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    • 10. 发明授权
    • Method and apparatus for stabilizing and brightening prerecorded TV
signals encoded with copy protection
    • 用于使用复制保护编码的预先记录的电视信号的稳定和增亮的方法和装置
    • US5661801A
    • 1997-08-26
    • US388560
    • 1995-02-14
    • Martin Sperber
    • Martin Sperber
    • H04N5/913H04N7/167
    • H04N5/913H04N2005/91314
    • A method and apparatus are provided for preventing the existence of pseudo-sync pulses and added AGC pulses in an original video tape with copy protection from producing a poor t.v. picture when simply played on a VCR and viewed on a t.v. monitor. In a first embodiment, the horizontal sync pulses are amplified to eliminate jitter in the signal due to confusion with the chrominance or color burst signal. Further, the color burst signal may be subject to variable gain to correct the color tint. Finally, if desired all portions of an input video signal may be amplified, except for portions of the signal where pseudo-sync pulses and added AGC pulses are normally found, in order to brighten the signal. In another embodiment, all portions of the signal are amplified and the portions of the signal corresponding to pseudo-sync pulses and AGC pulses are attenuated to their normal 1 volt peak-to-peak level. The result of the present invention is such as to reestablish the normal horizontal sync pulse to its normal level, to put the color burst in its proper, ratio and to increase the video dynamic range.
    • 提供了一种方法和装置,用于防止在具有防拷贝保护的原始录像带中存在伪同步脉冲和附加的AGC脉冲,从而不产生较差的t.v。 当简单地在录像机上播放并在t.v上观看时的图片。 监控。 在第一实施例中,水平同步脉冲被放大以消除由于与色度或色同步信号的混淆引起的信号中的抖动。 此外,色同步信号可以经受可变增益以校正色调。 最后,如果需要,输入视频信号的所有部分可以被放大,除了通常发现伪同步脉冲和附加的AGC脉冲的信号的部分,以便使信号变亮。 在另一个实施例中,信号的所有部分被放大,并且对应于伪同步脉冲和AGC脉冲的信号的部分被衰减到其正常的1伏峰 - 峰电平。 本发明的结果是将正常的水平同步脉冲恢复到其正常水平,将色同步脉冲置于其适当的比例,并增加视频动态范围。