公开(公告)号：EP0183186B1

公开(公告)日：1991-08-14

申请号：EP85114778.5

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 ,  Amada, Nobutaka ,  Miura, Kuniaki

IPC分类号： H04N9/83 ,  H04N5/92

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

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：EP0183186A2

公开(公告)日：1986-06-04

申请号：EP85114778.5

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 ,  Amada, Nobutaka ,  Miura, Kuniaki

IPC分类号： H04N9/83 ,  H04N5/92

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：EP0176888A1

公开(公告)日：1986-04-09

申请号：EP85111931.3

申请日：1985-09-20

申请人： HITACHI, LTD.

发明人： Miura, Kuniaki ,  Yunde, Yasufumi ,  Kotani, Kazunori ,  Fukushima, Isao ,  Kano, Kenji

IPC分类号： H04N5/78 ,  H04N5/21

CPC分类号： H04N5/142 ,  H04N5/923 ,  H04N9/646

摘要： Disclosed is a circuit for emphasizing a video signal (e,) in the vertical direction of a television picture for minimizing noise appearing during reproduction. In the circuit, a signal obtained by delaying an input video signal (e1) by one horizontal scanning period (1H) is positively fed back through a feedback circuit (2, 3) to the input of the input video signal. An amplitude difference signal (e 4 ) between the video signal (e 2 ) after being fed back through a positive feedback loop and the delayed video signal (e 3 ) is produced and added (7) to the input video signal (e,) to provide an output video signal (e o ).