FIELD: physics, measurement.
SUBSTANCE: invention relates to a method and device for quantisation of linear prediction parameters in audio signal coding at a variable bit rate, in which the input vector of the linear prediction parameters is accepted, the audio signal frame corresponding to the input vector of the linear prediction parameters is classified, the prediction vector is calculated, the calculated prediction vector is deleted from the input vector of the linear prediction parameters in order to create a prediction error vector, and the prediction error vector is quantised. The prediction vector calculation involves selection of one of the many prediction patterns concerning the audio signal frame classification and prediction error vector processing using the selected prediction pattern. The invention relates to a method and device for reverse quantisation of linear prediction parameters in audio signal decoding at a variable bit rate; in which at least one quantisation index and the audio signal frame classification data corresponding to the quantisation index are received, the prediction error vector is restored by applying the index to at least one quantisation table, the prediction vector is recreated, and the linear prediction parameter vector is created depending on the restored prediction error vector and the recreated prediction vector. The prediction vector recreation involves processing of the restored prediction error vector using one of the many prediction patterns depending on the frame classification data.
EFFECT: decrease in quantisation error quantity.
57 cl, 8 dwg
