kompressionseinrichtung for transformiertes, digital audio signal with adaptive quantization based on a psycho acoustic criterion.

摘要

The field of the invention is that of digital audio signal compression. The invention applies in particular to the transmission of sound signals on digital channels, and to devices for storing digital sound signals. The invention relates to an apparatus for compressing an audiodigital signal, using an apparatus for allocating bits which are available for transmission or storage of the signal, driving means of adaptive quantisation of the signal, so as to permit a significant reduction in the throughput whilst preserving to the maximum the quality of the starting signal. According to the invention, the apparatus comprises means (16) of allocating a specific number of bits in order to express the coefficients of each frequency band of a transformed audiodigital signal (12) as a function of an auxiliary item of information (19) corresponding to a description of the spectrum of the said signal (12), the said apparatus being informed by means (14) of prior elimination of spectral components of the said transformed signal (12) as a function of a psycho-acoustic criterion. IMAGE