发明名称 |
Channel selection system for television receiver |
摘要 |
When a receiving channel of television broadcast is selected by the frequency sweep, a video carrier and an audio carrier appear alternately at an output of an intermediate frequency (IF) stage. A channel selection system is disclosed, which distinguishes the video carrier and the audio carrier from each other by the presence or absence of a sync. separation pulse during the frequency sweep, in which a sync. pulse is distinguished from a noise pulse by the presence or absence of a horizontal flyback pulse and the video carrier is distinguished from the audio carrier in response to the presence or absence of the sync. pulse to selectively stop the sweep.
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申请公布号 |
US4240114(A) |
申请公布日期 |
1980.12.16 |
申请号 |
US19780918450 |
申请日期 |
1978.06.23 |
申请人 |
HITACHI LTD |
发明人 |
FUSHIMI, KIYOSHI;SHIMIZU, KEIZO |
分类号 |
H04N5/50;H03J5/02;H03J7/18;H03J7/28;H04N5/44;(IPC1-7):H04N5/44 |
主分类号 |
H04N5/50 |
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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