Transistor modulator for converting video game signals into antenna input signals for a television receiver
First Claim
1. In a circuit for processing video and sound signals of a video game so as to produce a composite output signal which may be applied to the antenna input of a domestic television receiver to produce a video and audio display of such video game, such processing circuit comprising a frequency modulated oscillator producing FM sound intercarrier signals from such sound signals and an oscillator producing VHF carrier signals, the improvement consisting of a transistor modulator comprising:
- an MOS transistor having a source electrode, a drain electrode and two gate electrodes, one of said source and drain electrodes and said two gate electrodes constituting inputs to said transistor and the other of said source and drain electrodes constituting the output from said transistor;
one of said input electrodes being connected to said FM oscillator to receive said FM sound intercarrier signals, a second one of said input electrodes being connected to said VHF oscillator to receive said carrier signals;
circuit means for applying said video signals to the third one of said input electrodes;
and impedance means connected to said other one of said source and drain electrodes, said MOS transistor being adapted to produce said composite signal across said impedance means.
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Accused Products
Abstract
A transistor modulator for use in a circuit for processing video and sound signals of a video game so as to produce a composite output signal for application to the antenna input of a television receiver to produce a display of such video game. The modulator comprises an MOS transistor having a source electrode, a drain electrode and two gate electrodes. The video and sound signals and a VHF carrier signal are applied to respective ones of the two gate electrodes and either of the source and drain electrodes. The MOS transistor produces the composite output signal across an impedance which is connected to the other of the source and drain electrodes.
7 Citations
3 Claims
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1. In a circuit for processing video and sound signals of a video game so as to produce a composite output signal which may be applied to the antenna input of a domestic television receiver to produce a video and audio display of such video game, such processing circuit comprising a frequency modulated oscillator producing FM sound intercarrier signals from such sound signals and an oscillator producing VHF carrier signals, the improvement consisting of a transistor modulator comprising:
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an MOS transistor having a source electrode, a drain electrode and two gate electrodes, one of said source and drain electrodes and said two gate electrodes constituting inputs to said transistor and the other of said source and drain electrodes constituting the output from said transistor;
one of said input electrodes being connected to said FM oscillator to receive said FM sound intercarrier signals, a second one of said input electrodes being connected to said VHF oscillator to receive said carrier signals;circuit means for applying said video signals to the third one of said input electrodes; and impedance means connected to said other one of said source and drain electrodes, said MOS transistor being adapted to produce said composite signal across said impedance means. - View Dependent Claims (2, 3)
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Specification
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- Resources
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Current AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
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Original AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
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InventorsTran Kiem, Nguyen
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Primary Examiner(s)LaRoche, Eugene R.
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Assistant Examiner(s)Mis, D. C.
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Application NumberUS06/798,082Time in Patent Office404 DaysField of Search332/16 T, 332/17, 332/31 T, 332/42, 332/10, 332/21, 332/22, 332/40, 332/41, 360/29, 360/30, 360/33.1, 358/23US Class Current332/120CPC Class CodesH04N 5/40 Modulation circuits
