公开(公告)号：US5138451A

公开(公告)日：1992-08-11

申请号：US393696

申请日：1989-08-10

申请人： Keiro Shinkawa ,  Tsutomu Noda ,  Toshinori Murata ,  Nobutaka Hotta ,  Kazuhiro Ooyagi

发明人： Keiro Shinkawa ,  Tsutomu Noda ,  Toshinori Murata ,  Nobutaka Hotta ,  Kazuhiro Ooyagi

IPC分类号： H04N5/21 ,  H04N5/44

CPC分类号： H04N5/44 ,  H04N5/211

摘要： A sync generator which generates a reference horizontal synchronizing signal, a time difference detector which detects the time difference between the reference horizontal synchronizing signal and a horizontal synchronizing signal within a received television signal, and a variable delay circuit which responds to an output signal of the time difference detector to control the delay time and delay the received television signal are installed in a television receiver. When a plurality of horizontal synchronizing signals exist in one horizontal scanning period of the received television signal, the time difference between the horizontal synchronizing signal with the maximum amplitude and the reference horizontal synchronizing signal is detected, and the delay time of the received television signal is controlled in the variable delay circuit according to this time difference. As a result, the phase of the horizontal synchronizing signal with the maximum amplitude matches the phase of the reference horizontal synchronizing signal. Therefore, when changes in the receiving environment cause the signal strength of ghosts to become greater than that of an original signal and it becomes desirable to receive the ghost as a main signal in place of the original signal, it is possible to switch from reception of the original signal to reception of the ghost signal without resulting in distortion of synchronization.

摘要翻译： 产生参考水平同步信号的同步发生器，检测接收到的电视信号中的参考水平同步信号和水平同步信号之间的时间差的时差检测器，以及可变延迟电路， 时间差检测器控制延迟时间并延迟所接收的电视信号被安装在电视接收机中。 当在所接收的电视信号的一个水平扫描周期中存在多个水平同步信号时，检测具有最大幅度的水平同步信号与参考水平同步信号之间的时间差，并且所接收的电视信号的延迟时间为 根据该时间差在可变延迟电路中进行控制。 结果，具有最大幅度的水平同步信号的相位与参考水平同步信号的相位匹配。 因此，当接收环境的变化导致重影的信号强度变得大于原始信号的信号强度，并且希望接收重影作为主信号代替原始信号时，可以从接收到 原始信号接收到幽灵信号，而不会导致同步失真。