Title:
METHOD AND APPARATUS FOR REDUCTION OF QUANTIZED NOISE
Document Type and Number:
Japanese Patent JPH0629845
Kind Code:
A
Abstract:
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.
Inventors:
TORONGU TAO NIYUUYUEN
MAATEIN EFU BETAARI
MAATEIN EFU BETAARI
Application Number:
JP20729391A
Publication Date:
February 04, 1994
Filing Date:
July 25, 1991
Export Citation:
Assignee:
UNIV COLUMBIA
International Classes:
G05B21/02; H03M1/08; H03M1/12; H03M3/00; H03M3/02; (IPC1-7): H03M1/12; H03M1/08; H03M3/00
Attorney, Agent or Firm:
Akihide Sugimura (5 outside)
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