Compact disc (CD) player and method of compensating for tracking

Details Compact disc (CD) player and method of compensating for tracking Compact disc (CD) player and method of compensating for tracking

1987-05-27

1989-01-03

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

360 7811, 369 33, 358907, G11B 700

Patent

active

047962470

ABSTRACT:
To provide for continuity of audio output from a compact disc (CD) player, installed in an environment subject to shock or vibration, for example in a motor vehicle, the CD player includes an extra write-read memory (31), placed in the signal processing path of a signal scanned by an optical scanning system to a digital/analog converter in advance of an audio output system (AR), a repositioning system (36) to reposition the optical scanning optical system on a track which may have been lost due to a jolt or vibration, and a synchronizing system to synchronize writing in the write-read memory after repositioning of the optical scanning system at the end of previously written data in said write-read memory immediately in advance of tracking loss. Tracking loss can be sensed by determining loss of information data, or sensing of a scanning beam from the optical scanning system impinging on the mirror surface of the CD, with the number of tracks being jumped being determined by comparing timing data included in the CD scanned data with previously recorded data to thereby determine the length of track, and hence the number of track spirals which were skipped or jumped. Preferably, scanning and writing after detection of a tracking jump and repositioning is accelerated to rapidly refill the write-read memory, for example by increasing an operating clock rate while maintaining constant the read-out rate from the write-read memory (31).

REFERENCES:
patent: 4698796 (1987-10-01), Kimura

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