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Video record player switching system
| Details |
Inventors: Yu, John Pang;
Assignee: RCA Corporation (New York, NY)
Primary Examiner: Griffin; Robert L.
Assistant Examiner: Psitos; Aristotelis M.
Attorney, Agent or Firm: Whitacre; Eugene M., Meagher; William H.
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. |
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DETAILED DESCRIPTION What is claimed is: 1.
In a video record player, including means for recovering recorded signals respectively representative of picture information and accompanying sound information; apparatus comprising, in combination: an external signal input terminal; a player output terminal; a player on/off switch, subject to switching between "on" and "off" conditions; a power supply developing a plurality of supply potentials in response to switching of said player on/off switch to said "on" condition; means, rendered operative in response to supply potential development by said power supply, for forming a player output signal inclusive of picture carrier frequency oscillations and sound carrier frequency oscillations; said player output signal forming means having a picture signal input terminal coupled to said recorded signal recovering means and a sound signal input terminal coupled to said recorded signal recovering means, and including means for modulating the amplitude of said picture carrier frequency oscillations in accordance with recovered picture signal information when present at said picture signal input terminal, and means for modulating the frequency of said sound carrier frequency oscillations in accordance with recovered sound signal information when present at said sound signal input terminal; and a switching system coupled to said power supply, and subject to operation in a first mode in response to development of one of said supply potentials, while subject to operation in a second mode in the absence of said one supply potential development; said switching system, when operating in said first mode, providing a first, low impedance, signal path for coupling said player output signal to said player output terminal, while isolating said external signal input terminal from said player output terminal and said output signal forming means; said switching system, when operating in said second mode, providing a second, low impedance, signal path for coupling said external signal input terminal to said player output terminal, while isolating said output signal forming means from said player output terminal and said external signal input terminal
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