FIELD: physics.
SUBSTANCE: invention relates to means for making decisions regarding control of harmonic filtration tools. Determining main tone (18) of audio signal (12) to be processed by the audio codec. Harmonic index (22) of audio signal (12) is determined using fundamental tone (18). Depending on fundamental tone (18), determining at least one time structure indicator (26) which measures the time structure of the audio signal. Tool (30) of harmonic filtering is controlled depending on indicator (26) of time structure and indicator (22) of harmonicity.
EFFECT: technical result consists in improved efficiency of coding.
27 cl, 21 dwg
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