Dynamic record level control for optical disc recorder

Details Dynamic record level control for optical disc recorder Dynamic record level control for optical disc recorder

1982-10-28

1985-05-07

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

G11B 700

Patent

active

045162352

ABSTRACT:
In optical disc systems a record level control is provided for adjusting the power of the recording source. The waveform of the data detected during a read-after-write operation contains information concerning the power of the record source. These read-after-write signals are the same as those that are used during an actual playback operation. The record level control is implemented in two ways. In the first, the detected data is averaged to determine the record level. In the second technique the detected data is compared with an "ideal" signal derived from the detected data to provide an indication of a high or low record level. Further, the system includes means for adjusting the record level in response to an indication of a variation in the record level.

REFERENCES:
patent: 3657707 (1972-04-01), McFarland et al.
patent: 4093961 (1978-06-01), Kanamaru
patent: 4097895 (1978-06-01), Spong
patent: 4162398 (1979-07-01), Kayanuma
patent: 4225873 (1980-09-01), Winslow
patent: 4283785 (1981-08-01), Miyauchi et al.
patent: 4328506 (1982-05-01), Yoshida et al.

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