Signal detection device of VGA channel
A signal detection and channel technology, applied in the field of televisions, can solve the problems of complexity, high technical difficulty and high processing cost, and achieve the effect of low cost and simple structure
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[0009] see figure 1 As shown, a signal detection device of a VGA channel of the present invention includes a VGA terminal for connecting an external VGA signal source and receiving a VGA signal, a VGA line synchronization signal processing circuit for converting a VGA line synchronization signal into a VGA detection signal, A VGA field synchronization signal processing circuit for converting the VGA field synchronization signal into a VGA detection signal, and a TV MCU for receiving the VGA detection signal to judge whether there is a VGA signal in the TV VGA channel.
[0010] The 13th and 14th pins of the VGA terminal are respectively the input pins of the horizontal synchronous signal and the vertical synchronous signal of the VGA signal, and are respectively connected with the VGA horizontal synchronous signal processing circuit and the VGA vertical synchronous signal processing circuit. When the VGA channel has signal input, the horizontal synchronous signal VGA_HIN of the...
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