公开(公告)号：US5712948A

公开(公告)日：1998-01-27

申请号：US396430

申请日：1995-02-28

申请人： Masako Yamada ,  Hideki Kaneko ,  Sadayuki Inoue ,  Ikuo Ohkuma

发明人： Masako Yamada ,  Hideki Kaneko ,  Sadayuki Inoue ,  Ikuo Ohkuma

IPC分类号： H04N5/781 ,  H04N5/92 ,  H04N5/926 ,  H04N5/932 ,  H09N5/928

CPC分类号： H04N5/9268 ,  H04N5/9203 ,  H04N5/932 ,  H04N5/781

摘要： A magnetic recording and reproducing apparatus wherein synchronizing separation of a reproduction video signal can be performed accurately and a stabilized reproduction video signal can be obtained. The magnetic recording and reproducing apparatus includes a switch device for selectively inserting, upon recording, a PCM modulated audio signal into a blanking period of an FM modulated video signal, a PCM region signal generator for identifying a region of a PCM modulated audio signal in a reproduction signal reproduced by a rotary head and generating a control signal representative of a PCM audio signal region, an FM demodulator for FM demodulating a reproduction signal from the rotary head into a reproduction FM demodulation signal, and a clip circuit for clipping a lower end portion of a PCM audio signal region of a reproduction FM demodulation signal from the FM demodulator in accordance with a control signal generated from the PCM region signal generator.

摘要翻译： 可以精确地执行再现视频信号的同步分离的磁记录和再现装置，并且可以获得稳定的再现视频信号。 磁记录和重放装置包括一个开关装置，用于在记录PCM调制音频信号到FM调制视频信号的消​​隐期后有选择地插入PCM区域信号发生器，用于识别PCM调制音频信号的区域 由旋转磁头重放并产生代表PCM音频信号区域的控制信号的再现信号，用于将来自旋转磁头的再现信号FM解调成FM再现解调信号的FM解调器，以及用于限制下端部分的剪辑电路 根据从PCM区域信号发生器产生的控制信号，来自FM解调器的再现FM解调信号的PCM音频信号区域。