Signal transmission device performing compensation by filtering characteristics and method thereof, and signal reception device offsetting compensation and method thereof

A signal reception device offsetting compensation, comprising:

• an analog front-end circuit to generate a reception signal according to a transmission signal which is compensated previously;
• and
• a level recovery circuit to perform level adjustment to the reception signal or the derived signal thereof which is above a signal level top or below a signal level bottom and thereby generate a pulse amplitude modulation (PAM) signal with a signal level between the signal level top and the signal level bottom,
• wherein the signal level of the PAM signal corresponds to one of 2M+1 signal levels;
• if the signal level of the reception signal or the derived signal thereof exceeds the signal level top, the level recovery circuit lowers the signal level of the reception signal or the derived signal thereof for n×(2M+1) levels;
• and if the signal level of the reception signal or the derived signal thereof is below the signal level bottom, the level recovery circuit raises the signal level of the reception signal or the derived signal thereof for n×(2M+1) levels in which the n and the M are positive integers while the n is adjustable.

A signal transmission method performing compensation by filtering characteristics, which generates a transmission signal according to a source signal and is carried out through a signal transmission device performing compensation by filtering characteristics, comprising:

• generating a compensation signal according to a source signal and a filtering function;
• filtering the compensation signal according to the filtering function to thereby generate a filtered signal;
• and
• generating the transmission signal according to the filtered signal.

A signal reception method offsetting compensation, which receives a transmission signal and is carried out by a signal reception device capable of offsetting compensation, comprising:

• generating a reception signal according to the transmission signal;
• if the signal level of the reception signal or the derived signal thereof is above a signal level top, lowing the signal level of the reception signal or the derived signal thereof for n×(2M+1) levels to thereby generate a pulse amplitude modulation (PAM) signal in which the n and the M are positive integers while the n is adjustable;
• and
• if the signal level of the reception signal or the derived signal thereof is below signal level bottom, raising the signal level of the reception signal or the derived signal thereof for n×(2M+1) levels to thereby generate the PAM signal,
• wherein the signal level of the PAM signal is between the signal level top and the signal level bottom.