Apparatus and methods for playback of color picture/sound record

Details Apparatus and methods for playback of color picture/sound record Apparatus and methods for playback of color picture/sound record

1974-12-09

1976-07-27

Griffin, Robert L.

Facsimile and static presentation processing

Static presentation processing

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H04N 576

Patent

active

039720640

ABSTRACT:
Apparatus for use in playback of a color picture/sound disc record includes a stylus having a groove bottom engaging tip, with a conductive electrode having an exposed edge with an effective dimension along the groove which does not exceed the longitudinal dimension of the narrowest depressed groove bottom region of the disc; means for rotating the disc to cause variations in the capacitance exhibited between the stylus electrode and the disc's conductive layer; detection means responsive to the capacitive variations for deriving a train of impulses having a repetition rate varying in accordance with a first FM carrier, bearing modulation representative of luminance and chrominance information, and a duty cycle varying in accordance with a second FM carrier, bearing modulation representative of sound information; means for amplifying the impulse train; first filter means coupled to the amplifier output for selectively passing the first FM carrier and sidebands to a first FM demodulator to effect recovery of (a) the luminance and chrominance signals; and second filter means coupled to the amplifier output for selectively passing the second FM carrier and sidebands to a second FM demodulator to recover (b) the audio signals.

REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 3872497 (1975-03-01), Amery et al.
patent: 3893163 (1975-07-01), Wessels et al.
Wireless World; Oct. 1972, vol. 78, No. 1444, p. 474.
Funkschau; 1972, Heft 23; pp. 851-853; Redlich and Dickopp.

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