Person

Hynek Hermansky

This person is no longer with EPFL

Related publications (114)

Frequency Domain Linear Prediction for QMF Sub-bands and Applications to Audio Coding

Petr Motlicek, Hynek Hermansky, Sriram Ganapathy

This paper proposes an analysis technique for wide-band audio applications based on the predictability of the temporal evolution of Quadrature Mirror Filter (QMF) sub-band signals. The input audio signal is first decomposed into 64 sub-band signals using Q ...

2007

Non-uniform QMF Decomposition for Wide-band Audio Coding based on Frequency Domain Linear Prediction

Petr Motlicek, Hynek Hermansky, Sriram Ganapathy

This paper presents a new technique for perfect reconstruction non-uniform QMF decomposition developed to increase efficiency of a generic wide-band audio coding system based on Frequency Domain Linear Prediction (FDLP). The base line FDLP codec, operating ...

IDIAP2007

Combination of Acoustic Classifiers based on Dempster-Shafer Theory of evidence

Hynek Hermansky, Fabio Valente

In this paper we investigate combination of neural net based classifiers using Dempster-Shafer Theory of Evidence. Under some assumptions, combination rule resembles a product of errors rule observed in human speech perception. Different combination are te ...

2007

Multi-stream Features Combination based on Dempster-Shafer Rule for LVCSR System

Hynek Hermansky, Fabio Valente

This paper investigates the combination of two streams of acoustic features. Extending our previous work on small vocabulary task, we show that combination based on Dempster-Shafer rule outperforms several classical rules like sum, product and inverse entr ...

2007

Hierarchical Neural Networks Feature Extraction for LVCSR system

Hynek Hermansky, Fabio Valente

This paper investigates the use of a hierarchy of Neural Networks for performing data driven feature extraction. Two different hierarchical structures based on long and short temporal context are considered. Features are tested on two different LVCSR syste ...

2007

Scalable Wide-band Audio Codec based on Frequency Domain Linear Prediction

Petr Motlicek, Hynek Hermansky, Sriram Ganapathy

This paper proposes a technique for wide-band audio applications based on the predictability of the temporal evolution of Quadrature Mirror Filter (QMF) sub-band signals. An input audio signal is first decomposed into 64 frequency sub-band signals using QM ...

IDIAP2007

Multi-stream Features Combination based on Dempster-Shafer Rule for LVCSR System

Hynek Hermansky, Fabio Valente

IDIAP2007

Hierarchical Neural Networks Feature Extraction for LVCSR system

Hynek Hermansky, Fabio Valente

IDIAP2007

Identifying unexpected words using in-context and out-of-context phoneme posteriors

Hynek Hermansky, Hamed Ketabdar

The paper proposes and discusses a machine approach for identification of unexpected (zero or low probability) words. The approach is based on use of two parallel recognition channels, one channel employing sensory information from the speech signal togeth ...

IDIAP2006

Speech Coding based on Spectral Dynamics

Petr Motlicek, Hynek Hermansky

In this paper we present first experimental results with a novel audio coding technique based on approximating Hilbert envelopes of relatively long segments of audio signal in critical-band-sized sub-bands by autoregressive model. We exploit the generalize ...

2006

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