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    • 10. 发明授权
    • Monitoring system for TV, cable and VCR
    • 电视,电缆和录像机监控系统
    • US5495282A
    • 1996-02-27
    • US970633
    • 1992-11-03
    • Ayman A. MostafaWendell D. LynchJames M. Jensen
    • Ayman A. MostafaWendell D. LynchJames M. Jensen
    • H04H1/00H04H60/43H04N5/765H04N5/782H04N7/00
    • H04H60/43H04N5/765H04N5/782
    • In a system for monitoring use of a video monitoring system, RF signals are injected into a cable converter and a VCR in order to detect channels selected by the cable converter and VCR. Installation of probes is not required for channel detection. Channel identification signals are also injected into the VCR and cable converter for recording by the VCR on videotape. Respective channel identification signals are provided to the cable converter and VCR with time multiplexing. The state of the "TV/VCR" switch of the VCR is determined by injecting a code signal into the VCR and determining whether that signal is present in an RF video signal output by the VCR. The system includes a switch for interconnecting the cable converter, VCR and TV and also for coupling injection signals to respective inputs of the cable converter and VCR. The system also includes an injection signal receiver that detects signals injected into and passed through the VCR and cable converter for the purpose of channel detection. The receiver also receives data contained in channel identification signals. The receiver is selectively connectable to the VCR and the cable converter. Changes in the signal source for the cable converter and VCR are optionally detected by sampling and holding signal levels during certain horizontal blanking intervals of the signal output from the cable converter or VCR. Monitoring of a system that includes two VCRs is also disclosed.
    • 在用于监视视频监控系统的系统中,RF信号被注入到电缆转换器和VCR中,以便检测由电缆转换器和VCR选择的信道。 通道检测不需要安装探头。 信道识别信号也被注入VCR和电缆转换器,用于通过录像机进行录像。 各种信道识别信号通过时间复用提供给电缆转换器和VCR。 VCR的“TV / VCR”开关的状态通过将代码信号注入VCR并确定该信号是否存在于由VCR输出的RF视频信号中来确定。 该系统包括用于互连电缆转换器,VCR和TV以及用于将注入信号耦合到电缆转换器和VCR的相应输入的开关。 该系统还包括一个注入信号接收器,用于检测注入并通过VCR和电缆转换器的信号,用于通道检测。 接收机还接收包含在信道识别信号中的数据。 接收器可选择性地连接到VCR和电缆转换器。 在电缆转换器或VCR输出的信号的某些水平消隐间隔期间,通过采样和保持信号电平可选地检测电缆转换器和VCR的信号源的变化。 还公开了包括两个VCR的系统的监视。