FIELD: acoustics.
SUBSTANCE: invention relates to equipment for encoding and decoding an audio signal and generating control data from an audio signal. Determine a number of high frequency subband signals from a series of low frequency subband signals (602) associated with a low frequency audio signal (707) and from a set of target energies. In this case, control data (905) serves as a sign of the need to determine also a number of signals of high frequency subbands from a number of spectrum gain factors; and a number of spectrum gains are associated with the energy of the corresponding series of signals (602) of the low frequency subbands. Generate a wideband audio signal from a series of low frequency subband signals and a number of high frequency subband signals.
EFFECT: technical result is improved sound quality.
19 cl, 14 dwg
