QUANTIZATION STEP PARAMETER DECISION APPARATUS, QUANTIZATION STEP PARAMETER DECISION METHOD, QUANTIZATION STEP PARAMETER DECISION PROGRAM, AND NONLINEAR QUANTIZATION METHOD, NONLINEAR QUANTIZATION APPARATUS, AND NONLINEAR QUANTIZATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a quantization step parameter decision apparatus, a quantization step parameter decision method, a quantization step parameter decision program whereby the number of quantization processing times can be decreased and to provide a nonlinear quantization method, a nonlinear quantization apparatus, and a nonlinear quantization program whereby upsizing of the circuit scale can be suppressed and high speed processing can be attained. SOLUTION: The quantization step parameter decision apparatus 1 for calculating the quantization step parameter for a nonlinear quantization apparatus is provided with: a quantization means 2 for performing quantization by the quantization step parameter of a preceding granule; a comparison means 3 for comparing the number of bits being a value obtained by the quantization means 2 with the specified number of bits; a same time processing means 4 for adopting the quantization step parameter when the number of bits is the same as the specified number of bits as a result of the comparison; a greater state processing means 5 for incrementing the quantization step parameter one by one each to obtain and adopt a maximum value of the specified number of bits or below when the number of bits is greater than the specified number of bits as a result of the comparison; and a smaller state processing means 6 for decreasing the quantization step parameter to obtain a maximum value being the specified number of bits or below and to adopt it when the number of bits is smaller than the specified number of bits as a result of the comparison. COPYRIGHT: (C)2004,JPO