AC amplifying RF signal processing circuit for optical disk play

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

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358342, 358160, 369 59, 369 60, 360 67, 360 32, 360 331, G11B 700, H04N 576

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active

048666912

ABSTRACT:
An RF signal processing circuit for processing an RF signal read from an optical disk or the like in which the entire dynamic range of an A/D converter circuit used to digitize the RF signal. An edge detector circuit detects the edges of the amplified RF signal, and a synchronizing signal detector detects a synchronizing signal in correspondence to the output of the edge detector. A timing signal is produced in correspondence to the output of the synchronizing signal detecting circuit. A clamping circuit clamps the input of the edge detector at a predetermined voltage in correspondence to the timing signal, whereby the input of the edge detector is clamped for at least a portion of the time period to the synchronizing signal.

REFERENCES:
patent: 4630231 (1986-12-01), Hirata et al.
patent: 4680647 (1987-07-01), Moriyama

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