SPEECH DECODER SPEECH ENCODER SPEECH DECODING METHOD SPEECH ENCODING METHOD SPEECH DECODING PROGRAM AND SPEECH ENCODING PROGRAM

摘要

The audio decoding device 1 includes a non-multiplexer 1a, a low frequency band decoder 1b, a band division filter bank unit 1c, an encoded sequence analyzer 1d, and an encoded sequence decoder / dequantizer 1e. High frequency band generator 1h, low frequency band time envelope calculator 1f _{1 to} 1f _n for acquiring time envelopes of a plurality of low frequency bands, time envelope information, and time envelopes of a plurality of low frequency bands A time envelope calculator 1g for calculating a time envelope of the band, a time envelope adjuster 1i for adjusting the time envelope of a high frequency band component using the time envelope obtained by the time envelope calculator 1g, and band synthesis The filter bank part 1j is provided.