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    • 6. 发明授权
    • Sampling clock generation circuit of video signal
    • 视频信号采样时钟发生电路
    • US4780759A
    • 1988-10-25
    • US912945
    • 1986-09-29
    • Kenichi MatsushimaFumihiro TanakaYoshio ShimadaKaneo YamaguchiShinya Watanabe
    • Kenichi MatsushimaFumihiro TanakaYoshio ShimadaKaneo YamaguchiShinya Watanabe
    • G06K15/12G09G5/12G09G5/18H03L7/08H03L7/081H03L7/18H04N5/14H04N5/91H04N5/932H04N11/04H04N7/08H04N7/093
    • H03L7/081H04N5/14H04N5/932
    • A recording apparatus receives a video signal containing a horizontal sync signal and a data signal comprised of a given number of image bit data arranged within each horizontal scanning period, and stores the number of image bit data in synchronization with the horizontal sync signal. A voltage-controlled oscillator produces in synchronization with the horizontal sync signal a frequency signal having a frequency higher than that of the sync signal. A divider frequency-divides the frequency signal by a given factor to produce a number of sampling pulses corresponding to the given number of image bit data. A data sampling circuit receives the data signal for sampling therefrom the number of image bit data in response to the corresponding sampling pulses to thereby write the image bit data into memory. Another divider frequency-divides the frequency signal by the product of the given factor and the given number to produce a feedback signal. A comparator compares the phase of the feedback and sync signals with each other to produce a control signal effective to maintain the VCO to continuously produce the frequency signal synchronized with the horizontal sync signal.
    • 记录装置接收包含水平同步信号的视频信号和由在每个水平扫描周期内排列的给定数量的图像比特数据构成的数据信号,并且与水平同步信号同步地存储图像比特数据的数量。 压控振荡器与水平同步信号同步产生频率高于同步信号频率的频率信号。 分频器将频率信号除以给定的因子以产生对应于给定数量的图像比特数据的多个采样脉冲。 数据采样电路响应于相应的采样脉冲接收用于从其中采样数据信号的数据信号,从而将图像位数据写入存储器。 另一个分频器将频率信号除以给定因子与给定数量的乘积,产生反馈信号。 比较器将反馈和同步信号的相位彼此进行比较,以产生有效地保持VCO以连续产生与水平同步信号同步的频率信号的控制信号。