Reproduced signal processing method, reproduced signal processin

Details Reproduced signal processing method, reproduced signal processin Reproduced signal processing method, reproduced signal processin

1998-09-29

2000-08-15

JeanPierre, Peguy

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

360 55, H03M 112, G11B 502

Patent

active

061043311

ABSTRACT:
A reproduced signal processing circuit includes a variable gain amplifier to which a signal read from a medium by a reproducing head is inputted; an analog-to-digital converter for converting a signal outputted from the variable gain amplifier into a digital signal; and a variable frequency oscillator for supplying an operation clock signal to the analog-to-digital converter. A reproduced signal processing method includes the steps of operating a first control loop for controlling the variable gain amplifier; operating at least either one of a second control loop and a third control loop, the second control loop controlling the variable frequency oscillator, the third control loop controlling the variable frequency oscillator; filtering by analog filter means the read signal inputted to the variable gain amplifier; operating at least one of first, second, and third noise detecting operations, the first noise detecting operation detecting presence or absence of a noise by comparing an amplitude of the output signal from the variable gain amplifier with a predetermined threshold value, the second noise detecting operation detecting a noise during an operation period of the second control loop, the third noise detecting operation detecting a noise during an operation period of the third control loop; and changing the range of cutoff frequency of the analog filter means in accordance with a result from at least one of the first, second, and third noise detecting operations, thereby controlling at least one of the first, second, and third control loops.

REFERENCES:
patent: 4914398 (1990-04-01), Jove et al.
patent: 5057785 (1991-10-01), Chung et al.
patent: 5089757 (1992-02-01), Wilson
patent: 5233482 (1993-08-01), Galbraith et al.
patent: 5559772 (1996-09-01), Takeda
patent: 5847890 (1998-12-01), Hattori

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