| 摘要 |
<p>The circuit for detecting the standard signal of the NTSC format by generating the clock with n times frequency of the burst signal locked to the input signal, counting the clock for one field, obtaining the difference between the counted value and the preset data, comparing the difference with the preset error-to lerance data to generate the NTSC standard signal and the NTSC non- standard signal, includes an waveform reshaper (204) for reshaping the vertical synchronizing signal according to the burst signal (nfsc), and a comparator for comparing the input value of the stage of an error-tolerance data (211) with the output value of an absolute value converter (207).</p> |
