发明授权
US5317410A I-axis detecting circuit provided in color demodulating circuit of TV
receiver
失效
I轴检测电路设在电视接收机的彩色解调电路中
- 专利标题: I-axis detecting circuit provided in color demodulating circuit of TV receiver
- 专利标题(中): I轴检测电路设在电视接收机的彩色解调电路中
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申请号: US836752申请日: 1992-02-19
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公开(公告)号: US5317410A公开(公告)日: 1994-05-31
- 发明人: Hiroki Monta , Toshiaki Tsuji , Kiyoshi Imai
- 申请人: Hiroki Monta , Toshiaki Tsuji , Kiyoshi Imai
- 申请人地址: JPX Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX3-030115 19910225
- 主分类号: H04N9/64
- IPC分类号: H04N9/64 ; H04N9/66 ; H04N11/14 ; H04N9/65
摘要:
An I-axis phase pulse is allowed to be detected at the sampling point of a chrominance signal with a digitally-implemented circuit. A chrominance signal (sampling frequency f.sub.1) is subsampled by a frequency f.sub.2 (f.sub.1 /N) and subsampling pulses generated in N subsampling pulse generators 10 for N phases, the adjacent ones of the pulses being shifted by one clock (1/f.sub.1) with respect to one another. The subsampled chrominance signal is input to an I-axis determining circuit 17. The I-axis determining circuit operates to detect a maximum value M.sub.1 of a color burst signal (sampling frequency f.sub.1) and the data M.sub.2 after one clock and compare both of the values with each other. Based on the compared result, a selecting signal S.sub.4 is detected for selecting an I-axis phase pulse at the sampling point of the chrominance signal. A selecting circuit 18 selects, as an I-axis phase pulse S.sub.5, a proper one of the N sampling pulse for N phases based on the selecting signal and applies the I-axis phase pulse S.sub.5 to an (N+1)th subsampling circuit 19. The subsampling circuit 19 can provide an I-axis detected output S.sub.3 at the sampling point of the chrominance signal.
公开/授权文献
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