Introduction

Masking Effect Analysis

Procedure

Access

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

  2. Choose Analysis/Masking Effect.

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

  4. Press OK

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

Analysis Parameters

  • Maximum Number of Peaks : maximum number of peaks in the output. The peaks selected are the peaks with the largest amplitude.

  • Threshold : attenuation below the peak amplitude. A peak is taken if its maximum is at least equal to this threshold above the neighboring minima.

    For instance, if the number of peaks is 20, with a 30 dB threshold, the 20 strongest peaks with an amplitude larger than 30dB above the two neighboring minima will be detected.

Data

The SDIF Converter application doesn't give access to the perceptual data of the analysis. The whole content of the file can be converted into a text file via SDIFToText. It contains 1 PIC frames and XPER matrices, with perceptual data :

  • Time and number of detected peaks

  • Peaks frequency

  • Spectral pitch estimation, as perceived by the listener

  • Peaks amplitude

  • Spectral weight of the components

  • Excess sound pressure level : perception threshold above the masking effect. A nil value means that the peak can't be perceived.

A propos...IRCAMRéalisé avec Scenari