Conference paper

KARAFIÁT Martin, GRÉZL František, VESELÝ Karel, HANNEMANN Mirko, SZŐKE Igor and ČERNOCKÝ Jan. BUT 2014 Babel System: Analysis of adaptation in NN based systems. In: Proceedings of Interspeech 2014. Singapore: International Speech Communication Association, 2014, pp. 3002-3006. ISBN 978-1-63439-435-2. Available from:
Publication language:english
Original title:BUT 2014 Babel System: Analysis of adaptation in NN based systems
Title (cs):BUT 2014 Babel systém: Analýza adaptace v systémech založených na neuronových sítích
Proceedings:Proceedings of Interspeech 2014
Conference:Interspeech 2014
Place:Singapore, SG
Publisher:International Speech Communication Association
speech recognition, discriminative training,
bottle-neck neural networks, deep neural networks, adaptation
of neural networks, fundamental frequency
The article is about the BUT 2014 Babel System. It describes the analysis of adaptation in neural networks based systems.
Features based on a hierarchy of neural networks with compressive layers - Stacked Bottle-Neck (SBN) features - were recently shown to provide excellent performance in LVCSR systems. This paper summarizes several techniques investigated in our work towards Babel 2014 evaluations: (1) using several versions of fundamental frequency (F0) estimates, (2) semi-supervised training on un-transcribed data and mainly (3) adapting the NN structure at different levels. They are tested on three 2014 Babel languages with full GMM- and DNN-based systems. Separately and in combination, they are shown to outperform the baselines and confirm the usefulness of bottle-neck features in current ASR systems.
   author = {Martin Karafi{\'{a}}t and Franti{\v{s}}ek Gr{\'{e}}zl and
	Karel Vesel{\'{y}} and Mirko Hannemann and Igor Sz{\H{o}}ke
	and Jan {\v{C}}ernock{\'{y}}},
   title = {BUT 2014 Babel System: Analysis of adaptation in NN based
   pages = {3002--3006},
   booktitle = {Proceedings of Interspeech 2014},
   year = {2014},
   location = {Singapore, SG},
   publisher = {International Speech Communication Association},
   ISBN = {978-1-63439-435-2},
   language = {english},
   url = {}

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