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Université de Neuchâtel

Interactions between environmental change and shallow water carbonate buildup along the northern Tethyan margin and their impact on the Early Cretaceous carbon isotope record

Föllmi, Karl B. ; Godet, Alexis ; Bodin, Stéphane ; Linder, Pascal

In: Paleoceanography, 2006, vol. 21, no. PA4211, p. 1-16

The evolution of the Early Cretaceous, northern Tethyan carbonate platform was not only influenced by changes in sea level, detrital influx, and surface water temperature but also by changes in trophic levels. We distinguish between phases of carbonate production dominated by oligotrophic photozoan communities and by mesotrophic and eventually colder-water heterozoan communities. Superimposed on...

Université de Neuchâtel

Speaker recognition on compressed speech

Grassi, Sara ; Dufaux, Alain ; Besacier, Laurent ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the International COST 254 Workshop on Friendly Exchanging through the Net, 2000, vol. 254, p. 117-122

We have investigated the influence of GSM speechcoding in the performance of a text-independent speakerrecognition system based on Gaussian Mixture Models(GMM) classifiers.The performance degradation due to the utilization ofthe three GSM speech coders was first assessed, usingthree transcoded databases, obtained by passing theTIMIT through each GSM coder / decoder. The codeddatabases were used...

Université de Neuchâtel

Implementation of Automatic Speech Recognition for Low-Power Miniaturized Devices

Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto ; Farine, Pierre-André

In: Proceedings of the 5th COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2003, vol. 276, no. 5, p. 59-64

This paper describes the development and implementation of a discrete speech recognizer for application in miniaturized, portable low-power devices. The recognizer is based on Hidden Markov Models (HMMs) and uses Linear Predictive Coefficients (LPC) converted to cepstrum to parameterize the input speech. The implemented recognizer has a complexity of 0.67 MIPS and a recognition performance of...

Université de Neuchâtel

Low Complexity Image Matching in the Compressed Domain by using the DCT-phase

Bracamonte, Javier ; Ansorge, Michael ; Pellandini, Fausto ; Farine, Pierre-André

In: Proceedings of the 6th COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2004, vol. 267, no. 6, p. 88-93

This paper presents a new, simple, and efficient algorithm for image matching in the compressed domain. The proposed technique operates directly on transformed frequency-domain data, which makes it a good choice when dealing with standard-compliant Discrete Cosine Transform (DCT)-based compressed images since it avoids the large computational overhead associated with the decoding stage....

Université de Neuchâtel

Distributed speaker recognition using the ETSI Aurora standard

Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto ; Farine, Pierre-André

In: Proceedings of the 3rd COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2002, vol. 276, no. 3, p. 120-125

The ETSI “Aurora” is a standard for distributed speech recognition over the mobile cellular network. We have investigated the use of the features defined in this standard for speaker recognition, in a text-independent system based on Gaussian Mixture Models (GMM). The application context is distributed speaker recognition for user authentication on the mobile cellular network....

Université de Neuchâtel

Deformation of igneous dikes in and around the Tichka granite, high Atlas — Morocco

Schaer, Jean-Paul

In: Lecture Notes in Earth Sciences (The Atlas System of Morocco : Studies on its Geodynamic Evolution), 1998, vol. 15, p. 129-138

Université de Neuchâtel

Spectral Quantization for Wideband Speech Coding

Biundo, Giuseppina ; Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto

In: Proceedings of the 1st COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2001, vol. 276, no. 1, p. 1-6

In this paper we describe the design of a spec-tral quantization scheme for wideband speech coding. The theoretical basis is given, together with experimental design, and implementation in a proprietary CELP (Code Excited Linear Prediction) coder.

Université de Neuchâtel

Design Techniques for Spectral Quantization in Wideband Speech Coding

Biundo, Giuseppina ; Grassi, Sara ; Ansorge, Michael ; Pellandini, Fausto ; Farine, Pierre-André

In: Proceedings of the 3rd COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2002, vol. 276, no. 3, p. 114-119

In this paper we describe the design of spectral quantization for wideband speech coding in order to achieve low bit-rate, low-complexity, transparent quantization schemes. The theoretical bases are given as well as the experimental design, listening tests and the implementation in a proprietary CELP (Code Excited Linear Prediction) coder.

Université de Neuchâtel

A home for the World's elite : la construction des espaces transnationaux à Beijing

Ferrari, Beatrice ; Söderström, Ola (Dir.)

Mémoire de diplôme universitaire : Université de Neuchâtel, 2006.

Beijing affiche clairement son objectif de devenir une ville globale, tout en réaffirmant sa position prédominante de capitale politique et culturelle du pays. Depuis plusieurs années, on assiste à un véritable processus de modernisation et d’internationalisation de la ville, accompagné de nombreux efforts pour modifier son image. Ce processus est particulièrement visible dans...

Université de Neuchâtel

A low Complexity Change Detection Algorithm Operating in the Compressed Domain

Bracamonte, Javier ; Ansorge, Michael ; Pellandini, Fausto ; Farine, Pierre-André

In: Proceedings of the 8th COST 276 Workshop on Information and Knowledge Management for Integrated Media Communication, 2005, vol. 276, no. 8, p. 7-12

This paper introduces a simple, fast, and efficient algorithm for image change detection in the compressed domain. The proposed technique operates directly on Discrete Cosine Transformed (DCT-ed) data which makes it suitable for processing compressed bit streams produced with DCT-based encoders such as Motion JPEG, MPEG-x, and H.26x. Its limited hardware requirements render this method compatible...