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Sacha Krstulovic

Related publications (8)

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EPFL lab session 2/2: Introduction to Hidden Markov Models

Sacha Krstulovic

Lab sessions given in relation to Herve Bourlard's Speech Recognition course at EPFL (Ecole Polytechnique Federale de Lausanne), second semester 2001. The full session is available from the web as ftp://ftp.idiap.ch/pub/sacha/labs/Session2.tgz . ...

IDIAP2001

Signal modeling with Non Uniform Topology lattice filters

Sacha Krstulovic

This article presents a new class of constrained and specialized Auto-Regressive (AR) processes. They are derived from lattice filters where some reflection coefficients are forced to zero at a priori locations. Optimizing the filter topology allows to bui ...

2001

EPFL lab session 1/2: Introduction to Gaussian statistics and pattern recognition

Sacha Krstulovic

IDIAP2001

Inverse lattice filtering of speech with adapted non-uniform delays

Sacha Krstulovic

A particular form of constraint is incorporated to Linear Prediction lattice filter models in the form of unequal-length delays. This constraint amounts to reducing the number of intrinsic degrees of freedom defined by the reflection coefficients without m ...

2000

Relating LPC modeling to a factor-based articulatory model

Sacha Krstulovic

This paper proposes a method for recovering the articulatory parameters of a factor-based vocal tract shape model from the speech waveform. This is realized by analytically relating the shape model to a Linear Prediction lattice filter. Results pertaining ...

2000

LPC-based inversion of the DRM articulatory model

Sacha Krstulovic

Articulatory representations are expected to bring better speech recognition results. This requires to estimate the parameters of a speech production model from the speech sound, problem known as acoustico-articulatory inversion. Known methods to solve thi ...

1999

Acoustico-articulatory inversion of unequal-length tube models through lattice inverse filtering

Sacha Krstulovic

Constraints related to the Distinctive Regions and Modes (DRM) speech production model are incorporated in the framework of speech analysis by inverse filtering. It is shown that the analogy between Auto-Regressive modeling and acoustic models based on aco ...

IDIAP1998

Investigation of a possible process identity between DRM and Linear Filtering

Sacha Krstulovic

The classical analogy between linear filtering and acoustical filtering by tubes is applied in the non-classical case where the tubes are made of unequal-length sections (such as the DRM case). It is shown that the filtering process identity is substantial ...

IDIAP1997