FIELD: physics.
SUBSTANCE: encoder can downsample the input signal, perform basic encoding of the input signal with reduced sampling, perform the frequency conversion of the input signal and perform the bandwidth extension encoding using the base signal of the input signal in the frequency domain.
EFFECT: extending the high-frequency range by extracting the main signal of the input signal and adjusting the energy of the input signal using the tonality of the high-frequency range of the input signal and the key tone.
7 cl, 38 dwg
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