Patent ID: 7623157

Claim:
A video system comprising: a video camera; a camera controller for controlling said video camera; a transmission medium for communicating at least one polarity sensitive signal between said video camera and said camera controller; and at least one a polarity correction circuit, said at least one a polarity correction circuit comprising: a polarity controller configured to detect an incorrect polarity in said polarity sensitive signal and provide an inversion signal in response to said incorrect polarity, and an inversion circuit configured to invert said incorrect polarity in said polarity sensitive signal in response to said inversion signal, said inversion circuit comprising: at least one receiving terminal for receiving an input signal; at least one transmitting terminal for transmitting an output signal, first and second transceivers coupled to said at least one receiving terminal, and third and fourth transceivers coupled to said at least one transmitting terminal, said first and third transceivers being configured for providing an output representative of said input signal with said first transceiver being normally enabled and said third transceiver being normally disabled, said second and fourth transceivers being configured for providing an output representative of said output signal with said fourth transceiver being normally enabled and said second transceiver being normally disabled; wherein said polarity controller is further configured to detect an incorrect connection of said input signal to said at least one transmitting terminal and provide a select signal in response to said incorrect connection, and said inversion circuit is further configured to exchange said receiving and transmitting terminals in response to said select signal, wherein upon detection of said input signal on said transmitting terminal said at least one select signal disables said first and fourth transceivers and enables said second and third transceivers to exchange said receiving and transmitting terminals.