FIELD: information technology.
SUBSTANCE: invention relates to mixed time-domain/frequency-domain coding means for coding an input sound signal. Cut-off frequency for time-domain excitation contribution is also calculated in response to input sound signal, and a frequency extent of time-domain excitation contribution is adjusted in relation to said cut-off frequency. Following calculation of a frequency-domain excitation contribution in response to input sound signal, adjusted time-domain excitation contribution and frequency-domain excitation contribution are added to form a mixed time-domain/frequency-domain excitation constituting a coded version of input sound signal. In calculation of time-domain excitation contribution, input sound signal may be processed in successive frames of input sound signal and a number of sub-frames to be used in a current frame may be calculated.
EFFECT: faster processing of delay in classification of sound signal and its conversion into frequency domain.
54 cl, 6 dwg
