发明名称 |
TELEVISION RECEIVER WITH SYNCHRONOUS DETECTOR AND COMMON REFERENCE OSCILLATOR |
摘要 |
<p>An automatic fine tuning loop in a television receiver is controlled by phase comparison between a video intermediate frequency signal and a reference oscillator signal. The reference oscillator signal is used in synchronous detection of the video intermediate frequency signal. The frequency of the reference oscillator is controlled by a phase locked loop, of which it is a part, and which includes a low-pass filter having selectable high and low cut-off frequencies. A lock-out detector selects the high cut-off frequency for rapid correction when lock-out is detected and selects the low cut-off frequency for frequency stability when lock-in is detected. An AFT disable switch disables the automatic fine tuning loop during manual tuning. In one embodiment, a disable switch ganged with the AFT disable switch selects the high cut-off frequency in the low-pass filter to prevent hunting.</p> |
申请公布号 |
CA1131768(A) |
申请公布日期 |
1982.09.14 |
申请号 |
CA19790327626 |
申请日期 |
1979.05.15 |
申请人 |
SONY CORPORATION |
发明人 |
HONGU, MASAYUKI;TOKUHARA, MASAHARU |
分类号 |
H04N5/455;H04N5/50;(IPC1-7):04N5/44 |
主分类号 |
H04N5/455 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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