Signal transmission system

A signal transmission system for transmitting a video signal through a transmission path, comprising:

• a signal transmission unit including;
• a decoder which receives digital broadcasting and outputs a luminance signal and two color difference signals,
• a time division multiplexing circuit which sub-samples the two color difference signals to signals with half pixel rates, subjects the signals to time division multiplexing, and outputs a multiplexed signal, and
• an encoding circuit which encodes the luminance signal and the multiplexed signal into signal forms suited to a transmission path, and transmits the encoded signals;
• and
• a signal reception unit including;
• a decoding circuit which receives the encoded luminance signal and multiplexed signal, and decodes these signals,
• a demultiplexing circuit which demultiplexes the decoded multiplexed signal into the original two color difference signals,
• a luminance signal processing circuit which processes the decoded luminance signal,
• a color difference signal processing circuit which processes the respective color difference signals demultiplexed, and
• a signal conversion circuit which converts the luminance signal outputted from the luminance signal processing circuit and the respective color difference signals outputted from the color difference signal processing circuit into RGB signals.

A signal transmission system for transmitting a video signal and an audio signal, comprising:

• a signal transmission unit including;
• an MPEG decoder which receives digital broadcasting and outputs the video/audio signal,
• an output interface which outputs the video/sound signal that has been outputted from the MPEG decoder,
• an I2C controller which outputs an I2C (Inter IC control) signal,
• a CPU which controls the whole unit, and
• a program ROM which stores an operation program of the CPU;
• and
• a signal reception unit including;
• an input interface which receives the video/audio signal from the signal transmission unit,
• a device interface which converts the video/audio signal into a video image and a sound,
• a video/audio output device which outputs the video image and the sound outputted from the device interface, to the outside, and
• an I2C controller which has a ROM table in which information relating to performance of the signal reception unit is stored, receives an I2C signal from the signal transmission unit, and outputs the information stored in the ROM table to the signal transmission unit according to a request from the signal transmission unit.