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Method for analyzing signals providing instantaneous frequencies and sliding fourier transforms, and device for analyzing signals

A technology of frequency conversion and analysis methods, applied in speech analysis, special data processing applications, instruments, etc., can solve problems such as blocking

Active Publication Date: 2013-06-12
伊夫列扎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] This stable or quasi-stable assumption is largely honored, but prevents seeing transitions between periods during which the signal is stable (or quasi-stable)

Method used

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  • Method for analyzing signals providing instantaneous frequencies and sliding fourier transforms, and device for analyzing signals
  • Method for analyzing signals providing instantaneous frequencies and sliding fourier transforms, and device for analyzing signals
  • Method for analyzing signals providing instantaneous frequencies and sliding fourier transforms, and device for analyzing signals

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Embodiment Construction

[0121] In different drawings, the same reference signs indicate the same or similar parts.

[0122] 1) Overview of the present invention

[0123] The purpose of the method according to the invention is to carry out the analysis using a filter bank operating with a plurality (NF) of frequency selective filters (FS) with different center frequencies (FN) for a sampling frequency (FE) operates on samples of the actual input signal (SE) acquired at , which provide instantaneous frequency and amplitude information as well as information that allows a sliding Fourier transform to be performed simultaneously.

[0124] The method specifically includes the following four steps:

[0125] a) a preprocessing operation to transform samples of the input signal (SE) into a sequence of samples (SM);

[0126] b) a plurality of (NF) frequency transform operations (TFE), each frequency transform operation (TFE) corresponding to one of the analyzed frequencies (FN) in the plurality of (NF) fr...

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Abstract

The present invention relates to a method for analyzing an initial signal (SI) representative of a wave that propagates in a physical medium, in order to provide parameters characteristic of said initial signal, wherein the method is implemented via a computing platform (PC) requiring only fixed-point calculations with a reduced number of multiplications. The provided parameters may be one or more of the following: instantaneous phase (PI), instantaneous amplitude (AI), instantaneous frequency (FI), and sliding Fourier transform (TFG).

Description

Background technique [0001] Methods for extracting information from audio signals, especially music and speech signals, are becoming increasingly important. In particular, these methods are used in an increasing number of applications such as: speech recognition, music signal analysis, detection of traffic signals for telephony applications with speech signals (DTMF in English literature). [0002] More precisely, these applications consist of a step of extracting frequency domain information (typically: amplitude and amplitude evolution of a narrow frequency band extracted from the signal), followed by an identification or discrimination step using this frequency domain information (often as primary information). These two steps use different techniques: the first uses signal processing and the second uses pattern recognition. The step of extracting information in the frequency domain is often carried out by means of a sliding Fourier transform (TFG: STFT, short-time Fourier...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14G10L25/48G10L25/24
CPCG06F17/141G10L25/24G10L25/48G10L19/008G10L25/90H04S1/007G06F17/14
Inventor 伊夫·列扎
Owner 伊夫列扎
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