SPLIT GAIN SHAPE VECTOR CODING

摘要

The invention relates to an encoder and a decoder and methods therein for supporting split gain shape vector encoding and decoding. The method performed by an encoder, where the encoding of each vector segment is subjected to a constraint related to a maximum number of bits, BMAX, allowed for encoding a vector segment. The method comprises, determining an initial number, Np—init of segments for a target vector x; and further determining an average number of bits per segment, BAVG, based on a vector bit budget and Np—init. The method further comprises determining a final number of segments to be used, for the vector x, in the gain shape vector encoding, based on energies of the Np—init segments and a difference between BMAX and BAVG. The performing of the method enables an efficient allocation of the bits of the bit budget over the target vector.

主权项

1. A method for supporting split gain shape vector encoding performed by a media encoder, where the encoding of each vector segment is subjected to a constraint related to a maximum number of bits, BMAX, allowed for encoding a vector segment, the method comprising:
for a target vector x:
determining an initial number, Np—init, of segments for the target vector x;determining an average number of bits per segment, BAVG, based on a vector bit budget and Np—init; anddetermining a final number of segments to be used in the gain shape vector encoding based on energies of the Np—init segments and a difference between BMAX and BAVG,thereby enabling an efficient allocation of the bits of the bit budget over the target vector.