Patent ID: 8036389

Claim:
An apparatus to cancel a vocal component from an audio signal, comprising: a first vocal canceling unit to delay each of left and right channel input signals for a predetermined time and to feed-forward cross mix the delayed left and right channel input signals with the right and left channel input signals to generate left and right channel signals; a sound stage widening unit to delay each of the left and right channel signals output from the first vocal canceling unit for a predetermined time and to feedback-cross mix the delayed left and right channel signals with the right and left channel signals to generate second left and right channel signals; and a second vocal canceling unit including a left and right low pass filter directly connected to the sound stage widening unit to low-pass filter the second left and right channel signals and restrict a high frequency component output from the sound stage widening unit, the second vocal canceling unit including a high-pass filter to output a high frequency component of a difference between the second left and right channel signals to cancel a second vocal component, and to mix the low-pass filtered left and right channel signals of low frequency components output from the low pass filters with the high-pass frequency component output from the high-pass filter to generate a final left and right channel signals.