Ales Prazák
University of West Bohemia
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Publication
Featured researches published by Ales Prazák.
international conference on signal processing | 2008
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
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
Ales Prazák; Ludek Müller; Josef Psutka
conference of the international speech communication association | 2012
Ales Prazák; Zdenek Loose; Jan Trmal; Josef Psutka
international conference on signal processing and multimedia applications | 2013
Ales Prazák; Josef Psutka; Zdenek Loose
international conference on signal processing and multimedia applications | 2011
Ales Prazák; Zdenek Loose; Josef Psutka; Vlasta Radová; Ludek Müller
international conference on signal processing and multimedia applications | 2009
Ales Prazák; Zbynek Zajic; Lukáš Machlica; Josef Psutka
international conference on signal processing and multimedia applications | 2007
Josef Psutka; Luboš Šmídl; Ales Prazák
language resources and evaluation | 2018
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
Marek Hrúz; Ales Prazák; Michal Busta