Patent ID: 7218740

Claim:
An audio system for reproducing six independent original audio signals at six reproduction points in an audio space, wherein said six independent original audio signals are a center signal reproduced at front center in the audio space, left and right front signals reproduced at front left and right sides in the audio space, left and right rear signals reproduced at rear left and right sides in the audio space, and a bass audio signal, the audio system comprising: a first processing portion for producing a first processed sound signal by delaying and attenuating an amplitude level of one of the left and right front signals in accordance with a distance between the reproduction point of said one of the left and right front signals and the reproduction point of one of the left and right rear signals; a second processing portion for producing a second processed sound signal by delaying and attenuating an amplitude level of one of the left and right rear signals in accordance with a distance between the reproduction point of said one of the left and right rear signals and the reproduction point of one of the left and right front signals; a first adding portion for adding said first processed sound signal to said one of the left and right rear signals; and a second adding portion for adding said second processed sound signal to said one of the left and right front signals; wherein said first and second processing portions attenuate the respective amplitude level in accordance with a predetermined stereo audio effect.