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"Can you hear me now?"

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Adaptive joint playout buffer and FEC adjustement for Internet Telephony

Jean-Yves Le Boudec, Catherine Boutremans

We develop a joint playout buffer and Forward Error Correction (FEC) adjustment scheme for Internet Telephony that incorporates the impact of end-to-end delay on the perceived audio quality. We show that it provides a better quality than the adjustment sch ...

2002

Evaluation of Formant-Like Features for ASR

Hervé Bourlard, Samy Bengio, Katrin Weber

This paper investigates possibilities to automatically find a low-dimensional, formant-related physical representation of the speech signal, which is suitable for automatic speech recognition (ASR). This aim is motivated by the fact that formants have been ...

IDIAP2002

Evaluation of Formant-Like Features for ASR

Hervé Bourlard, Samy Bengio, Katrin Weber

2002

Increasing Speech Recognition Noise Robustness with HMM2

Hervé Bourlard, Samy Bengio, Katrin Weber

The purpose of this paper is to investigate the behavior of HMM2 models for the recognition of noisy speech. It has previously been shown that HMM2 is able to model dynamically important structural information inherent in the speech signal, often correspon ...

2002

A Pragmatic View of the Application of HMM2 for ASR

Hervé Bourlard, Samy Bengio, Katrin Weber

This report investigates the HMM2 approach recently introduced in the framework of automatic speech recognition. HMM2 can be seen as a mixture of HMMs, where a conventional primary HMM (processing a time series of speech data) is supported on a lower level ...

IDIAP2001

Analytic Assessment of Telephone Transmission Impact on ASR Performance Using a Simulation Model

Hervé Bourlard

This paper addresses the impact of telephone transmission channels on automatic speech recognition (ASR) performance. A real-time simulation model is described and implemented, which allows impairments that are encountered in traditional as well as modern ...

IDIAP2001

Increasing Speech Recognition Noise Robustness with HMM2

Hervé Bourlard, Samy Bengio, Katrin Weber

IDIAP2001

Some applications of a priori knowledge in multi-stream HMM and HMM/ANN based ASR

Multi-band ASR was largely inspired by the extremely high level of redundancy in the spectral signal representation which can be inferred from Fletcher's product-of-errors rule for human speech perception. Indeed, the main aim of the multi-band approach is ...

2000

Audio-Visual Speech Modelling for Continuous Speech Recognition

This paper describes a complete system for audio-visual recognition of continuous speech including robust lip tracking, visual feature extraction, noise-robust acoustic feature extraction, and sensor integration. An appearance based model of the articulato ...

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