Patent ID: 7133063

Claim:
An electronic endoscope apparatus comprising: an electronic endoscope equipped with an image pickup device; a main unit which is connected with the electronic endoscope and includes a processor unit; a common power/signal line which connects the electronic endoscope with the main unit; a power supply circuit which is installed in the main unit and supplies power to the electronic endoscope via the common power/signal line; a video waveform superimposing circuit which is installed in the electronic endoscope and superimposes a video signal obtained by the image pickup device on the power transmitted through the common power/signal line; a pulse waveform superimposing circuit which superimposes reference pulses on a blanking period in the first field or first frame of the video signal; a pulse separating circuit which separates the reference pulses superimposed on the common power/signal line; a circuit which forms a signal in synchronization with the reference pulses; and a video separating circuit which is installed in the processor unit and separates the video signal superimposed on the common power/signal line.