Introduction

Peak Analysis

General Principles

Peak Detection

At each FFT frame, amplitude maxima are detected in the short terme amplitude spectrum.

Data

The resulting sdif file contains 1PIC frames. These frames are a standard type of sdif matrix dedicated to sinusoidal modeling. The data correspond to a constant sinusoid producing a peak in the frequency estimate. Information is displayed in several rows.The matrix contains information about the

  • temporal location in ms.

  • frequency

  • amplitude

  • phase, relatively to the center of the window.

Converting SDIF Files into Text Files

Basic Procedure

Basic Procedure

  1. You can possibly select the region you want to analyse, with a click and drag.

  2. Choose Analysis/Peak Analysis.

  3. In the dialogue window, specify the analysis parameters.

  4. Press OK

In the dialogue window, specifiy a name and location for the file.

Peak Analysis Parameters

  • Threshold in dB : minimum amplitude difference between peaks and neighbour minimum values. By default, the threshold is set to -95 dB – the audibility threshold is equal to -120 dB –. A 0 dB threshold amounts to detecting all peaks.

  • Maximum Number of Peaks : an n number of peaks to detect in each analysis window. By default, 3 peaks are detected in each analysis window.

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