Circuit and method for switching video signal of digital television receiver
A technology for TV receivers and video signals, which is applied to TVs, color TVs, components of color TVs, etc., can solve the problems of inconvenient switching of video signals, increase the cost of digital TV receivers, etc., and achieve the effect of low cost
Active Publication Date: 2010-09-01
SHENZHEN SKYWORTH DIGITAL TECH CO LTD
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[0013] The purpose of the present invention is to provide a digital television receiver video signal switching circuit and method, aiming to solve the problem of inconvenient digital television receiver video signal switching when the existing digital television receiver performs signal multiplexing at the video signal output end. Problems of Increasing the Cost of Digital TV Receivers
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[0030] see figure 1 , is a functional block diagram of a digital television receiver video signal switching circuit according to an embodiment of the present invention. The digital television receiver video signal switching circuit of the embodiment of the present invention comprises a video output chip 100, a first video output terminal 130, a second video output terminal 140, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a detection circuit 200. The video output chip 100 includes a video signal output terminal 110, an input-output (IO) port 120, the first video output terminal 130 is connected to the video signal output terminal 110 through the eighth resistor R8, and the second video output terminal 140 is connected to the video signal output terminal 140 through the seventh resistor R7 Also connected to the video signal output terminal 110, one end of the detection circuit 200 is connected between the first video output terminal 130 and the eighth...
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The invention is suitable for digital television field, providing a video signal switching circuit of a digital television receiving set, comprising: a video output chip, at least one video output terminal, the video output chip comprises a video signal output terminal and a input / output terminal, the video signal output is connected with the video output terminal. The video signal switching circuit of a digital television receiving set also comprises a detecting circuit, the input terminal of the detecting circuit and the video output terminal are connected with video signal output terminal of the video output chip, the output terminal of the detecting circuit is connected with the input / output terminal of the video output chip. By detecting whether a first video output terminal connected with the detecting circuit is connected with load, the invention can determine the format of video signal to be outputted by the video signal output terminal, in order to realize intelligent switching process on video signals in different format. The technical scheme is simple with low costs.
Description
technical field [0001] The invention belongs to the field of digital television, in particular to a digital television receiver video signal switching circuit and method. Background technique [0002] With the continuous development of my country's economy, people's living standards are gradually improving, and with it comes higher spiritual and cultural needs. The 2008 Beijing Olympic Games is coming soon, and the whole process of the Olympic Games will be broadcast live digitally. During this process, digital TV receivers are particularly important. In the case that most families are not equipped with digital TV, the digital signal can be received through the digital TV receiver to obtain clearer and more realistic pictures and sounds, making watching TV a visual and auditory enjoyment for people. [0003] In order to be compatible with various previous TV sets, the digital TV receiver reserves various audio and video signal interfaces, including interfaces for outputting...
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IPC IPC(8): H04N5/44H04N5/46
Inventor 李剑波赵健章杨忠国
Owner SHENZHEN SKYWORTH DIGITAL TECH CO LTD