INVERSE-NORMALIZATION DEVICE OF MULTICHANNEL AUDIO DECODER, AND INVERSE-NORMALIZATION METHOD USED THEREFOR

PROBLEM TO BE SOLVED: To convert each channel signal normalized to a specific level into an original size by receiving data A subjected to be inverse normalization, extracting inverse normalization information B to be multiplied with the data A from a storage means and multiplying the data A and the information B. SOLUTION: A control section 23 controls the entire section to store inverse normalization B to be multiplied with data A subjected to be inverse normalization and to store the data A to an input memory 24. A register 25 provides an output of the data A to the memory 24 properly synchronously with each other and a multiplexer 26 selects and outputs the information B corresponding to the data A among plural sets of information B stored in the ROM 21. A multiplier 22 multiplies the data A from the register 25 with the information B from the multiplexer 26 to store output data to an output a memory 29. Thus, each channel signal normalized to a specific level by multi-channel processing in converted into an original size by one multiplication to reduce the inverse normalization time.