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    • 62. 发明授权
    • Digital synchronization system
    • 数字同步系统
    • US3878335A
    • 1975-04-15
    • US40769673
    • 1973-10-18
    • RCA CORP
    • BALABAN ALVIN REUBEN
    • H04N5/04H04N5/06H04N5/12H04M5/06
    • H04N5/12
    • A digital vertical deflection rate synchronization system includes a source of clock pulses which drives a divide-by-525 counter and a serial-to-parallel shift register. An incoming low frequency signal such as that obtained from the sync separator stage of a television receiver is scanned at the clock rate to determine whether it exhibits the width characteristic of the vertical sync signal. If the incoming signal does not, the vertical deflection sawtooth generator is synchronized by a pulse derived from the divide-by-525 counter. If the incoming signal does exhibit the vertical sync pulse width characteristic, it is allowed to reset the divide-by-525 counter. In the event that the divide-by-525 counter is reset before it has passed a synchronizing pulse to the vertical deflection sawtooth generator, an overscan limit control circuit senses the collapsing vertical deflection yoke field and creates a vertical deflection synchronizing pulse.
    • 数字垂直偏转率同步系统包括驱动525分频计数器和串并行移位寄存器的时钟脉冲源。 以时钟速率扫描诸如从电视接收机的同步分离级获得的输入低频信号,以确定其是否呈现垂直同步信号的宽度特性。 如果输入信号没有,则垂直偏转锯齿波发生器通过从525分频计数器得到的脉冲同步。 如果输入信号确实表现出垂直同步脉冲宽度特性,则允许将525分频计数器复位。 在525分频计数器在通过同步脉冲到垂直偏转锯齿波发生器之前被复位的情况下,过扫描极限控制电路检测到塌陷的垂直偏转磁轭场并产生垂直偏转同步脉冲。
    • 69. 发明授权
    • Chrominance signal correction
    • US3873990A
    • 1975-03-25
    • US39362673
    • 1973-08-31
    • RCA CORP
    • WILBER JAMES ALBERT
    • H04N9/45H04N9/85H04N5/76
    • H04N9/85
    • In a video disc player, a recorded composite signal, recovered during disc playback, includes a chrominance signal component buried in the midband of the accompanying luminance signal component. The player includes video processing circuits converting the recovered signal to an output composite signal in which the chrominance signal component occupies a higher frequency band, and employing the step of heterodyning the recovered chrominance signal with oscillations at a nominal frequency of fs + fs'' (where fs is the color subcarrier frequency of the output, and fs'' is the buried color subcarrier frequency of the disc signal). To stabilize the output chrominance signal component against spurious frequency variations accompanying disc playback, a phase locked loop (PLL) system is established to cause the fs + fs'' oscillations to track the disc frequency variations. The PLL system employs a voltage controlled oscillator (VCO) operating at a nominal frequency of fs + fs'', and responding to the output of a phase detector, comparing the synchronizing burst component of the output chrominance signal with the highly stable output of a reference oscillator operating at fs. The recorded synchronizing burst component includes bursts of conventional short duration following each horizontal sync pulse but additionally includes an elongated burst component (of the same subcarrier frequency and phase) occupying a line interval during the ''''backporch'''' portion of the vertical blanking interval. The PLL system phase detector is supplied with both short and elongated burst components through use of appropriate line rate and field rate gating of the output chrominance signal. Presence of elongated burst component in the phase detector input substantially precludes ''''sidelock'''' condition (i.e., PLL system locking to a sideband component of the color synchronizing waveform under turn-on conditions when turntable speed is incorrect, and maintaining such a locked state as speed is corrected).