ALTERNATING FRAME LENGTH ENCODING OPTIMIZED FOR PRECISION Russian patent published in 2007 - IPC G10L19/00 H04S5/00 

FIELD: encoding of audio-signals, in particular, encoding of multi-channel audio signals.

SUBSTANCE: in accordance to the invention, polyphonic signals are used for creation of main signal, typically, a signal and a collateral signal. A row of encoding schemes of collateral signal (x_side) is implemented, each encoding scheme is characterized by a set of sub-frames of varying length, while total length of sub-frames corresponds to encoding frame length of encoding scheme. Encoding scheme for collateral signal (x_side) is selected on basis of current content of polyphonic signals, and collateral remainder signal is created as a difference between collateral signal and main signal, scaled with usage of balancing coefficient, which is selected for minimization of collateral remainder signal. Optimized collateral remainder signal and balancing coefficient are encoded and implemented as encoding parameters, representing the collateral signal.

EFFECT: increased quality of perception of multi-channel sound signals.

5 cl, 15 dwg