FIELD: physics.
SUBSTANCE: device for generating a signal with an improved spectrum comprises: a signal generator for generating an extension signal from the main signal, wherein the extension signal comprises a frequency expansion range not included in the main signal, in which the extension signal timing portion comprises sub-range signals for a plurality of sub-ranges; a synthesis filter bank for generating the signal extended by frequency, using the extension signal, wherein the signal generator is configured to perform the energy restriction to ensure that the signal extended by frequency, obtained by the synthesis filter bank, is such that the energy of the more high-frequency range is at most equal to the energy in the low- frequency range or is greater than the energy of the high-frequency range, at most by the predetermined threshold.
EFFECT: improving the quality of fricatives in the audio signal.
18 cl, 18 dwg
