METHODS, ENCODER AND DECODER FOR LINEAR PREDICTIVE ENCODING AND DECODING OF SOUND SIGNALS UPON TRANSITION BETWEEN FRAMES HAVING DIFFERENT SAMPLING RATES Russian patent published in 2019 - IPC G10L19/12 G10L19/06 G10L19/26 

FIELD: speech analysis or synthesis; speech recognition.

SUBSTANCE: invention relates to means for linear predictive encoding and decoding of sound signals upon transition between frames having different sampling rates. Linear predictive filter parameters are converted from the first sampling rate S1 to the second sampling rate S2. Herewith, power spectrum of a LP synthesis filter is computed, at the sampling rate S1, using the LP filter parameters. Power spectrum of the LP synthesis filter is modified to convert it from the sampling rate S1 to the sampling rate S2. Modified power spectrum of the LP synthesis filter is inverse transformed to determine autocorrelations of the LP synthesis filter at the sampling rate S2. Autocorrelations are used to compute the LP filter parameters at the sampling rate S2.

EFFECT: technical result is the improved efficiency of encoding by LP-based codecs switching between two bit rates with different sampling rates.

34 cl, 5 dwg