发明名称 |
Clock pulse generating circuit in a color video signal reproducing apparatus |
摘要 |
A clock pulse generating circuit in a color video signal reproducing apparatus comprises a first PLL supplied with a horizontal synchronizing signal within a time-division-multiplexed signal reproduced from a recording medium and having a response characteristic such that the first PLL can sufficiently follow a time base deviation in the horizontal synchronizing signal, a second PLL supplied with the horizontal synchronizing signal and having a response characteristic such that the second PLL substantially does not follow a time base deviation or noise in the horizontal synchronizing signal, a circuit for resetting a variable frequency oscillator within the first PLL by a reset signal, where the reset signal is obtained by tapping a signal which is subjected to a phase comparison with the horizontal synchronizing signal in a phase comparator within the second PLL, and a switching circuit for producing a write-in clock pulse from a pulse which is obtained from the first PLL during a write-in operation of memory circuits within first and second time base expanding circuit of the reproducing apparatus and for producing a read-out clock pulse from a pulse which is obtained from the second PLL during a read-out operation of the memory circuits within the first and second time base expanding circuit.
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申请公布号 |
US4597019(A) |
申请公布日期 |
1986.06.24 |
申请号 |
US19840590783 |
申请日期 |
1984.03.19 |
申请人 |
VICTOR COMPANY OF JAPAN, LTD. |
发明人 |
NISHIMOTO, NAOMICHI;ICHINOI, YUTAKA |
分类号 |
H04N5/92;H04N5/932;H04N9/81;H04N9/896;(IPC1-7):H04N5/92;H04N5/95 |
主分类号 |
H04N5/92 |
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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