Matrix circuit for optical disc systems

Details Matrix circuit for optical disc systems Matrix circuit for optical disc systems

1984-06-12

1986-10-14

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369124, 369 45, G11B 713

Patent

active

046176543

ABSTRACT:
A matrix circuit is disclosed having four inputs for coupling to either the four elements in a four-quadrant photodetector in a one-beam optical disc system or to the six elements in a hex photodetector in a three-beam optical disc system. A fifth input is provided with a logic input determined by which system is being implemented. Three outputs are provided, one each for signal, tracking error and focus error. The circuit will accommodate both systems to produce the required outputs with a minimum of redundant parts.

REFERENCES:
patent: 4011400 (1977-03-01), Simons et al.
patent: 4337534 (1982-06-01), Basilico et al.
patent: 4355383 (1982-10-01), Dolby

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