| 摘要 |
PROBLEM TO BE SOLVED: To reduce the effects of a transmission error or packet loss by deforming an error spread over hierarchies, in bit rate scalable encoding and decoding, based on hierarchical quantization such as controlling of an amplitude. SOLUTION: A signal, deformed into input signal by a first deformation function, is inputted to the quantizer of the first hierarchy, a quantized code and a signal reconstituted by inverse quantization are outputted, the error signal calculator of the first stage outputs an error d1 (f) between the input signal and the signal reconstituted on the first stage, the quantizer of the next hierarchy inputs a signal deformed into error signal d1 (f) by a second deformation function and outputs the quantized code of that hierarchy and the signal reconstituted by inverse quantization, the error signal calculator of the second stage outputs an rear d2 (f) between the sum of the signal reconstituted on the first hierarchy, and the signal reconstituted on the second hierarchy and the input signal and the errors deformed on the high-order hierarchies, are similarly successively quantized on multiple stages.
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