发明名称 |
Videodisc reproducing apparatus |
摘要 |
A videodisc reproducing apparatus includes a pilot carrier extraction circuit for extracting a pilot carrier from a videodisc reproduced signal and a clock generating circuit. The clock generating circuit includes an analog/digital converter and a phase-locked loop oscillator for generating a sampling clock signal for the analog/digital converter, whereby the videodisc reproduced signal is converted into digital form in synchronism with the pilot carrier. A phase-shift circuit is provided for phase shifting the sampling clock signal and for applying a thus phase-shifted sampling clock signal to the analog/digital converter. A phase detecting circuit is provided for detecting a digital sampling phase of a synchronizing signal included in a MUSE signal of the videodisc reproduced signal which has been converted into digital form according to positional information in the synchronizing signal of the videodisc reproduced signal detected by a synchronizing signal detection circuit. The phase detecting circuit further detects whether the detected digital sampling phase is advanced or retarded with respect to a digital sampling phase of a specified normal MUSE signal. An up/down counter is provided for generating an address signal output according to an output of the phase detecting circuit to control the phase-shift circuit.
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申请公布号 |
US5062005(A) |
申请公布日期 |
1991.10.29 |
申请号 |
US19890304646 |
申请日期 |
1989.02.01 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
KITAURA, HIROMU;HIRAUCHI, YOSHIO |
分类号 |
H04N9/797;H04N9/87;H04N9/89 |
主分类号 |
H04N9/797 |
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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