Wireless computer picture transmission device

Claim 1

A wireless computer picture transmission device comprising: a VGA (video graphics array) port; a VGA converter connected to said VGA port and adapted for converting computer picture, data signal received from said VGA port into corresponding R.G.B. signal; a video compositor connected to said VGA converter and adapted for composing said R.G.B. signal in video signal; a low pass filter having an input end connected to said video compositor and adapted for removing noise from said video signal, and an output end adapted for output of filtered video signal; a first switch; a second switch; an electronic switch; a first video signal buffer amplifier having an input end connected to the output end of said low pass filter, and an output end connected to an input end of a third video signal buffer amplifier through said first switch, the output end of said first video signal buffer amplifier being controlled by said first switch for signal output; a second video signal buffer amplifier having an input end connected to the output end of said low pass filter, and an output end connected to an input terminal of said second switch, the output end of said second video signal buffer amplifier being controlled by said second switch for video signal output; a third video signal buffer amplifier having an input end connected to said first video signal buffer amplifier through said first switch, and an output end connected to a transmitter module through said second switch for signal output; a transmitter module having an input end connected to said second switch, and adapted for receiving audio signal from an audio equipment and video signal from said second switch, then modulating received audio and video signals into a radio frequency signal, and then amplifying the modulated radio frequency signal, permitting it to be sent into the air through an antenna thereof by means of the control of said electronic switch; a CPU (central processing unit) connected to said transmitter module, and adapted for controlling the selection of the frequency of radio frequency signal and the operation of said electronic switch; and a synchronous detection circuit connected between said second switch, said VGA converter and said video signal compositor, and controlled by said electronic switch for permitting computer signal obtained through said VGA port to have the priority to be firstly sent out through said transmitter module.