Advertisement

Removing the Influence of Shimmer in the Calculation of Harmonics-To-Noise Ratios Using Ensemble-Averages in Voice Signals

  • Carlos Ferrer
  • Eduardo González
  • María E. Hernández-Díaz
  • Diana Torres
  • Anesto del Toro
Open Access
Research Article
  • 1.2k Downloads
Part of the following topical collections:
  1. Analysis and Signal Processing of Oesophageal and Pathological Voices

Abstract

Harmonics-to-noise ratios (HNRs) are affected by general aperiodicity in voiced speech signals. To specifically reflect a signal-to-additive-noise ratio, the measurement should be insensitive to other periodicity perturbations, like jitter, shimmer, and waveform variability. The ensemble averaging technique is a time-domain method which has been gradually refined in terms of its sensitivity to jitter and waveform variability and required number of pulses. In this paper, shimmer is introduced in the model of the ensemble average, and a formula is derived which allows the reduction of shimmer effects in HNR calculation. The validity of the technique is evaluated using synthetically shimmered signals, and the prerequisites (glottal pulse positions and amplitudes) are obtained by means of fully automated methods. The results demonstrate the feasibility and usefulness of the correction.

Keywords

Information Technology Quantum Information Speech Signal Ensemble Average Full Article 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Publisher note

To access the full article, please see PDF.

Copyright information

© Carlos Ferrer et al. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Carlos Ferrer
    • 1
  • Eduardo González
    • 1
  • María E. Hernández-Díaz
    • 1
  • Diana Torres
    • 1
  • Anesto del Toro
    • 1
  1. 1.Center for Studies on Electronics and Information TechnologiesCentral University of Las VillasSanta ClaraCuba

Personalised recommendations