Patent ID: 6504933
Filing Date: 2003-01-07
Classification: H04S

Abstract:
A three-dimensional sound system for providing a three-dimensional sound effect from a two-channel signal source having first and second signals comprising:a first high-pass filter for removing a direct current (DC) component from the first signal; a second high-pass filter for removing a DC component from the second signal; a first FIR filter which receives an output signal from the first high-pass filter and utilizes a modified (HRTF) M1(ejw) for re-localizing a first position of a sound source to a second position, wherein the first position is an original position of the sound source and the second position is a target position of the sound source; a second FIR filter which receives an output signal from the second high pass filter and utilizes a modified HRTF M2(ejw) for re-localizing a third position of a sound source to a fourth position, wherein the third position is an original position of the sound source and the fourth position is a target position of the sound source; a first gain controller for controlling gain of an output signal from the first FIR filter; and a second gain controller for controlling gain of an output signal from the second FIR filter; wherein the modified HRTF M1(ejw) is obtained by dividing HRTF Y1(ejw) of the second position by HRTF X1(ejw) of the first position; and the modified HRTF M2(ejw) is obtained by dividing HRTF Y2(ejw) of the fourth position by HRTF X2(ejw) of the third position.