Signal transmission system

A signal transmission system including a transmission apparatus and a reception apparatus comprising:

• the transmission apparatus including:
• a first portion that converts a video signal into differential signals, converts a vertical synchronization signal into a common mode signal, and transmits a signal in which the converted differential signals and the converted common mode signal are superimposed to the reception apparatus via a pair of signal lines in a network cable;
• and
• a second portion that converts only a horizontal synchronization signal into differential signals, converts a first console signal into a common mode signal, transmits the converted differential signals and the converted common mode signal to the reception apparatus via a single pair of signal lines in the network cable, and receives a second console signal which has been converted into a common mode signal, from the reception apparatus via the single pair of signal lines in the network cable;
• and
• the reception apparatus including:
• a third portion that receives the superimposed signal from the first portion via the pair of signal lines, restores the differential signals in the received signal to the video signal, and restores the common mode signal in the received signal to the vertical synchronization signal;
• and
• a fourth portion that receives the signal from the second portion via the single pair of signal lines, restores the differential signals in the received signal to the horizontal synchronization signal, restores the common mode signal in the received signal to the first console signal, converts the second console signal into a common mode signal, and transmits the converted common mode signal to the transmission apparatus via the single pair of signal lines.