PURPOSE: To suppress a quantization error even when the number of quantization bits are less by performing sound compression processing and including information showing whether or not the quantized data are the original speech data itself in the compressed data. ;CONSTITUTION: The presence of the necessity of refreshing is decided by a refreshment decision device 2 by using a difference value between the original sound data 1 and a predictive value outputted from a predictor 8, and refreshment decision information is inputted to a compression data forming device 9. Further, a numerical value after being quantized by a quantizer 3 is inversely quantized by an inverse quantizer 4. The numerical value after being quantized by the quantizer 5 is inversely quantized by the inverse quantizer 6. Then, the processing performed by a data selector 7 for predictor input is that one side between the numerical value after being inversely quantized by the inverse quantizer 4 and the numerical value after being inversely quantized by the inverse quantizer 6 is selected as the numerical value to be inputted to the predictor 8. Further, the selection in the selector 7 is performed according to refreshment decision information from the decision device 2.;COPYRIGHT: (C)1996,JPO
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