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APPLICATIONS OF SIGNAL ANALYSIS USING AUTOREGRESSIVE MODELS FOR AMPLITUDE MODULATION

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Stochastic techniques in deriving perceptual knowledge

Hynek Hermansky

The paper argues on examples of selected past works that stochastic and knowledge-based approaches do not contradict each other. Frequency resolution of human hearing is decreasing with increasing frequency. Spectral basis designed for optimal discriminati ...

IDIAP2004

LP-TRAP: Linear predictive temporal patterns

Hynek Hermansky

Autoregressive modeling is applied for approximating the temporal evolution of spectral density in critical-band-sized sub-bands of a segment of speech signal. The generalized autocorrelation linear predictive technique allows for a compromise between fitt ...

IDIAP2004

LP-TRAP: Linear predictive temporal patterns

Hynek Hermansky

2004

A New Single-Phase Multilevel Modulator - A Fast and Accurate Method to Compute the Modulator Harmonic Spectra

Alfred Rufer

In the first part, a fast and accurate method to compute the harmonic spectra of PWM modulators is presented. This method allows to compute all measurements based on the harmonics values such as the THD or FWTHD. It is especially advantageous for multileve ...

2004

On the contribution of local current density to neoclassical tearing mode stabilization

Olivier Sauter

Neoclassical tearing modes are driven by the reduction of bootstrap current inside the island due to the flattening of the pressure profile. This current perturbation enhances the magnetic perturbation responsible for the island formation. Therefore it is ...

2004

On the baseband compensation of IQ imbalances in OFDM systems

Ali H. Sayed

OFDM is a widely recognized and standardized modulation scheme for future high bit rate communications. Implementation of OFDM-based systems suffers from inphase-quadrature phase (IQ) imbalances in the front-end analog processing. The IQ imbalances can sev ...

2004

Mel-Cepstrum Modulation Spectrum (MCMS) Features for Robust ASR

Hervé Bourlard, Hemant Misra, Vivek Tyagi

In this paper, we present new dynamic features derived from the modulation spectrum of the cepstral traje ctories of the speech signal. Cepstral trajectories are projected over the basis of sines and cosines yie lding the cepstral modulation frequency resp ...

IDIAP2003

Mel-Cepstrum Modulation Spectrum (MCMS) Features for Robust ASR

Hervé Bourlard, Hemant Misra, Vivek Tyagi

2003

The modulated structure of Ba0.39Sr0.61Nb2O6. I. Harmonic solution

Gervais Chapuis, Alla Arakcheeva

The structure of a crystal of Sr0.61Ba0.39Nb2O6 has been solved and refined as an incommensurate structure in five-dimensional superspace. The structure is tetragonal, superspace group P4bm(pp1/2; p-p1/2), unit-cell parameters a = 12.4566 (9), c = 7.8698 ( ...

2003

Some Emerging Concepts in Speech Recognition.

Hervé Bourlard, Hynek Hermansky

The paper presents a work-in-progress on several emerging concepts in Automatic Speech Recognition (ASR), that are being currently studied at IDIAP. This work can be roughly categorized into three categories: 1) data-guided features, 2) features based on m ...

IDIAP2003