LINEAR FORECAST-Coding AUDIO USING AN IMPROVED ASSESSMENT OF PROBABILITY DISTRIBUTION

摘要

1. Based on a linear prediction, an audio decoder comprising: a probability distribution estimator (102) configured to determine, for each of a plurality of spectral components, a probability distribution estimate (28) from linear prediction coefficient information contained in a data stream (22), into which the audio signal is encoded; cascade (104) of entropy decoding and dequantization, configured to carry out entropy decoding and dequantization of the spectrum (26), composed of a referenced set of spectral components from a data stream (22) using a probability distribution estimate that is determined for each of said set of spectral components; an filter configured to generate a spectrum (26) according to a transfer function depending on a linear prediction synthesis filter determined by linear prediction coefficient information, and the probability distribution estimator is configured to determine a spectral fine structure from long-term prediction parameters contained in the data stream , and determine, for each of the aforementioned sets of spectral components, the probability distribution parameter s, so that the probability distributions of the spectral parameters follow a function that depends on the multiplicative spectral fine structure, wherein, for each of said plurality of spectral components, estimate the probability distribution function is parameterized parameterized using the distribution parameter