Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1995-01-19
1996-08-27
Ben, Loha
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
3695854/, G11B 700
Patent
active
055507999
ABSTRACT:
A laser power calibration device installed in a recording device for recording information on an optical recording medium includes: laser unit for emitting and irradiating a laser beam on the optical recording medium to record FM video signal and EFM audio signal; unit for varying recording power of the laser beam and duty of recording signal for driving the laser unit independently of each other; unit for reading the FM video signal and EFM audio signal recorded on the optical recording medium; unit for detecting carrier level of the recorded FM video signal and error rate of recorded EFM audio signal; and unit for determining optimum recording power of the laser beam so that the carrier level is higher than a first predetermined value and the error rate is smaller than a second predetermined value.
REFERENCES:
patent: 5226027 (1993-07-01), Bakx
patent: 5274622 (1993-12-01), Kono
patent: 5289453 (1994-02-01), Ohno et al.
patent: 5353270 (1994-10-01), Iimura
patent: 5426632 (1995-06-01), Murakami et al.
Inoue Akiyoshi
Kawano Eisaku
Suzuki Hiroshi
Taniguchi Shoji
Yanagawa Naoharu
Ben Loha
Pioneer Electronic Corporation
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