Reading signal processing circuit in optical information reprodu

Details Reading signal processing circuit in optical information reprodu Reading signal processing circuit in optical information reprodu

1991-12-05

1992-11-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

Binary pulse train information signal

Binary signal gain processing

369 54, 369 32, 369124, G11B 700

Patent

active

051649330

ABSTRACT:
In this invention, a reading signal detected by a photodetector is input into two differentiating circuits of different differential constants. The first differentiating circuit differentiates the reading signal with the differential constant larger than that of, for example, the second differentiating circuit and lowers the level of the noise component present as mixed in the reading signal. The first comparing circuit removes the noise component, for example, below the threshold value. The second differentiating circuit differentiates the reading signal with the differential constant converting the peak point of the reading signal, for example, of the above mentioned photodetector to a zero crossing point. The second comparing circuit compares the differential signal of the above mentioned differentiating circuit with the threshold value set, for example, on the zero level and makes the output signal rise, for example, in the center position of an information pit. A bivalued signal logical circuit obtains a bivalued signal made by bivaluing the reading signal from the respective output signals of the first and second comparing circuits.

REFERENCES:
patent: 4475183 (1984-10-01), Marchant et al.
patent: 4743774 (1988-05-01), Maeda et al.
patent: 4764916 (1988-08-01), Mori
patent: 4939710 (1990-07-01), Fuji et al.
patent: 4954903 (1990-09-01), Fuji et al.
patent: 4975897 (1990-12-01), Tanahashi

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