Player device and associated signal processing method

A player device, comprising:

• a multi-media receiving device, arranged to receive a multi-media signal, wherein the multi-media signal is a multi-sound channel signal, and at least comprises a multi-media sound component of a first sound channel and a multi-media sound component of a second sound signal;
• and
• a signal processing device, coupled to the multi-media receiving device, and arranged to receive the multi-media signal, and perform a mixing operation to mix the multi-media signal and a pseudo stereo signal to generate a mixed multi-media signal;
• wherein the signal processing device performs a stereo conversion operation on a system sound before the mixing operation is performed, to convert the system sound into the pseudo stereo signal;
• wherein in the stereo conversion operation, the signal processing device selects at least one frequency component of the system sound as a modulation signal, delays the modulation signal to generate a delayed modulation signal, and combines the delayed modulation signal and remaining frequency components of the system sound to generate the pseudo stereo signal, wherein the pseudo stereo signal at least comprises a system sound component of the first sound channel and a system sound component of the second sound channel;
• and
• wherein in the mixing operation, the signal processing device combines the multi-media sound component of the first sound channel and the system sound component of the first sound channel and combines the multi-media sound component of the second sound signal and the system sound component of the second sound channel, to generate the mixed multi-media signal.