The embodiment of the invention provides an audio/voice coding device and an audio/voice decoding device. The audio/voice coding device comprises a conversion unit for converting time domain input signals into time domain signals; a band frequency dividing unit used for dividing frequency spectrums of input signals into a plurality of sub-bands; a norm factor calculating unit which can conduct norm factors representing grades of energy of each sub-band; a quantization unit for quantizing the norm factors; an index changing unit used for changing quantized indexes; a Huffman table selecting unit used for selecting a Huffman table from a plurality of predefined Huffman tables; a Huffman coding unit comprising a difference index calculating unit used for calculating a current sub-band and a prior sub-band, using a selected Huffman table for coding a difference index; and a marking signal transmission unit used for transmitting marking signals of a selected Huffman table.