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SCART function selection switching control signal processing circuit and method

A technology for controlling signals and processing circuits, applied in the direction of TV, electrical components, color TV, etc., can solve the problems of TVSCART audio and video output error, VCRSCART function selection control signal can not be input, function selection control signal is incorrect, etc., to achieve power consumption reduced effect

Inactive Publication Date: 2011-01-26
SHENZHEN JIUZHOU ELECTRIC
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Problems solved by technology

[0003] The VCR SCART function selection control signal is directly connected to the function selection control signal control pin of the TV SCART interface through a diode. The technical defect is: when the input function selection control signal is at the lower limit of the required range, the TV SCART output function selection control The signal will be incorrect, causing TVSCART audio and video output errors
[0004] After the VCR SCART function selection control signal is monitored by the main CPU of the set-top box, it is controlled by the function selection control signal circuit of the TVSCART interface. The technical defect is: after the main CPU is powered off, the VCR SCART function selection control signal cannot be input to the function selection control of the TV SCART interface. Signal Control Pin

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  • SCART function selection switching control signal processing circuit and method
  • SCART function selection switching control signal processing circuit and method
  • SCART function selection switching control signal processing circuit and method

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Embodiment Construction

[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0035] The function selection control signal of the SCART is to control the aspect ratio of the video received by the SCART TV and the TV / AV switching of the TV signal input. The function selection control signal level is 0-2V, the TV signal input TV; the function selection control signal level is 4.5-7V, the TV signal input AV and the video aspect ratio is 16:9; the function selection control signal level It is 9.5-12V, the TV signal is input to AV and the aspect ratio of the video is 4:3.

[0036] The invention provides a SCART function selection switching control signal processing circuit, fig...

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Abstract

The invention relates to an SCART function selection switching control signal processing circuit and an SCART function selection switching control signal processing method. The circuit comprises a voltage monitoring unit, a level conversion unit and a control signal output unit, wherein a first output end of the voltage monitoring unit is connected with a first input end of the level conversion unit, and a second output end of the voltage monitoring unit is connected with a second input end of the level conversion unit; an output end of the level conversion unit is connected with a first input end of the control signal output unit; a second input end of the control signal output unit is connected with an input end of the voltage monitoring unit and a VCR SCART interface and is used as the input end of the circuit; and an output end of the control signal output unit is connected with a TV SCART interface and is used as the output end of the circuit. The circuit provided by the invention still can realize automatic control of an SCART under the condition of power failure of a main CPU, so that the standby power consumption of a set-top box is reduced below 1W.

Description

technical field [0001] The invention relates to a SCART (Syndicat des Constructeursd' Appareils Radiorecepteurs et Téléviseurs) interface signal switching control technology of a set-top box, in particular to a SCART function selection switching control signal processing circuit and method. Background technique [0002] The set-top box SCART function selection switching control signal processing circuit composed of discrete components, the function selection control signal of the TV SCART interface is output through the circuit designed by the triode. There are two types of designs for the function selection control signal input from the VCRSCART to the TV SCART output: the first VCRSCART interface function selection control signal is directly connected to the control pin of the TV SCART interface through a diode; the second VCR SCART function selection control signal is passed through After monitoring by the main CPU of the set-top box, the control is realized through the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/00
Inventor 邓卫东
Owner SHENZHEN JIUZHOU ELECTRIC
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