Method and apparatus to compensate a phase of a subwoofer channel signal

A method of compensating for a phase difference between a first speaker channel and a second speaker channel in an audio reproducing device, the method comprising:

• measuring a first frequency response from a first speaker that corresponds to the first speaker channel, a second frequency response from a second speaker that corresponds to the second speaker channel, and a combined frequency response from the first and second speakers;
• determining the phase difference according to the first and second frequency responses and the measured combined frequency response;
• and
• adjusting a phase of an input signal of one of the first and second speaker channels according to the determined phase difference.

An apparatus to compensate for a phase difference between a first speaker channel and a second speaker channel in an audio reproducing device, comprising:

• a data measuring unit to measure a first frequency response from a first speaker that corresponds to the first speaker channel, a second frequency response from a second speaker that corresponds to the second speaker channel, and a combined frequency response from the first and second speakers;
• a phase detector to determine the phase difference according to the first and second frequency responses and the measured combined frequency response;
• and
• a delay unit to adjust a phase of an input signal of one of the first and second speaker channels according to the determined phase difference.

A computer readable medium having executable code to compensate for a phase difference between a main speaker and a subwoofer in an audio reproducing device having separate subwoofer and main speaker channels, the medium comprising:

• a first code to measure a first response characteristic of a signal output from the subwoofer, a second response characteristic of a signal output from the main speaker, and a third response characteristic of a test signal simultaneously output from the subwoofer and the main speaker;
• a second code to detect a phase difference between the subwoofer and the main speaker according to a difference value between the first, second, and third response characteristics at a crossover frequency;
• a third code to calculate a delay value of the subwoofer according to the detected phase difference;
• and
• a fourth code to compensate for the detected phase difference at the crossover point between the subwoofer and the main speaker using the calculated delay value of the subwoofer.