To provide a digital audio decoder which permits changing of musical tones relating to pitch, such as pitch conversion and effect impartation, for every channel without drastically increasing the scale of circuits including a memory.

Reverse quantization circuits 21-1, 21-2, etc., reverse quantize the respective subband samples of the bit stream data of sound sources 20-1, 20-2, etc., for every subband. Time serialization processing circuits 22-1, 22-2 etc., convert the respective subband outputs of the reverse quantization circuits 21-1, 21-2, etc., to time serialization data. Pitch conversion circuits 23-1, 23-2, etc., perform the pitch conversion of the outputs of the time serialization processing circuits 22-1, 22-2 etc. A channel mixing circuit 24 mixes the outputs of the pitch conversion circuits 23-1, 23-2, etc. A filter processing circuit 25 performs the filter processing of the output of the channel mixing circuit 24.

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