Filter circuit, filtering method and disc rotation control metho

Details Filter circuit, filtering method and disc rotation control metho Filter circuit, filtering method and disc rotation control metho

1995-06-01

1996-04-23

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 50, 369 4436, 360 7303, G11B 700

Patent

active

055110614

ABSTRACT:
A control signal relating to rotation of a disc or an output signal is selectively output. A selectively output signal is amplified at a first amplification factor. A signal amplified at the first amplification factor and another signal amplified at a second amplification factor are added together. An addition signal is delayed by a first delay time, and output as the output signal. The output signal is delayed by a second delay time, and then output. The signal delayed by the second delay time is amplified at a second amplifying factor, and output as said another signal to be added to the signal amplified at the first amplification factor. Selection between the input signal and the output signal is controlled in accordance with a drive mode of the disc.

REFERENCES:
patent: 5161142 (1992-11-01), Okano
patent: 5170386 (1992-12-01), Tateishi

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