利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

3 条记录 (耗时 0.023 秒)

    Key signal conversion device for CATV system
    1.
    发明授权
    Key signal conversion device for CATV system 失效
    CATV系统的关键信号转换装置

    公开(公告)号：US5230019A

    公开(公告)日：1993-07-20

    申请号：US683177

    申请日：1991-04-09

    申请人： Toyokazu Yanagimichi ,  Harumasa Kajita ,  Tetsuo Kariya ,  Toshikazu Wakabayashi ,  Ichiro Kawashima ,  Satoshi Nakanami ,  Masami Tanaka

    发明人： Toyokazu Yanagimichi ,  Harumasa Kajita ,  Tetsuo Kariya ,  Toshikazu Wakabayashi ,  Ichiro Kawashima ,  Satoshi Nakanami ,  Masami Tanaka

    IPC分类号： G06F21/10 ,  H04N7/167

    CPC分类号： H04N7/1675

    摘要： A key signal conversion device for use in a CATV television system in which more than one different scrambling process is performed, the conversion device receiving one of a scrambled high-frequency signal in a television system and a sound intermediate frequency signal in the television system, extracting a key signal for unscrambling the scrambling in the television system and adding the key signal to a nonscrambled television signal which is to be subsequently scrambled by a process other than a process used to scramble the received signal, the key signal conversion device including: a first detecting circuit, for receiving the one of a scrambled television signal and a sound intermediate frequency signal, and for detecting one of a synchronizing signal of the television signal and a synchronizing signal superimposed on the sound intermediate frequency signal; a gate circuit, for receiving the one of a scrambled television signal and a sound intermediate-frequency signal, and for extracting the key signal therefrom using the synchronizing signal detected by the first detecting circuit; a second detecting circuit, for receiving the nonscrambled television signal, and for detecting a synchronizing signal thereof; and an inserting circuit for superimposing the key signal on the nonscrambled television signal in a predetermined horizontal interval in the vertical blanking interval of the nonscrambled television signal by the gate circuit using the signal detected by the second detecting circuit.

    摘要翻译： 一种在CATV电视系统中使用的关键信号转换装置，其中执行多于一个不同的加扰处理，所述转换装置接收电视系统中的加扰高频信号和电视系统中的声音中频信号之一， 提取用于对电视系统中的加扰进行解扰的密钥信号，并将该密钥信号加到未被加密的非扰码电视信号中，该电视信号随后被除了用于加扰接收信号的处理之外的处理加扰，该密钥信号转换装置包括： 第一检测电路，用于接收加扰电视信号和声音中频信号之一，并且用于检测电视信号的同步信号和叠加在声音中频信号上的同步信号之一; 门电路，用于接收扰频电视信号和声音中频信号中的一个，并且使用由第一检测电路检测的同步信号从中提取密钥信号; 第二检测电路，用于接收非加扰电视信号，并用于检测其同步信号; 以及插入电路，用于使用由第二检测电路检测的信号由门电路在非加扰电视信号的垂直消隐间隔中以预定的水平间隔将键信号叠加在非加扰电视信号上。

    Cable television system
    2.
    发明授权
    Cable television system 失效
    有线电视系统

    公开(公告)号：US5161187A

    公开(公告)日：1992-11-03

    申请号：US665949

    申请日：1991-03-07

    申请人： Harumasa Kajita ,  Toyokazu Yanagimichi ,  Tetsuo Kariya ,  Toshikazu Wakabayashi ,  Ichiro Kawashima ,  Satoshi Nakanami ,  Masami Tanaka

    发明人： Harumasa Kajita ,  Toyokazu Yanagimichi ,  Tetsuo Kariya ,  Toshikazu Wakabayashi ,  Ichiro Kawashima ,  Satoshi Nakanami ,  Masami Tanaka

    IPC分类号： G06F21/10 ,  H04N7/167 ,  H04N7/171

    CPC分类号： H04N7/1675

    摘要： A cable television system includes a transmitter and at least one receiver. In the transmitter, sync information is suppressed in amplitude to execute scrambling, and a sync width information signal and key data are superimposed on a television signal during a vertical blanking period. The sync width information signal has a burst form and a predetermined width, and represents whether sync information is present or absent. The key data represents contents of the scrambling. In the receiver, the sync width information signal is recovered, and a sync width information pulse corresponding to the sync width information signal is generated. A reference signal is generated on the basis of an edge of the sync width information pulse. The key data is extracted from the scrambled video information in response to the reference signal. Pseudo sync signals are generated in response to an edge of the sync width information pulse. The sync information of the scrambled video information is increased in amplitude in response to the extracted key data at timings determined by the pseudo sync signals.

    摘要翻译： 有线电视系统包括发射机和至少一个接收机。 在发送机中，以振幅抑制同步信息来执行加扰，并且在垂直消隐期间，将同步宽度信息信号和密钥数据叠加在电视信号上。 同步宽度信息信号具有突发形式和预定宽度，并且表示是否存在同步信息。 密钥数据表示加扰的内容。 在接收机中，恢复同步宽度信息信号，产生与同步宽度信息信号对应的同步宽度信息脉冲。 基于同步宽度信息脉冲的边沿产生参考信号。 响应于参考信号从加扰的视频信息中提取密钥数据。 响应于同步宽度信息脉冲的边沿产生伪同步信号。 响应于由伪同步信号确定的定时，提取的密钥数据，加扰视频信息的同步信息的幅度增加。