Digital-to-analog conversion apparatus and method having signal calibration mechanism

A digital-to-analog conversion method having signal calibration mechanism used in a digital-to-analog conversion apparatus, comprising:

• performing conversion according to a signal feeding related to an input digital signal having an input codeword to generate an output analog signal and an echo-canceling analog signal by a digital-to-analog conversion circuit such that the echo-canceling analog signal at least performs output echo-canceling on the output analog signal at an echo path, wherein the digital-to-analog conversion circuit comprises a plurality of conversion circuits operating at a first frequency;
• performing signal processing that includes down-sampling on the echo path to generate an echo signal having a second frequency by an echo transmission circuit, wherein the second frequency is a half of the first frequency;
• performing mapping according to a plurality of offset tables and performing processing according to a plurality groups of response coefficients on the signal feeding related to an odd input part and an even input part of the input digital signal respectively by an echo calibration circuit, to generate an odd calibration part and an even calibration part of an echo-canceling calibration signal, wherein the echo calibration circuit comprises an odd calibration circuit and an even calibration circuit operating at the second frequency and corresponding to the conversion circuits that generate the echo-canceling analog signal;
• generating a plurality offsets according to an error signal between the echo signal and the echo-canceling calibration signal and path information related to the echo calibration circuit by a calibration parameter calculation circuit operating at the second frequency;
• and
• making the groups of response coefficients converge according to the error signal and pseudo noise transmission path information from the digital-to-analog conversion circuit to the echo transmission circuit, and further updating the offset tables according to the offsets by the echo calibration circuit.