Formant-tracking linear prediction models for speech processing in noisy environments

Q. Yan, S. V. Vaseghi, E. Zavarehei, B. P. Milner

Research output: Contribution to conferencePaper

5 Citations (Scopus)

Abstract

This paper presents a formant-tracking method for estimation of the time-varying trajectories of a linear prediction (LP) model of speech in noise. The main focus of this work is on the modelling of the non-stationary temporal trajectories of the formants of speech for improved LP model estimation in noise. The proposed approach provides a systematic framework for modelling the interframe correlation of speech parameters across successive frames, the intra-frame correlations are modelled by LP parameters. The formant-tracking LP model estimation is composed of two stages: (a) a pre-cleaning intra-frame spectral amplitude estimation stage where an initial estimate of the magnitude frequency response of the LP model of clean speech is obtained and (b) an inter-frame signal processing stage where formant classification and Kalman filters are combined to estimate the trajectory of formants. The effects of car and train noise on the observations and estimation of formants tracks are investigated. The average formant tracking errors at different signal to noise ratios (SNRs) are computed. The evaluation results demonstrate that after noise reduction and Kalman filtering the formant tracking errors are significantly reduced.
Original languageEnglish
Pages2081-2084
Number of pages4
Publication statusPublished - Sep 2005
Event9th European Conference on Speech Communication and Technology (Interspeech'05) - Lisbon, Portugal
Duration: 4 Sep 20058 Sep 2005

Conference

Conference9th European Conference on Speech Communication and Technology (Interspeech'05)
CountryPortugal
CityLisbon
Period4/09/058/09/05

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