METHOD AND SYSTEM USING A LONG-TERM CORRELATION DIFFERENCE BETWEEN LEFT AND RIGHT CHANNELS FOR TIME DOMAIN DOWN MIXING A STEREO SOUND SIGNAL INTO PRIMARY AND SECONDARY CHANNELS.

摘要

A stereo sound signal encoding method and system for time domain down mixing right and left channels of an input stereo sound signal into primary and secondary channels, determine normalised correlations of the left channel and right channel in relation to a monophonic signal version of the sound. A long-term correlation difference is determined on the basis of the normalised correlation of the left channel and the normalised correlation of the right channel. The long-term correlation difference is converted into a factor ß, and the left and right channels are mixed to produce the primary and secondary channels using the factor ß, wherein the factor ß determines respective contributions of the left and right channels upon production of the primary and secondary channels.