Information reproducing apparatus with a DC level correcting cap

Details Information reproducing apparatus with a DC level correcting cap Information reproducing apparatus with a DC level correcting cap

1993-03-09

1995-05-02

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 58, 369110, 369124, G11B 700

Patent

active

054126320

ABSTRACT:
A signal reproducing system discriminates signals stably in the case of reproducing a signal from an optical recording medium which has coexistent recording areas with the signals recorded in different recording forms therein. Parts that constitute a reproduced signal are respectively derived by corresponding signal detectors from the optical recording medium in which a preformat area and a data area are included as the coexistent recording areas. The average potentials of VFO parts, which are respectively contained in the reproduced signal parts, are detected on the basis of the envelopes of the signal parts by a peak detecting circuit and a bottom detecting circuit. The detected average potentials are compared with a reference voltage, and the resulting difference potentials are added to the reproduced signal by an adder to bring the average potentials of the VFO parts into agreement. Further, an unwanted part of the output signal of the adder corresponding thereto is replaced by a switch with the output signal of a signal generator, which has an average potential equal to the average potential of the VFO parts brought into agreement.

REFERENCES:
patent: 4964000 (1990-10-01), Kanota et al.
patent: 5101395 (1992-03-01), Cardero et al.
patent: 5134607 (1992-07-01), Fuji et al.
"Signal Processing Technique in Optical Recording", K. Tanaka, pp. 116-118.

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