Concept

Einstein coefficients

Related publications (42)

User-Customized Password HMM Based Speaker Verification

is presented. The system has no {\it a priori} knowledge of passwords. A hybrid HMM/ANN system is used to infer the phonetic transcription of the password. The emission probabilities are then modeled by a multi-Gaussians HMM model. Evaluation experiments, ...

2002

User-Customized Password Speaker Verification based on HMM/ANN and GMM Models

Hervé Bourlard

In this paper, we present a new approach towards user-custom-ized password speaker verification combining the advantages of hybrid HMM/ANN systems, using Artificial Neural Networks (ANN) to estimate emission probabilities of Hidden Markov Models, and Gaus ...

IDIAP2002

User-Customized Password Speaker Verification based on HMM/ANN and GMM Models

Hervé Bourlard

2002

Robust Speech Recognition and Feature Extraction Using HMM2

Hervé Bourlard, Samy Bengio, Katrin Weber, Shajith Ikbal

This paper presents the theoretical basis and preliminary experimental results of a new HMM model, referred to as HMM2, which can be considered as a mixture of HMMs. In this new model, the emission probabilities of the temporal (primary) HMM are estimated ...

IDIAP2001

Génération de deuxième et troisième harmonique avec un laser Nd:YAG en régime pulsé libre

Sébastian Favre

Industrial laser precision machining is predominately based on pulsed Nd:YAG lasers operated at a wavelength of 1.06 µm in a free running pulse regime. The objective of this thesis work has been to investigate second and third harmonic generation for such ...

EPFL2001

Design and characterization of top-emitting microcavity light-emitting diodes

Romuald Houdré, Jean-François Carlin, Marc Ilegems, Ursula Oesterle

High-efficiency top-emitting InGaAs/AlGaAs microcavity light-emitting diodes (MCLEDs) have been optimized and fabricated. The structures were grown using molecular beam epitaxy on GaAs substrates. They consist of a three-period Be-doped distributed Bragg r ...

2000

High efficiency top-emitting microcavity light-emitting diodes

Romuald Houdré, Jean-François Carlin, Marc Ilegems, Ursula Oesterle

Microcavity light emitting diodes (MCLEDs) present several interesting features compared to conventional LEDs such as narrow linewidth, improved directionality and high efficiency. We report here on MCLEDs with a top emitting geometry. The MCLED layers wer ...

SPIE1999

Strain relief via island ramification in submonolayer heteroepitaxy

Klaus Kern, Harald Brune

The mechanisms of strain relief in submonolayer heteroepitaxy of Cu/Ni(100) are studied using variable temperature scanning tunneling microscopy and high resolution low energy electron diffraction. It is demonstrated that pseudomorphic copper islands, as t ...

1998

Etude de l'amplification optique et de sa saturation dans les puits quantiques

We study the optical properties of strongly photo-excited GaAs/AlxGa1-xAs Quantum Wells in the one-dimensional optical amplifier geometry. One part of our work deals with gain measurements using the "variable stripe length method". We are proposing two new ...

EPFL1994

Gain Measurements in Ingaas/Ingaasp Multiquantum-Well Broad-Area Lasers

Franz-Karl Reinhart, Marc-André Dupertuis

The paper describes gain measurements in InGaAs/InGaAsP multiquantum-well lasers at 1.55-mu-m derived from the spontaneous emission under current injection. The gain spectrum in a broad-area laser device is determined from the spontaneous emission spectrum ...

1992

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