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    Rotary head type recording/reproducing method and apparatus
    2.
    发明公开
    Rotary head type recording/reproducing method and apparatus 失效
    Verfahren undGerätzur Aufzeichnung / Wiedergabe mit rotierendenKöpfen。

    公开(公告)号：EP0276809A1

    公开(公告)日：1988-08-03

    申请号：EP88101100.1

    申请日：1988-01-26

    申请人： HITACHI, LTD. ,  HITACHI VIDEO ENGINEERING, INC.

    发明人： Kobayashi, Masaharu ,  Nishimura, Yukio

    IPC分类号： H04N5/92 ,  G11B20/12

    CPC分类号： G11B20/1809 ,  G11B20/1208 ,  H04N5/9268 ,  H04N9/7925 ,  H04N9/802

    摘要： A rotary-head type magnetic tape recorder for recording a video signal and an audio signal on a magnetic tape by means of a rotary head (31; 43) controlled on the basis of the video signal. Difference is determined between a rate at which the digital audio signal is recorded on the recording medium and which is determined by the video signal and a rate of input data determined by a sampling frequency of the audio signal for a number N of samples of the digital signal to be included within one field period synchronized with the video signal. The number of samples for one field of input data is set by preparing on the basis of the result of detection of the difference in rate a first field containing a number of samples greater than the number N within and s second field containing a number of samples smaller than the number N. Blocks for recording the PCM audio signal on the recording medium are prepared by adding a first error detection/correction code to the audio signal for every n symbols, while the symbols are imparted with amounts of delay differing from one another and subjected to diagonal incomplete interleave for thereby adding a second error detection/correction code. After addition of a block synchronizing signal, recording is performed on the tape. By adopting the variable fields, matching can be attained between the asynchronous audio and video signal fields. Reproduction capability notwithstanding of burst error is enhanced by incomplete diagonal interleave. Difference in time lag between the video signal and the audio signal involved in the reproduction thereof can be suppressed to a minimum.

    摘要翻译： 一种用于通过基于视频信号控制的旋转头（31; 43）将视频信号和音频信号记录在磁带上的旋转磁头型磁带录像机。 在数字音频信号被记录在记录介质上的速率和由视频信号确定的速率与由数字N个样本的音频信号的采样频率确定的输入数据的速率之间确定差异 信号被包括在与视频信号同步的一个场周期内。 通过根据差异率的检测结果，准备包含多于N个数的样本的第一场和包含多个采样的第二场的第二场，来设定一个场输入数据的样本数 通过在每个n个符号的音频信号中添加第一错误检测/校正码来准备用于在记录介质上记录PCM音频信号的块，而符号被赋予相互不同的延迟量 并进行对角不完全交错，从而添加第二错误检测/校正码。 在添加块同步信号之后，在磁带上执行记录。 通过采用可变字段，可以在异步音频和视频信号字段之间获得匹配。 不完整的对角线交错增强了突发错误的繁殖能力。 视频信号与其再现中涉及的音频信号之间的时间差的差异可以被抑制到最小。

    Multiplex magnetic recording and reproducing apparatus of the rotary head type
    3.
    发明公开
    Multiplex magnetic recording and reproducing apparatus of the rotary head type 失效
    Mehrfaches magnetisches Aufzeichnungs- undWiedergabegerätmit rotierendem Kopf。

    公开(公告)号：EP0275041A2

    公开(公告)日：1988-07-20

    申请号：EP88100166.3

    申请日：1988-01-08

    申请人： HITACHI, LTD. ,  HITACHI VIDEO ENGINEERING, INC.

    发明人： Kobayashi, Masaharu ,  Arai, Takao ,  Yumde, Yasufumi ,  Uto, Kazuo ,  Amada, Nobutaka ,  Toeda, Hiroshi ,  Zama, Hideo ,  Masuda, Michio

    IPC分类号： G11B20/10 ,  G11B5/008 ,  G11B20/22 ,  G11B20/06

    CPC分类号： G11B5/0086 ,  G11B5/00878 ,  G11B5/02 ,  G11B20/10527 ,  H04N5/78213 ,  H04N9/7921 ,  H04N9/802

    摘要： In a helical scan type magnetic recording and reproducing apparatus using rotary heads, magnetic heads (22a and 22b) for FM audio signals, magnetic heads (23a and 23b) for PCM audio signals, and magnetic heads (24a and 24b) for a video signal are arranged on a cylinder, respectively. The FM audio magnetic heads (22a and 22b), the PCM audio magnetic heads (23a and 23b), and the video signal magnetic heads (24a and 24b) have mutually differ­ent azimuth angles, respectively. The FM audio signals are first recorded in a deep layer (39) of a magnetic tape (26) by the FM audio heads, the digital modulation signals of the PCM audio signals are then recorded in an inter­mediate layer (40) by the PCM audio heads, and the video signal is finally recorded in a surface layer (41) by the video signal heads. Upon recording, the FM carrier frequency of the audio signals and the digital modulation carrier frequency of the PCM audio signals are set to frequencies lower than the frequency band of the FM luminance signal in the video signal. The Offset Quadrature Differential Phase-Shift Keying (O-QDPSK) modulation is used as a method of digitally modulating the PCM audio signals.

    摘要翻译： 在使用旋转磁头的螺旋扫描型磁记录和再现装置中，用于FM音频信号的磁头（22a和22b），用于PCM音频信号的磁头（23a和23b）以及用于视频信号的磁头（24a和24b） 分别设置在气缸上。 FM音频磁头（22a和22b），PCM音频磁头（23a和23b）和视频信号磁头（24a和24b）分别具有相互不同的方位角。 FM音频信号首先通过FM音频头记录在磁带（26）的深层（39）中，然后通过PCM音频将PCM音频信号的数字调制信号记录在中间层（40）中 头，并且视频信号最终由视频信号头记录在表面层（41）中。 在记录时，音频信号的FM载波频率和PCM音频信号的数字调制载波频率被设置为低于视频信号中的FM亮度信号的频带的频率。 使用偏移正交差分相移键控（O-QDPSK）调制作为对PCM音频信号进行数字调制的方法。