ALLOCATION, BY SUB-BANDS, OF BITS FOR QUANTIFYING SPATIAL INFORMATION PARAMETERS FOR PARAMETRIC ENCODING

摘要

A method is provided for allocating bits for quantifying spatial information parameters by frequency sub-band for parametric encoding/decoding of a multichannel audio stream representative of a soundstage consisting of a plurality of sound sources. The method includes a step of quantifying or inversely quantifying, by frequency sub-band, spatial information parameters for the sound sources of the soundscape. The method further includes: assessing a spatial resolution of the current sub-band on the basis of the spectral properties of the sub-band; and determining a number of bits to be allocated to the current sub-band, the number of bits to be allocated being inversely proportional to the estimated spatial resolution. Also provided is a device for allocating quantification bits implementing the above-described method.

主权项

1. A method for allocating quantization bits for spatial information parameters per frequency sub-band, for a parametric coding or decoding of a multichannel audio stream representing a sound scene having a plurality of sound sources and including at least one of quantization or inverse quantization per frequency sub-band of spatial information parameters of the sound sources of the sound scene, wherein the method comprises the following steps;
estimation by an allocation device of a spatial resolution of a current sub-band on the basis of spectral properties of the sub-band; and determination by the allocation device of a number of bits to be allocated to the current sub-band, the number of bits to be allocated being inversely proportional to the estimated spatial resolution.