MULTICHANNEL CODING AND DECODING Russian patent published in 2010 - IPC G10L19/00 

FIELD: information technology.

SUBSTANCE: coding device (1) for converting a first number (M) of input audio channels into a second smaller number (N) of output audio channels has at least one conversion unit (12) for converting a first signal (Lf; Rf; Co) and a second signal (Lr; Rr; Le) into a third signal (L; R; C) and a fourth signal (Ls; Rs; Cs). The third, main signal contains a large portion of the energy of the first and second signal, and the fourth, residual signal contains the remainder of the said energy. The coding device can use the third signal (L; R; C) to obtain an output signal and output the fourth signal (Ls; Rs; Cs). The decoding device (2) for converting a first number (N) of input audio channels into a second greater number (M) of output audio channels has at least one conversion unit (24) for converting a first signal (L; R; C) and a second signal (Ld; Rd; Ld) into a third signal (Lf, Rf; Co) and a fourth signal (Lr; Rr; Le). The first, main signal contains a large portion of the energy of the third and fourth signal, and the second, residual signal contains the remainder of the said energy. The coding device can receive at least one second signal (Ld; Rd; Cd).

EFFECT: high quality of decoding an audio signal.

15 cl, 13 dwg