Conference paper

GRÉZL František and FOUSEK Petr. Optimizing bottle-neck features for LVCSR. In: 2008 IEEE International Conference on Acoustics, Speech, and Signal Processing. Las Vegas, Nevada: IEEE Signal Processing Society, 2008, pp. 4729-4732. ISBN 1-4244-1484-9.
Publication language:english
Original title:Optimizing bottle-neck features for LVCSR
Title (cs):Optimalizace Bottle-neck parametrů pro LVCSR
Pages:4729-4732
Proceedings:2008 IEEE International Conference on Acoustics, Speech, and Signal Processing
Conference:33rd International Conference on Acoustics, Speech, and Signal Processing (ICASSP)
Place:Las Vegas, Nevada, US
Year:2008
ISBN:1-4244-1484-9
Publisher:IEEE Signal Processing Society
URL:http://www.fit.vutbr.cz/research/groups/speech/publi/2008/grezl_BN_optim_icassp_2008.pdf [PDF]
Keywords
Bottle-neck, MLP structure, features, LVCSR
Annotation
This publication deals with optimising various processing steps in Bottle-Neck feature extraction for lower word error rate on large vocabulary continuous speech recognition tasks.
Abstract
This work continues in development of the recently proposed. Bottle-Neck features for ASR. A five-layers MLP used in bottle-neck  feature extraction allows to obtain arbitrary feature size without dimensionality reduction by transforms, independently on the MLP training targets. The MLP topology -- number and sizes of layers, suitable training targets, the impact of output feature transforms, the need of delta features, and the dimensionality of the final feature vector are studied with respect to the best ASR result. Optimized features are employed in three LVCSR tasks: Arabic broadcast news, English conversational telephone speech and English meetings. Improvements over standard cepstral features and probabilistic MLP features are shown for different tasks and different neural net input representations. A significant improvement is observed when phoneme MLP training targets are replaced by phoneme states and when delta features are added.
BibTeX:
@INPROCEEDINGS{
   author = {Franti{\v{s}}ek Gr{\'{e}}zl and Petr Fousek},
   title = {Optimizing bottle-neck features for LVCSR},
   pages = {4729--4732},
   booktitle = {2008 IEEE International Conference on Acoustics, Speech, and
	Signal Processing},
   year = {2008},
   location = {Las Vegas, Nevada, US},
   publisher = {IEEE Signal Processing Society},
   ISBN = {1-4244-1484-9},
   language = {english},
   url = {http://www.fit.vutbr.cz/research/view_pub.php?id=8601}
}

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