FIELD: speech analysis or synthesis; speech recognition.
SUBSTANCE: invention relates to signal processing. Technical result is achieved by forming, in the speech encoder, a residual signal of the high frequency band based on a part of the high frequency band of the audio signal; generating a harmonically extended signal at least partially based on a low-band portion of the audio signal; determining a mixing factor based on the high-band residual signal, harmonically extended signal and modulated noise, the modulated noise is at least partially based on the harmonically extended signal and white noise; and combining the first signal corresponding to the harmonically extended signal scaled based on the reduction ratio, and a second signal corresponding to the modulated noise scaled based on the reduction ratio.
EFFECT: technical result is to improve the efficiency of signal processing.
56 cl, 6 dwg
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