Scart interface control circuit and video device using the same
AssigneesHONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., Hon Hai Precision Industry Co., Ltd.
InventorsJUN-BO WANG, JUN-KAI WEI
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Abstract
A SCART interface control circuit outputs a mode switch signal to a switch signal pin of the SCART interface according to standby, widescreen and normal modes of video signals. The SCART interface control circuit comprises a first voltage circuit, a second voltage circuit, a voltage combination circuit and an amplifier circuit. The first and second voltage circuits output first and second voltage signals according to the video signal modes, respectively. The voltage combination circuit combines the first and second voltage signals into a combination voltage signal. The amplifier circuit amplifies the combination voltage signal so as to output the mode switch signal for indicating the video signal modes.
Claims17
A SCART interface control circuit connected between a video processing chip and a SCART interface to output a mode switch signal to a switch signal pin of the SCART interface to indicate standby, widescreen and normal modes of video signals, wherein the video processing chip comprises first and second general purpose input/output (GPIO) pins to output high and low level signals according the video signal modes, the SCART interface control circuit comprising:
- a first voltage circuit connected to the first GPIO pin, to output a first voltage signal according to the output of the first GPIO pin;
- a second voltage circuit connected to the second GPIO pin, to output a second voltage signal according to the output of the second GPIO pin;
- a voltage combination circuit to combine the first and second voltage signals into a combination voltage signal;
- an amplifier circuit to amplify the combination voltage signal so as to output the mode switch signal for indicating the video signal modes.
A SCART interface control circuit connected between a video processing chip and a SCART interface to output a mode switch signal to a switch signal pin of the SCART interface to indicate standby, widescreen and normal modes of video signals, wherein the video processing chip comprises a GPIO pin to output high impedance, high or low level signals according the video signal modes, the SCART interface control circuit comprising:
- a first voltage circuit connected to a reference voltage to output the first voltage signal according to the reference voltage;
- a second voltage circuit connected to the GPIO pin to output a second voltage signal according to the output of the first GPIO pin;
- a voltage combination circuit to combine the first and second voltage signals into a combination voltage signal;
- an amplifier circuit to amplify the combination voltage signal so as to output the mode switch signal for indicating the video signal modes.
A video device, comprising:
- a video processing chip to output video signals in standby, widescreen and normal modes, comprising at least one GPIO pin to output high impedance, high or low level signals according the video signal modes;
- a SCART interface comprising a switch signal pin;
- a SCART interface control circuit connected between the video processing chip and the SCART interface to output a mode switch signal to the switch signal pin of the SCART interface to indicate the video signal modes of the video signals, the SCART interface control circuit comprising:
- a first voltage circuit to output the first voltage signal according to alternative one of a reference voltage and the output of a first GPIO pin;
- a second voltage circuit to output a second voltage signal according to the output of a second GPIO pin;
- a voltage combination circuit to combine the first and second voltage signals into a combination voltage signal;
- an amplifier circuit to amplify the combination voltage signal so as to output the mode switch signal for indicating the video signal modes.
Dependencies are inferred from the claim text.