Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1976-12-06
1978-06-27
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 83, 360 33, 358188, H04N 522, H04N 700, H04N 578, H04N 544
Patent
active
040978990
ABSTRACT:
Video record player has RF output terminal linked to antenna terminals of a television receiver, and an RF input terminal coupled to antenna lead-in. Player's processing circuits provide respective sound signal and composite video signal outputs during record playback. First oscillator, operating at intercarrier sound frequency (e.g., 4.5 MHz), is subject to frequency modulation by player's sound signal output (when present). Sum of oscillator output and player's composite video signal output (when present) forms modulating signal for an amplitude modulator, which receives carrier waves from second oscillator, operating at selected broadcast picture carrier frequency. A first diode is coupled between modulator output terminal and player's RF output terminal, while second diode is coupled between player's RF input terminal and reference potential point. Normally closed relay provides a conductive path between player's RF input and output terminals when closed. Forward biasing voltages for diodes, and energizing potential for relay's control winding (as well as operating potentials for oscillators) are provided by player's power supply when player is switched on, so that carrier waves from player are supplied to receiver while antenna lead-in is isolated. When player is switched off, antenna lead-in is automatically linked to receiver's antenna terminals.
REFERENCES:
patent: 3484548 (1969-12-01), Kowal et al.
patent: 3573350 (1971-04-01), Rhee
patent: 3795762 (1974-03-01), Willis
patent: 3824335 (1974-07-01), Hart
patent: 3829891 (1974-08-01), Uchida
patent: 4031548 (1977-06-01), Kato et al.
Griffin Robert L.
Meagher William H.
Psitos Aristotelis M.
RCA Corporation
Whitacre Eugene M.
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