| 摘要 |
PURPOSE: To reduce quantization noise in quantization digital data that is performed over sampling by alternately performing LPF processing and code projecting processing processes when a set of discrete-time signals is a convex set. CONSTITUTION: A computer system 10 has a memory means M and calculating means S and T, and each of them execute conversion. The means S and T comprises a hardware, form ware or software. Furthermore, it comprises a 1st estimating inputting means 11, an inputting means 12 of a band limited frequency fm, an inputting means 13 of a quantization signal input data C<(0)> and an outputting means 14 of noise reducing output data (e). When a set of discrete-time signals that correspond to signal data that is quantized is a convex set, processes of a LPF and code projecting processing are alternately performed. This can further reduce quantization noise in quantization digital data which is performed over sampling.
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