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SPEECH DECODER, SPEECH ENCODER, SPEECH DECODING METHOD, SPEECH ENCODING METHOD, STORAGE MEDIUM FOR STORING SPEECH DECODING PROGRAM, AND STORAGE MEDIUM FOR STORING SPEECH ENCODING PROGRAM
SPEECH DECODER, SPEECH ENCODER, SPEECH DECODING METHOD, SPEECH ENCODING METHOD, STORAGE MEDIUM FOR STORING SPEECH DECODING PROGRAM, AND STORAGE MEDIUM FOR STORING SPEECH ENCODING PROGRAM
A speech decoder includes a demultiplexing unit, a low frequency band decoding unit, a band splitting filter bank unit, a coded sequence analysis unit, a coded sequence decoding/dequantization unit, a high frequency band generation unit, low frequency band time envelope calculation units that acquire a plurality of low frequency band time envelopes, a time envelope calculation unit that calculates high frequency band time envelopes using time envelope information and the plurality of low frequency band time envelopes, a time envelope adjustment unit that adjusts the time envelope of high frequency band components using the time envelopes obtained by the time envelope calculation unit, and a band synthesis filter bank unit.
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