Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1981-10-13
1983-12-27
Richardson, Robert L.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
307234, 318312, 358322, 358338, 360 744, 369 50, 369 59, 369189, 369240, G11B 1924
Patent
active
044234988
ABSTRACT:
A digital audio disc (DAD) reproducing apparatus comprises pulse width detection and pulse width-to-voltage conversion means for detecting a signal having a predetermined pulse width such as a maximum or minimum pulse width of code modulated digital data signals reproduced by a pickup and converting the detected signal to a voltage proportional to the pulse width, and pulse width error detection means for detecting an error between the converted voltage and a reference voltage corresponding to a reference pulse width. Since the pulse width of the digital data signal changes with a clock rate, the error from the reference voltage represents an error in the clock rate.
REFERENCES:
patent: 2334510 (1943-11-01), Roberts
patent: 3646259 (1972-02-01), Schuller
patent: 3980960 (1976-09-01), Hutchinson
patent: 4086538 (1978-04-01), Foreman
patent: 4190860 (1980-02-01), Somers et al.
patent: 4223349 (1980-09-01), Dakin et al.
patent: 4348699 (1982-09-01), Tsuchiya et al.
Kimura Hiroyuki
Nishimura Keizo
Ohashi Shin-ichi
Hitachi , Ltd.
Richardson Robert L.
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