Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1989-10-25
1991-09-17
Richardson, Robert L.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 54, 346 76L, G11B 700
Patent
active
050501569
ABSTRACT:
The present invention automatically performs a series of measurements on an optical media based on writing a power ramp signal of known power levels (amplitudes) on a target sector of the optical media. The amplitudes of the written power levels are measured. A comparison of the measured amplitude of each level of the recorded power ramp signal against reference amplitudes is made to establish a matching factor. The power level having the closest matching factor is selected as the power level to be used for the best recording of data onto the optical media. The procedure may be iterated a number of times to form an average that can then be used as the write power level. The present method also provides a pre-emphasis calibration by writing a pre-emphasis ramp in a target sector which is compared against a desired duty cycle to select the pre-emphasis which yields the desired duty cycle.
REFERENCES:
patent: 4426693 (1984-01-01), Satoh et al.
patent: 4516235 (1985-05-01), Tarzaiski
patent: 4631713 (1986-12-01), Romeas et al.
Dugas Edward
Eastman Kodak Company
Richardson Robert L.
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