Disc reproducing apparatus

Details Disc reproducing apparatus Disc reproducing apparatus

1996-09-10

1998-04-14

Hindi, Nabil

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

H04N 576

Patent

active

057401438

ABSTRACT:
A reproducing apparatus for a disc-shaped recording medium having digital audio signals recorded in a compressed form includes an optical head, a spindle motor, a servo control unit, a decoder, a memory and a controller. The optical head radiates a light beam on the disc-shaped recording medium for reading out data recorded on the disc-shaped recording medium. The spindle motor rotationally drives the disc-shaped recording medium at a constant linear velocity. The servo control unit servo-controls the optical head and the spindle motor based upon error signals generated on the basis of output signal of the optical head. The decoder decodes output signals of the optical head. The memory transiently stores output data of the decoder and the data stored in the memory is read out at a readout rate slower than the write rate of the data outputted from the decoder. The controller controls the optical head and the memory so that, by alternately setting a first period during which data recorded on the disc-shaped recording medium is read out by the optical head and written in the memory and a second period during which readout of data recorded on the disc-shaped recording medium by the optical head is discontinued and only readout of the data stored in the memory is made, the data recorded on the disc-shaped recording medium is read out intermittently. The controller discontinues the operation of the servo control unit during the second period.

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