Method and apparatus for simultaneously modulating with picture,

Details Method and apparatus for simultaneously modulating with picture, Method and apparatus for simultaneously modulating with picture,

1975-04-02

1976-08-31

Cardillo, Jr., Raymond F.

Telegraphy

Systems

Simplex-reversing periodic

1791003V, 358 4, 360 19, H04N 576

Patent

active

039782794

ABSTRACT:
The picture signal and one of the other two signals (sound, color) frequency modulate a carrier and a subcarrier respectively which in turn modulate the incidence of a light beam cutting a transparent track through a metal film covering a transparent record medium moved past the light source. The frequency modulated carriers produce back and forth movement of the light beam aligned with the direction of transport of the record medium past the light source. The third signal modulates the duty cycle of one of the carriers.

REFERENCES:
patent: 3800100 (1974-03-01), Runge
patent: 3829605 (1974-08-01), Dickopp
patent: 3830968 (1974-08-01), Redlich et al.
patent: 3893163 (1975-07-01), Wessels et al.
patent: 3911476 (1975-10-01), Keizey
Signal Processing in the Philips "VLP" System, Philips Tech. Rev. vol. 33, pp. 181-185, 10/73, No. 7.

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