Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1984-03-06
1986-10-07
McElheny, Jr., Donald
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369109, 369111, 369124, G11B 700
Patent
active
046163565
ABSTRACT:
A signal processor and method for frequency compensating the drive signal for an optical modulator in an optical recording apparatus to make the exposure level modulation amplitude on the medium independent of the spatial frequency of the information being recorded. The processor compensates for exposure level modulation roll off at high spatial frequencies due to the finite size of the recording spot by increasing the amplitude of the modulator drive signal at high frequencies. The compensation is preferably the inverse of the modulation transfer function of the recording objective lens.
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patent: 4426693 (1984-01-01), Satoh et al.
Firester et al., "Optical Recording Techniques for the RCA Video Disc" from RCA Review, Sep. 1978, pp. 427-471.
Dakin Wayne R.
Wilkinson Richard L.
Brown Steven P.
McElheny Jr. Donald
Optical Disc Corporation
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