Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1991-04-17
1993-04-06
Young, Wayne R.
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 50, 369 59, 369124, G11B 2010
Patent
active
052009440
ABSTRACT:
A disc playback apparatus for reproducing data from a disc having digital data including at least image data or computer data recorded sequentially thereon includes: a spindle motor for rotating the disc; a pick-up assembly for reading and outputting data from the disc, as an electrical signal; waveshaping circuit for shaping the electrical signal into a pulse signal; a clock extracting circuit for extracting a playback clock signal from the pulse signal; a reference clock generating circuit controlled by a reference clock control circuit, for continuously varying and outputting a frequency of the reference clock signal; and a switching circuit which is switched on and off, the reference clock control circuit increasing the frequency of the reference clock signal when the switching circuit is switched on, and decreasing it when the switching circuit is switched off; a rotation servo circuit for controlling the spindle motor so that the frequency of the playback clock signal is consistent with the frequency of the reference clock signal; a digital signal processing circuit for receiving the pulse, playback clock and reference clock signals and for latching data from the pulse signal on the basis of the playback clock signal, and for processing and outputting the latched data according to the reference clock signal; and a processing and outputting circuit for receiving data outputted from the digital signal processing circuit and for processing and outputting attributes of the data.
REFERENCES:
patent: 4829497 (1989-05-01), Sako et al.
patent: 4845572 (1989-07-01), Yasuda
patent: 4847697 (1989-07-01), Tobe
patent: 4870509 (1989-09-01), Nagasawa et al.
patent: 4896221 (1990-01-01), Mashimo
Matsushita Electric - Industrial Co., Ltd.
Young Wayne R.
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