INFORMATION ENCODING METHOD, DECODING METHOD, COMMON MULTIPLIER ESTIMATION METHOD, DEVICE USING THESE METHODS, PROGRAM, AND RECORDING MEDIUM

Title:

INFORMATION ENCODING METHOD, DECODING METHOD, COMMON MULTIPLIER ESTIMATION METHOD, DEVICE USING THESE METHODS, PROGRAM, AND RECORDING MEDIUM

Document Type and Number:

WIPO Patent Application WO/2006/041165

Kind Code:

A1

Abstract:

There are provided a method for encoding signals by separating them by using a common multiplier so as to improve the compression efficiency of an audio signal and a method for obtaining a multiplier common to a numeric set including an error. A multiplier A common to each input signal sample x(i) is estimated for each frame. Each sample x(i) is divided by A and rounding is performed by the significant number of digits. A quotient obtained y(i) is encoded. The y(i) is multiplied by A and the multiplication result is subtracted from x(i) to determine a difference signal z(i), which is encoded. The A is encoded and the code of y(i), the code of z(i), and the code of A are combined and outputted. When estimating a common multiplier, each numeric value is divided by a decided representative value. Between the maximum value of difference of positive side and the maximum value of the difference of negative side, irreducible fractions are obtained by dividing each numeric value by a representative value of correct values and by rational approximation. Among the obtained irreducible fractions, the one having minimum denominator common to each numeric values is obtained and the common denominator is corrected by the representative value so as to be a common multiplier.

Inventors:

HARADA NOBORU (JP)
SEKIGAWA HIROSHI (JP)
MORIYA TAKEHIRO (JP)
SHIRAYANAGI KIYOSHI (JP)

Application Number:

PCT/JP2005/018978

Publication Date:

April 20, 2006

Filing Date:

October 14, 2005

Export Citation:

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Assignee:

NIPPON TELEGRAPH & TELEPHONE (JP)
HARADA NOBORU (JP)
SEKIGAWA HIROSHI (JP)
MORIYA TAKEHIRO (JP)
SHIRAYANAGI KIYOSHI (JP)

International Classes:

G06F5/00; G10L19/00; H03M7/30

Foreign References:

JPH11145843A	1999-05-28
JPH1078863A	1998-03-24

Other References: