US 2003/0076972 A1 · Sound field correction circuit

Abstract

The invention provides a sound field correction circuit for a surround playback apparatus wherein a decoding circuit is formed from a comparatively simple circuit and similar effects to those of a ordinary sound field correction circuit can be achieved at a reduced cost. A sound field correction circuit includes a decoding circuit for restoring 2-channel stereo signals encoded for a multi-channel surround effect to obtain multi-channel surround signals. The decoding circuit includes an adder for adding the encoded 2-channel stereo signals to each other, a subtractor for subtracting one of the encoded 2-channel stereo signals from the other, a level adjusting volume for adjusting the output level of the adder, and another level adjusting volume for adjusting the output level of the subtractor. An output of the level adjusting volume is used as a center channel signal while an output of the level adjusting volume 6 is used as a surround channel signal.

Claims10

Dependent claims

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, comprising:

inputting means for receiving at least a first signal and a second signal encoded for a multi-channel surround effect as input signals;
and
decoding means for decoding the first and second signals to produce multi-channel surround signals;
said decoding means including addition means for adding the first and second signals to produce a sum signal, and subtraction means for subtracting the second signal from the first signal to produce a difference signal.

1 more element

A sound field correction method wherein signals of at least 2 channels encoded for a multi-channel surround effect are received as input signals and multi-channel surround signals are outputted, comprising:

an inputting step of receiving at least a first signal and a second signal encoded for a multi-channel surround effect as input signals;
and
a decoding step of decoding the first and second signals to produce multi-channel surround signals;
the decoding step including an addition step of adding the first and second signals to produce a sum signal, and a subtraction step of subtracting the second signal from the first signal to produce a difference signal.

1 more element

Dependencies are inferred from the claim text.

Sound field correction circuit

Life of this patent

Sound field correction circuit

Life of this patent

Abstract

Claims10