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Method for restoring partials of a sound signal

A sound signal and harmonic frequency technology, which is applied in the field of digital processing of sound signals, can solve the problem of inability to control the induction frequency, etc., and achieve the effect of low-complexity algorithm

Inactive Publication Date: 2007-03-21
FRANCE TELECOM SA
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AI Technical Summary

Problems solved by technology

These techniques ensure phase continuity between the existing peak and the recovered peak, but cannot control the induced frequency induced by equations (3) and (5)

Method used

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  • Method for restoring partials of a sound signal
  • Method for restoring partials of a sound signal
  • Method for restoring partials of a sound signal

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Embodiment Construction

[0036] Method 1 of the invention is carried out in the manner described below with reference to the flow chart of FIG. 1 . The method consists in recovering the peak P whose frequency ω and phase  are known i and peak P i+N harmonics between them.

[0037] In a first step 2, the method estimates the missing peak P, for example by linear prediction or interpolation methods known in the art i+1 to P i+N-1 the frequency of each and magnitude A.

[0038] Consider including a chain of connected peaks P i (A i , ω i ,  i ) harmonic frequency, P i (A i , ω i ,  i ) is known at time iT and is characterized by:

[0039] A i , the amplitude of the peak at time iT;

[0040] ω i , the frequency of the peak at time iT; and

[0041]  i , the phase of the peak at time iT modulo 2π.

[0042] Using e.g. ω i with ω i+N , or e.g. the paper "Enhanced PartialTracking using linear Prediction", Mathieu Lagrange, Sylvain Marchand, Martin Raspaud and Jean-Bernard Rault, Proce...

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Abstract

The method involves estimating frequency and amplitude of each missing peak of a partial of a sound signal. The estimation is effectuated using interpolation or linear prediction method. A phase shifted from initial peak to final peak is calculated for each estimated frequency. A phase error between the shifted phase and a phase known at the final peak is calculated. Each shifted phase is corrected according to the phase error. - Independent claims are also included for the following: - (A) a sound signal synthesis device for implementation of partials restoration method - (B) a computer program product directly loadable in an internal memory of a device or group of devices comprise portions of logical code for execution of partials restoration method - (C) a medium usable in a device or group of devices is stored with a computer program product.

Description

technical field [0001] The invention relates to the field of communication, in particular to the fields of digital processing of sound signals and harmonic representation of sound signals. Background technique [0002] In harmonic modeling of digital audio signals, the sound signal is represented by a set of oscillators whose parameters (frequency, amplitude, phase) vary slowly over time. Harmonic analysis involves short-term time / frequency analysis to determine the values ​​of these parameters, followed by peak extraction and partial tracking. [0003] The signal to be modeled is divided into frames of / samples (typically / = 1024). A short-term time / frequency analysis module (typically performing a Fourier transform) computes the short-term spectrum of the signal for each frame. The module for extracting peaks only keeps a priori the most relevant peaks, eg one criterion is to keep only the highest energy peaks. The third and last module tries to connect peaks to each ...

Claims

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Application Information

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IPC IPC(8): G10L19/00G10L19/08G10L19/005G10L19/093
CPCG10L19/005G10L19/093G10L19/02G10L19/06
Inventor 让-伯纳德·劳尔特马蒂厄·拉格兰奇
Owner FRANCE TELECOM SA
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