Acoustic signal coding device, acoustic signal decoding device, acoustic signal coding method, and acoustic signal decoding method

摘要

The acoustic signal encoding device (100) includes a time-frequency conversion unit (101) that outputs a subband spectrum from an input signal, a subband energy quantization unit (102), and a tonality calculation that analyzes the tonal nature of the subband spectrum. Part (103), the second subband to be quantized by the second quantizer based on the tonal analysis result and the quantization subband energy, and the first subband to be quantized by the first quantizer A bit allocation unit (104) for determining the first number of bits allocated to the first bit, a first quantization unit (106) for encoding using a bit consisting of the first number of bits, and encoding using a pitch filter A second quantizing unit (107); and a multiplexing unit (108).