Closed loop laser noise elimination for optoelectronic recording

Details Closed loop laser noise elimination for optoelectronic recording Closed loop laser noise elimination for optoelectronic recording

1977-09-13

1978-09-12

Konick, Bernard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003N, 1791003GN, 1791003V, 250205, 331 945S, 346 76L, 346108, 365206, G11B 700, H03F 128, H03F 130

Patent

active

041141806

ABSTRACT:
In an optoelectronic audio/video recording system wherein a laser beam which is subject to undesired broad-spectrum noise is intensity modulated by a light modulator with an audio/video intelligence signal, a feedback control loop is provided including a half-silvered mirror disposed in the path of the beam to transmit a greater part of the light energy to the light modulator and to reflect some of the light to a photoelectrical transducer to convert the reflected light into corresponding electrical signal, a plurality of filter-amplifier circuits for dividing the frequency spectrum of the signal into a plurality of separate frequency bands to provide outputs accentuated such that each output has a particular amplitude versus frequency characteristic corresponding to a portion of the noise spectrum, and a second light modulator disposed in the path of the beam incident to the half-silvered mirror to effect the intensity modulation of the beam with the outputs from the separate filter-amplifiers to suppress the undesired broad-spectrum noise, to an acceptable level.

REFERENCES:
patent: 3720453 (1973-03-01), Lee et al.
patent: 3780296 (1973-12-01), Waksberg et al.
patent: 3787887 (1974-01-01), Burton
patent: 3903360 (1975-09-01), Kamisaka et al.
patent: 4051329 (1977-09-01), Blondet et al.

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