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Dive into the research topics where Ales Prazák is active.

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Featured researches published by Ales Prazák.


international conference on signal processing | 2008

Efficient combination of n-gram language models and recognition grammars in real-time LVCSR decoder

Ales Prazák; Pavel Ircing; Jan Švec; Josef Psutka

The paper presents a method for incorporation of regular grammars into n-gram language models. Such composite model then benefits from both language modeling formalisms - a grammar yields robust probability estimates for well-defined phrases with fixed structure whereas the n-gram provides better coverage of casual speech. Moreover, the grammar allows adding new words to the phrase pattern while taking advantage of the existing structural (context) information. The proposed method for grammar incorporation allows the use of combined models in our in-house real-time decoder which is designed to work only with standard n-gram language model. The performance of the combined model was tested in the dictation task where a simple grammar was designed for date entries. A statistically significant improvement of WER was achieved.


international conference on signal processing | 2008

Multiple application of the MLLT based on clustering supported by phonetic knowledge

Josef Psutka; Ales Prazák

This paper intends to show the effect of multiple use of a Maximum Likelihood Linear Transform (MLLT) in continuous speech recognition tasks. The corresponding covariance matrices that were subjected to the transform were clustered using phonetic knowledge. The impact of this approach was tested on the ASRs with PLP- and MFCC-based front-ends and was compared with other known feature decorrelation and dimension reduction techniques.


international conference on signal processing and multimedia applications | 2007

LIVE TV SUBTITLING - Fast 2-pass LVCSR System for Online Subtitling

Ales Prazák; Ludek Müller; Josef Psutka


conference of the international speech communication association | 2012

Novel Approach to Live Captioning Through Re-speaking: Tailoring Speech Recognition to Re-speaker's Needs.

Ales Prazák; Zdenek Loose; Jan Trmal; Josef Psutka


international conference on signal processing and multimedia applications | 2013

Towards live subtitling of TV ice-hockey commentary

Ales Prazák; Josef Psutka; Zdenek Loose


international conference on signal processing and multimedia applications | 2011

Four-phase re-speaker training system

Ales Prazák; Zdenek Loose; Josef Psutka; Vlasta Radová; Ludek Müller


international conference on signal processing and multimedia applications | 2009

Fast Speaker Adaptation in Automatic Online Subtitling

Ales Prazák; Zbynek Zajic; Lukáš Machlica; Josef Psutka


international conference on signal processing and multimedia applications | 2007

Searching for a robust MFCC-based parameterization for ASR application

Josef Psutka; Luboš Šmídl; Ales Prazák


language resources and evaluation | 2018

Towards Processing of the Oral History Interviews and Related Printed Documents.

Zbynek Zajic; Lucie Skorkovská; Petr Neduchal; Pavel Ircing; Josef Psutka; Marek Hrúz; Ales Prazák; Daniel Soutner; Jan Švec; Lukáš Bureš; Ludek Müller


conference of the international speech communication association | 2018

Multimodal Name Recognition in Live TV Subtitling.

Marek Hrúz; Ales Prazák; Michal Busta

Collaboration


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Josef Psutka

University of West Bohemia

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Ludek Müller

University of West Bohemia

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Jan Švec

University of West Bohemia

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Zbynek Zajic

University of West Bohemia

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Zdenek Loose

University of West Bohemia

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Daniel Soutner

University of West Bohemia

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Lucie Skorkovská

University of West Bohemia

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Marek Hrúz

University of West Bohemia

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Pavel Ircing

Johns Hopkins University

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Adam Chylek

University of West Bohemia

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