US 2010/0145682 A1 · Method and Related Device for Simplifying Psychoacoustic Analysis with Spectral Flatness Characteristic Values

Abstract

The present invention applies spectral flatness characteristic values to simplify psychoacoustic analysis of a sound signal. If the sound signal comprises a plurality of frames, the present invention calculates the energy of the sound signal in a frequency domain, calculates a plurality of spectral flatness, and decides to use a short-block or a long-block Modified Discrete Cosine Transform accordingly. If the sound signal comprises left and right channel signals, the present invention performs psychoacoustic analysis on the sound signal to count energy of the left and right channel signals in a frequency domain, counts spectral flatness of the left and right channel signals, and decides to use middle/side transform or left and right channel encoding to transform the left and right channel signals accordingly.

Claims15

Dependent claims

A method of simplifying psychoacoustic analysis with spectral flatness characteristic values comprising:

calculating energy of a plurality of frames of a sound signal in a frequency domain;
calculating a plurality of spectral flatness according to the energy of the plurality of frames in the frequency domain;
and
using a short-block or a long-block Modified Discrete Cosine Transform (MDCT) for transforming each frame of the plurality of frames according to the plurality of spectral flatness.

1 more element

A method of simplifying psychoacoustic analysis with spectral flatness comprising:

calculating energy of a left and a right channel signals of a sound signal in a frequency domain;
calculating spectral flatness of the left and the right channel signals according to the energy of the left and the right channel signals in the frequency domain;
using a middle/side (M/S) transform or left and right channel encoding to transform the left and the right channel signals according to the spectral flatness of the left and the right channel signals.

Dependencies are inferred from the claim text.

Facts

Application

12/412,382Filed 27 Mar 2009

Priority

CN 200810178895.28 Dec 2008

Published

10 Jun 2010

Term ends

Not estimatedThe source records don’t support an estimate.

Classification7 codes

G10L 19/025
Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring: detection of transients or attacks for time/frequency…
G10L 19/008
Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals,…:…
G10L 19/0212
Using spectral analysis, e.g. transform vocoders or subband vocoders: using orthogonal transformation
G10L 19/03
Using spectral analysis, e.g. transform vocoders or subband vocoders: spectral prediction for preventing pre-echo; Temporary noise shaping [TNS],…

Method and Related Device for Simplifying Psychoacoustic Analysis with Spectral Flatness Characteristic Values

Life of this patent

Method and Related Device for Simplifying Psychoacoustic Analysis with Spectral Flatness Characteristic Values

Life of this patent

Abstract

Claims15