叠部分，并且PCM音频信号被记录在该重叠部分上。 视频/音频选择性切换电路设置在视频和音频记录放大器的输入或输出侧，并且视频/音频选择性切换电路和视频/音频重放均衡器电路设置在视频和音频播放放大器的输出侧。 每个头都用作视频头和音频头。