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    Method and apparatus for detecting timing pulses for scrambled television system
    4.
    发明授权
    Method and apparatus for detecting timing pulses for scrambled television system 失效
    用于检测加扰电视系统的定时脉冲的方法和装置

    公开(公告)号：US5206908A

    公开(公告)日：1993-04-27

    申请号：US811585

    申请日：1991-12-20

    申请人： Ryuji Kikuchi ,  Nobuo Uee ,  Fujinori Ozawa ,  Tomonori Suzuki

    发明人： Ryuji Kikuchi ,  Nobuo Uee ,  Fujinori Ozawa ,  Tomonori Suzuki

    IPC分类号： H04N7/16 ,  H04N7/171

    CPC分类号： H04N7/1713

    摘要： A method and apparatus for detecting timing pulses for descrambling a scrambled television signal, wherein a video IF signal and a sound IF signal are separated from a scrambled television IF signal by utilizing different filters, a local video carrier wave synchronized with the separated video IF signal is generated and is mixed with the separated sound IF signal for producing a beat signal, the timing pulses are detected by demodulating the main sound IF signal, and then descrambling the received scrambled television IF signal by stretching horizontal synchronizing intervals in accordance with stretch data obtained by decoding compression data contained the detected timing pulses, whereby the main sound IF signal is separated from the beat signal by attenuating the auxiliary sound IF signal with a bandpass filter.

    摘要翻译： 一种用于检测用于解扰加扰电视信号的定时脉冲的方法和装置，其中通过利用不同的滤波器将视频IF信号和声音IF信号与加扰的电视IF信号分离，与分离的视频IF信号同步的本地视频载波 并且与分离的声音IF信号混合以产生拍子信号，通过解调主声音IF信号来检测定时脉冲，然后根据获得的拉伸数据通过拉伸水平同步间隔来解扰所接收的扰频电视IF信号 通过对包含检测到的定时脉冲的压缩数据进行解码，从而通过利用带通滤波器衰减辅助声音IF信号，使主声音IF信号与拍频信号分离。