Optical recording/playback apparatus incorporating an address re

Details Optical recording/playback apparatus incorporating an address re Optical recording/playback apparatus incorporating an address re

1995-10-20

1997-11-04

Psitos, Aristotelis M.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369124, 369 32, 369 58, 369116, G11B 7125

Patent

active

056847696

ABSTRACT:
A optical recording/playback apparatus projects a laser beam on to a recording medium to read out precoded address data and record or read out data in the data recording area of the recording medium. The reflected light from the recording medium is detected by photosensors which produce currents from the received light intensity, and the currents are converted into voltage signals by current-to-voltage converting amplifiers and the signals are summed by a summing amplifier. The summing amplifier has a switching means, by which the gain is brought to unity or near-unity value during the period of reading the data recording area, so that the summed output has a smaller difference of voltage levels for the address area and data recording area even though the detected light intensity has a large difference between these portions. The output of summing amplifier is fed through a high-pass filter prior to the zero-cross detection, and a smaller differentiation pulse resulting from the smaller voltage level difference enables the reliable readout of address data.

REFERENCES:
patent: 4833662 (1989-05-01), Yoda
patent: 4890274 (1989-12-01), Kaneko
patent: 5475671 (1995-12-01), Ishikawa

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