Signal processing apparatus for disc memory devices

Details Signal processing apparatus for disc memory devices Signal processing apparatus for disc memory devices

1986-12-17

1988-08-16

Faber, Alan

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 48, 369 59, 369124, 369111, 360 32, 360 51, 360 27, 358342, G11B 2010

Patent

active

047649135

ABSTRACT:
A disc is provided with the equal-interval pits along tracks, at which digital signals are recorded bit by bit. Such a disc is rotated at the constant angular velocity. A signal processing apparatus according to the present invention detects the linear velocity of the track which is at present followed by a pickup. The filtering of a source signal to be recorded and the analog-to-digital conversion of the filtered signal, in the signal processing for recording, are controlled and timed in accordance with the detected linear velocity. Further, the digital-to-analog conversion of a signal read out from the disc and the filtering of the converted signal, in the signal processing for reproducing, are also timed and controlled in response to the detected linear velocity. Thereby, a disc memory device having the large storage capacity and suited for the random access memory can be realized.

REFERENCES:
patent: 4532621 (1985-07-01), Nakagawa
patent: 4550347 (1985-10-01), Nakamuta
patent: 4558375 (1985-12-01), Southeimer
patent: 4603412 (1986-07-01), Yamazaki

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