André Goalic

France Télécom · Signal et Communications

The TRIDENT (TRansmission d'Images et de Données EN Temps réeel) project was launched a few years ago by GESMA (Groupe d'Etudes Sous Marine de l'Atlantique). The initial objectives were to develop a multiple-rate underwater acoustic link for images, text and data transmission. Later, the speech option was added, and more recently channel coding opt...

We propose a novel framework for noise robust automatic speech recognition (ASR) based on cochlear implant-like spectrally reduced speech (SRS). Two experimental protocols (EPs) are proposed in order to clarify the advantage of using SRS for noise robust ASR. These two EPs assess the SRS in both the training and testing environments. Speech enhance...

TRIDENT project was launched a few years ago by GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique) in collaboration with TELECOM Bretagne. First objectives were to develop a multiple rate underwater acoustic link for images, speech signal, text and data transmission. This link was designed to provide a wireless communication to AUVs. Recently the...

In 1997 GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique), in collaboration with TELECOM Bretagne, launched a new project, called TRIDENT. First objectives were to develop a multiple rate underwater acoustic link for images, text and data transmission. This link was designed to provide a wireless communication to AUVs. Since 2006, the platform w...

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This correspondence investigates the recognition of cochlear implant-like spectrally reduced speech (SRS) using mel frequency cepstral coefficient (MFCC) and hidden Markov model (HMM)-based automatic speech recognition (ASR). The SRS was synthesized from subband temporal envelopes extracted from original clean test speech, whereas the acoustic mode...

In collaboration with TELECOM Bretagne, GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique) has recently developed a platform for data transmission via broadband underwater acoustic link. The acoustic link must be robust and have a bit rate high enough to transmit different kinds of information. The platform, called TRIDENT presents interesting pr...

In this paper, we investigate the recognition of cochlear implantlike spectrally reduced speech (SRS) using conventional speech features (MFCCs and PLP coefficients) and HMM-based ASR. The SRS was synthesized from subband temporal envelopes extracted from original clean speech for testing, whereas the acoustic models were trained on a different set...

In this paper, we present a quantitative study on the speech fundamental frequency (F0) of the cochlear implant-like spectrally reduced speech (SRS). The SRS was synthesized from the subband amplitude and frequency modulations (AM and FM) of original clean speech utterances selected from the TI-digits database. The SRS synthesis algorithm was deriv...

Dans cet article, nous proposons une nouvelle méthode pour l'estimation de l'aire d'ouverture de la bouche à partir d'une séquence vidéo du mouvement des lèvres. Dans cette méthode, nous exploiterons les différents degrés de corrélation entre les enveloppes acoustiques et les mouvements visuels, reporté par Grant et Seitz 2000, pour établir un modè...

The TRIDENT project was launched a few years ago by GESMA. The First objectives were to develop a multiple rate underwater acoustic link for images, text and data transmission. This link was designed to provide a wireless communication to AUVs . Recently the platform was extended to low bit rate speech transmission using a MELP [1] coder working at...

GESMA's (Groupe d'Etudes Sous-Marines de l'Atlantique) objective is to develop a sufficiently robust acoustic link allowing the transmission of different information (text, images...). A real-time platform named TRIDENT (TRansmission d'Images et de Donnes EN Temps reel) was designed at TELECOM Bretagne. A blind spatio-temporal equalizer is used to...

GESMA's (Groupe d'Etudes Sous-Marines de l'Atlantique) objective is to develop a sufficiently robust acoustic link allowing the transmission of different data (text, images, etc.). Implementation of the acoustic link has led the ENST Bretagne to develop a real-time platform called TRIDENT (TRansmission d'Images et de Données EN Temps réel). To re...

This letter considers high-rate block turbo codes (BTC) obtained by concatenation of two single-error-correcting Reed-Solomon (RS) constituent codes. Simulation results show that these codes perform within 1 dB of the theoretical limit for binary transmission over additive white Gaussian noise with a low-complexity decoder. A comparison with Bose-C...

GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique), initiated a project named TRIDENT (TRansmission d'Images et de Données EN Temps réel) a few years ago. The project's objective is to develop a high data rate link allowing the transmission of different information (text, images...). A real-time receiver platform based on a spatio- temporal equal...

On the last ten years, GESMA and its main partners, Sercel Brest and ENST Bretagne realized different projects related to underwater acoustic communication. The underwater acoustic channel is so harsh that different strategies have to be considered according to the desired application. From point to point to network and from short to long range, th...

Current needs in underwater acoustic communication, both for civil and military applications, are continuously increasing. During these last years, GESMA (Groupe d'Etudes Sous-Marines de l'Atlantique) and ENST-Bretagne developed the TRIDENT system (TRIDENT : TRansmission de Donne´es EN Temps re´el). This is the first real time acoustic link able to...

High code rate Block Turbo Codes (BTC) using Bose-Chaudhuri-Hocquenghem (BCH) codes have already demonstrated near Shannon performances for Quadrature Phase-Shift Keying (QPSK) over Additive White Gaussian Noise (AWGN) channel. We show here that reliable transmission can be achieved at less than 1 dB from Shannon limit with very low complexity Reed...

The performance of nonbinary BTC with QPSK modulation over AWGN channel is studied. The most widely used nonbinary code is Reed-Solomon (RS) code, which has the maximum distance separable (MDS) property. A single error-correcting RS component code to construct RS product codes is proposed. The so constructed RS product codes can achieve reliable tr...

High code rate block turbo codes (BTC) using Bose-Chaudhuri-Hocquenghem (BCH) codes have already demonstrated near Shannon performances for quadrature phase-shift keying (QPSK) over additive white Gaussian noise (AWGN) channel. We show here that very low complexity Reed-Solomon (RS) BTC can also achieve reliable transmission at less than 1 dB from...

Product codes were introduced in 1954 by Elias and consist of a serial concatenation of two linear block codes with an uniform interleaver. The coding process only uses two linear block codes and creates a matrix in which both columns and rows are codewords. The decoding process can use different algorithms. After first implementing the Chase algor...

To speed up and enhance real time DSP application developments, a new kind of tool called "Code Composer Studio (CCS)" can be used, in the Texas Instrument DSP environment. It allows an easy check of real time "Block Turbo Code (BTC)" behaviour. The studio also includes the new DSP analysis technology, the Real-Time Data Exchange (RTDX). Thus the e...

A new “block turbo code” algorithm was proposed previously for decoding product codes. A high coding rate with a high coding gain can be obtained with this code. Compared to convolutional turbo codes, the performance is comparable. To suit different applications, it is desirable to easily modify the component codes parameters. For obtaining both fl...

The code excited linear prediction coder (CELP) makes it possible to synthesize good quality speech at low bit rates. In such a case, speech quality mainly depends on spectral envelope design accuracy. Different kinds of parameters belonging to the parametrical domain (linear prediction coefficients {a_i}-LPC-parameters), to the time doma...

The paper deals with the design of a digital acoustic underwater phone prototype. Digital techniques allow to achieve a synthesized speech with a quality close to the telephonic one. The input speech signal is compressed down to 5.45 kbit/s using a CELP coder. The bit rate is 6 kbit/s before channel coding and expected to be about 8 kbits/s after c...

La transmission de données numériques par onde acoustique dans le canal sous-marin est soumise à un certain nombre de lois physiques imposant le choix du codeur-décodeur de parole pour la définition d'un téléphone acoustique numérique sous-marin. Le choix d'un système de codage est un compromis entre la portée envisagée et le débit binaire à transm...

We propose a new method for estimation of area of mouth open-ing from a video sequence of the speaking person. In a paper pub-lished in 2000, Grant and Seitz have reported the different degrees of correlation between acoustic envelopes and visible movements. In our method, we exploit these correlations to establish a mathe-matical model of a Single...

Before transmission in a narrow band channel, the speech signal has to be compressed. The Code Excited Linear Prediction Coder (CELP) makes it possible to synthesize good quality speech at low bit rates. Different speech linear predictive coding parameters can be used to design the speech spectral envelope. In our coder the Line Spectrum Pairs (LSP...