Signal transceiving system and signal receiver thereof

A signal transceiving system, comprising:

• a signal transmitter, comprising:
• a first data buffer receiving currently transmitted data and providing previously transmitted data;
• a comparator, coupled to the first data buffer, for receiving the currently transmitted data, receiving the previously transmitted data from the first data buffer, and comparing, in a first mode, the previously transmitted data with the currently transmitted data to generate a data variation information;
• and
• an encoder, coupled to the comparator, for generating, in the first mode, at least one index value and a corresponding instruction signal according to the data variation information;
• wherein the signal transmitter sends the at least one index value which is a serial signal and the instruction signal,
• wherein the encoder is in the first mode and generates at least one update datum corresponding to the at least one index value according to the data variation information and the currently transmitted data.