【発明の名称】離散信号のコード化およびコード化された離散信号のデコード化のための各方法および各装置 - Fraunhofer Gesellschaft Tour Forderung der Angewanten Forschung A Fau

Title:

【発明の名称】離散信号のコード化およびコード化された離散信号のデコード化のための各方法および各装置

Document Type and Number:

Japanese Patent JP3420250

Kind Code:

B2

Abstract:

In a method of coding discrete time signals (X1) sampled with a first sampling rate, second time signals (x2) are generated using the first time signals having a bandwidth corresponding to a second sampling rate, with the second sampling rate being lower than the first sampling rate. The second time signals are coded in accordance with a first coding algorithm. The coded second signals (X2c) are decoded again in order to obtain coded/decoded second time signals (X2cd) having a bandwidth corresponding to the second sampling frequency. The first time signals, by frequency domain transformation, become first spectral values (X1). Second spectral values (X2cd) are generated from the coded/decoded second time signals, the second spectral values being a representation of the coded/decoded time signals in the frequency domain. To obtain weighted spectral values, the first spectral values are weighted by means of the second spectral values, with the first and second spectral values having the same frequency and time resolution. The weighted spectral values (Xb) are coded in accordance with a second coding algorithm in consideration of a psychoacoustic model and written into a bit stream. Weighting the first spectral values and the second spectral values comprises the subtraction of the second spectral values from the first spectral values in to obtain differential spectral values.

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Inventors:

Grill bernhard
Edler Bernd
Brandenburg Karl Heinz

Application Number:

JP53618198A

Publication Date:

June 23, 2003

Filing Date:

November 28, 1997

Export Citation:

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Assignee:

Fraunhofer Gesellschaft Tour Forderung der Angewanten Forschung A Fau

International Classes:

G10L19/24; H03M7/02; H04B14/04; G10L19/02; G10L; (IPC1-7): G10L19/02; G10L19/00; H04B14/04

Domestic Patent References:

JP9127987A
JP8263096A
JP964749A
JP695698A

Attorney, Agent or Firm:

Michihiro Okada

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