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    • 1. 发明授权
    • Enhanced security for a cable system
    • 增强电缆系统的安全性
    • US5491748A
    • 1996-02-13
    • US203955
    • 1994-03-01
    • Frederick H. Auld, Jr.Michael E. Long
    • Frederick H. Auld, Jr.Michael E. Long
    • H04N7/171H04N7/167
    • H04N7/1716
    • A cable television plant scrambling system incorporates video inversion with a pair of mode signals included in the vertical blanking interval of a scrambled television signal for identifying the proper mode for a video inverting/non-inverting amplifier at a subscriber station. An encoded mode control signal in the form of a byte of data is sent periodically with the scrambled television signal for selecting which of the mode signals is operative. In the receiver, the mode signals are applied to the inverting/non-inverting video amplifier and the encoded mode control signal is supplied to a microprocessor which is provided with a decoding algorithm from the cable head-end. The microprocessor decodes the mode control signal and tells the inverting amplifier which mode signal to look to for proper operation. A new decoding algorithm is periodically downloaded to subscriber stations on an out-of-band basis to enable the encoded mode control signal to be changed.
    • 有线电视设备加扰系统将视频反转与包括在加扰电视信号的垂直消隐间隔中的一对模式信号相结合,用于识别用户台处的视频反相/非反相放大器的适当模式。 数据字节形式的编码模式控制信号与加扰的电视信号周期性地发送,用于选择模式信号中的哪一个是可操作的。 在接收机中,模式信号被施加到反相/非反相视频放大器,并且编码模式控制信号被提供给从电缆头端提供有解码算法的微处理器。 微处理器对模式控制信号进行解码,并告诉反相放大器哪种模式信号要正常工作。 新的解码算法在带外基础上周期性地下载到用户站,以使编码模式控制信号能够被改变。
    • 7. 发明授权
    • Synchronizing pulse restoration circuit
    • 同步脉冲恢复电路
    • US4667232A
    • 1987-05-19
    • US722862
    • 1985-04-11
    • Michael E. Long
    • Michael E. Long
    • H04N7/171H04N7/167H04N5/08
    • H04N7/1716H04N7/1713
    • A decoder for a television signal encrypted with randomly inverted video and randomly suppressed sync pulses includes inverting and noninverting amplifiers for inverting the inverted video and a sync pulse restoration circuit for restoring suppressed sync pulses, all under control of decoder logic. A comparator is coupled to the noninverting amplifier and changes its output voltage in the presence of signal portions extending beyond the mid sync level of the video signal. The output of the comparator is connected to the emitter of a transistor that has its collector supplied through a voltage divider load from a source of blanking level voltage. The junction of the voltage divider receives the decoded video signal. The transistor is driven conductive in response to flyback pulses, corresponding to the occurrence of sync pulses, applied to its base. The transistor conducts only during sync pulse intervals and the level of the decoded video signal during these intervals is brought to a common point, thus restoring all sync tips to the same height. For negative noise spikes, the transistor is not driven conductive and the level of the decoded video signal is held at blanking level.
    • 用于随机反转的视频和随机抑制的同步脉冲加密的电视信号的解码器包括用于反转反转的视频的反相和同相放大器,以及全部在解码器逻辑的控制下恢复抑制的同步脉冲的同步脉冲恢复电路。 比较器耦合到同相放大器并且在存在延伸超过视频信号的中间同步电平的信号部分的情况下改变其输出电压。 比较器的输出端连接到晶体管的发射极,其晶体管的集电极通过分压负载从消隐电平电压源提供。 分压器的结点接收解码的视频信号。 晶体管响应于对应于施加到其基极的同步脉冲的出现的反激脉冲而被驱动导通。 晶体管仅在同步脉冲间隔期间导通,并且在这些间隔期间的解码视频信号的电平达到共同点,从而将所有同步尖端恢复到相同的高度。 对于负噪声尖峰,晶体管不驱动导通,并且解码的视频信号的电平保持在消隐电平。