ENCODER, DECODER AND METHOD FOR ENCODING AND DECODING Russian patent published in 2018 - IPC G10L19/08 G10L19/32 

FIELD: information technology.

SUBSTANCE: invention relates to encoding and decoding means. Encoder for encoding an audio signal into a data stream comprises a predictor, a factoriser, a transformer and a quantise and encode stage. Predictor is configured to analyse the audio signal in order to obtain prediction coefficients describing a spectral analogue of the audio signal or a fundamental frequency of the audio signal, and subject the audio signal to an analysis filter function dependent on the prediction coefficients in order to output a residual signal of the audio signal. Factoriser is configured to apply a matrix factorisation onto an autocorrelation or covariance matrix of synthesis filter function defined by the prediction coefficients. Transformer is configured to transform the residual signal based on the factorised matrices. Quantise and decode stage is configured to quantise the transformed residual signal to obtain a quantised transformed residual signal or an encoded quantised transformed residual signal.

EFFECT: technical result consists in improvement of efficiency of coding.

23 cl, 7 dwg, 4 tbl