Data recording and reproducing apparatus and method

Details Data recording and reproducing apparatus and method Data recording and reproducing apparatus and method

1983-03-14

1985-12-10

Richardson, Robert L.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

G11B 700

Patent

active

045584419

ABSTRACT:
In a data recording and reproducing apparatus and method, a modulator is provided for MF-modulating recording data and a pulse converter generates a pulse signal having pulses which have a predetermined pulse width and which are synchronous with the leading and trailing edges of the pulses of the signal from the modulator. An optical head, a peak detector, a flip-flop circuit and a demodulator are also provided. The optical head radiates a high-energy laser beam, or a recording beam, to an optical disk in response to the pulse signal from the pulse converter, thereby recording the data on the disk. To reproduce the data, the optical head continuously emits a low-energy laser beam to the disk. The beam reflected from the disk is converted into an electrical signal. The peak detector detects the peaks of the electrical signal and generates a pulse signal having pulses which are synchronous with the peaks of the electrical signal. The flip-flop circuit generates a pulse signal having pulses which rise in synchronism with the trailing edges of the pulses of the signal from the peak detector and whose widths correspond to the intervals of the peaks of the electrical signal. The demodulator MF-demodulates the pulse signal from the flip-flop circuit, thereby reproducing the recording data.

REFERENCES:
patent: 4293944 (1981-10-01), Izumita et al.
patent: 4308612 (1981-12-01), Miyauchi et al.
patent: 4423498 (1983-12-01), Kimura et al.

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