Patent ID: 6850622
Filing Date: 2005-02-01
Classification: H04S

Abstract:
1. A sound field correction circuit which receives signals of at least 2 channels encoded for a multi-channel surround effect as input signals and outputs multi-channel surround signals, consisting of: inputting means for receiving a first signal and a second signal encoded for a multi-channel surround effect as input signals; decoding means for decoding the first and second signals to produce multi-channel surround signals; said decoding means including a first level adjustment means for adjusting the first signal and outputting a first adjusted first signal; a second level adjustment means for adjusting the second signal and outputting a first adjusted second signal; a third level adjustment means for adjusting the first signal and outputting a second adjusted first signal; and a fourth level adjustment means for adjusting the second signal and outputting a second adjusted second signal; an adder for adding the first adjusted first signal and first adjusted second signal to produce a sum signal; and a subtractor for subtracting the second adjusted first signal and second adjusted second signal to produce a difference signal; and a virtualizer for receiving the first signal, the second signal, the sum signal and the difference signal and outputting a desired number of channels of surround signals; whereby the sound field correction circuit is a simple and low-cost circuit for producing multi-channel surround signals.