Output signal switching circuit for a video tape recorder
AssigneeSony Corporation
InventorTadashi Ezaki
Life of this patent
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Abstract
An output signal switching circuit for a video tape recorder which has an RF signal changeover switch which is automatically connected to the output terminal of an RF converter during reproduction mode and the video tape recorder is prevented from being automatically switched when a connecting line is connected to a composite video or base band video signal output terminal, thus assuring that the video tape recorder is easier to operate than prior art systems.
Claims7
An output signal switching circuit for a video recorder comprising:
- (a) a switching means for selectively supplying a first RF signal from an antenna or a second RF signal produced by an RF converter to an RF output terminal;
- (b) a control means for detecting when said video recorder is in the reproduction mode and connected to control said switching means so as to select said second RF signal;
- (c) means for supplying a signal from a stage before said RF converter to a line output terminal;
- (d) detecting means for detecting when a connection line is connected to said line output terminal;
- and
- (e) inhibiting means for inhibiting the switching of said switching means upon detection of the reproduction mode by said detecting means.
An output signal switching circuit for a video recorder comprising, a source of incoming RF television signals, a tuner connected to said source of incoming RF television signals, a video processing circuit connected to said tuner and producing a video signal, an audio processing circuit connected to said tuner and producing an audio signal, an RF converter receiving outputs of said video and audio processing circuits, a first RF audio and video output terminal, a switch with its moveable contact connected to said first RF audio and video output terminal and having a first fixed contact connected to said source of incoming RF television signals and having a second fixed contact connected to the output of said RF converter, a control circuit connected to the moveable contact of said switch to control it, a second output video terminal, a detector connected between said video processing circuit and said second output video terminal and detecting when a mating jack is inserted into said second video output terminal and said detector connected to said control circuit to prevent it from operating to move said moveable contact of said switch.
Dependencies are inferred from the claim text.