• Publications
  • Influence
Pole zero estimation from speech signals by an iterative procedure
  • K. Schnell, A. Lacroix
  • Mathematics, Computer Science
    IEEE International Conference on Acoustics…
  • 7 May 2001
TLDR
It can be shown that the power spectrum of analyzed speech periods can be better modelled by poles and zeros especially with respect to the gaps in the spectrum.
Generation of nasalized speech sounds based on branched tube models obtained from separate mouth and nose outputs
TLDR
A new approach is discussed for the analysis and generation of nasalized speech sounds considering separate mouth and nose outputs and the enlarged model consists of a superposition of two branched tube models representing the mouth and Nose signals which are excited by residual signals.
Time-varying linear prediction for speech analysis and synthesis
TLDR
A time-varying linear prediction is proposed for speech analysis and synthesis and achieves smooth trajectories of the vocal-tract resonances together with a high time resolution, which is interesting for a variety of application.
Analysis of lossy vocal tract models for speech production
TLDR
For the analysis of speech sounds the parameters of a lossy vocal tract model are estimated from speech signals by an optimization algorithm and the spectrum of the analyzed speech can be approximated well by the estimated magnitude response of the lossyVoice tract model.
Pitch Modification of Speech Residual Based on Parameterized Glottal Flow with Consideration of Approximation Error
  • K. Schnell
  • Mathematics, Computer Science
    IEEE International Conference on Acoustics Speech…
  • 14 May 2006
TLDR
A hybrid approach is proposed based on a partly parameterized model of the glottal flow plus the consideration of the error of the model approximation; both of them are obtained from the residual of speech.
Estimation of Glottal Closure Instances from Speech Signals by Weighted Nonlinear Prediction
TLDR
A method based on nonlinear prediction of speech signals is proposed for detecting the locations of the instances of glottal closures (GCI) using a sliding window technique and a speech database with corresponding EGG signals is analyzed providing GCIs as reference.
Speech production based on lossy tube models: unit concatenation and sound transitions
TLDR
The investigations show that the lossy tube model is advantageous compared to the lossless standard tube model for speech analysis and speech production.
Parameter estimation of branched tube models by iterative inverse filtering
  • K. Schnell, A. Lacroix
  • Computer Science, Mathematics
    14th International Conference on Digital Signal…
  • 1 July 2002
TLDR
An algorithm is proposed for the estimation of the parameters of a branched tube system, which is realized by a lattice structure in discrete time, delivering almost perfect results in the field of speech production for nasals and nasalized vowels.
Inverse filtering of tube models with frequency dependent tube terminations
TLDR
A procedure is proposed to estimate the parameters of these tube models in an adequate way based on inverse filtering, which is carried out iteratively and shows almost perfect results.
Time-varying pre-emphasis and inverse filtering of speech
TLDR
A time-varying linear prediction method applied to speech processing that considers the continuous time evolution of the vocal tract and avoids block-wise processing and the results show that the method is suitable for time- varying inverse filtering.
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