Conference paper

KARAKOS Damianos, SCHWARTZ Richard, TSAKALIDIS Stavros, ZHANG Le, RANJAN Shivesh, NG Tim, HSIAO Roger, NGUYEN Long, GRÉZL František, HANNEMANN Mirko, KARAFIÁT Martin, SZŐKE Igor and VESELÝ Karel et al. Score Normalization and System Combination for Improved Keyword Spotting. In: Proceedings of ASRU 2013. Olomouc: IEEE Signal Processing Society, 2013, pp. 210-215. ISBN 978-1-4799-2755-5.
Publication language:english
Original title:Score Normalization and System Combination for Improved Keyword Spotting
Title (cs):Normalizace skóre a kombinace systémů pro vylepšenou detekci klíčových slov
Pages:210-215
Proceedings:Proceedings of ASRU 2013
Conference:IEEE 2013 Workshop on Automatic Speech Recognition and Understanding
Place:Olomouc, CZ
Year:2013
ISBN:978-1-4799-2755-5
Publisher:IEEE Signal Processing Society
URL:http://www.fit.vutbr.cz/research/groups/speech/publi/2013/karakos_asru2013_0000210.pdf [PDF]
Keywords
keyword search, score normalization, system combination, indexing and search
Annotation
This article is about Score Normalization and System Combination for Improved Keyword Spotting (KWS).
Abstract
We present two techniques that are shown to yield improved Key- word Spotting (KWS) performance when using the ATWV/MTWV performance measures: (i) score normalization, where the scores of different keywords become commensurate with each other and they more closely correspond to the probability of being correct than raw posteriors; and (ii) system combination, where the detections of multiple systems are merged together, and their scores are in- terpolated with weights which are optimized using MTWV as the maximization criterion. Both score normalization and system com- bination approaches show that significant gains in ATWV/MTWV can be obtained, sometimes on the order of 8-10 points (absolute), in five different languages. A variant of these methods resulted in the highest performance for the official surprise language evaluation for the IARPA-funded Babel project in April 2013.
BibTeX:
@INPROCEEDINGS{
   author = {Damianos Karakos and Richard Schwartz and Stavros Tsakalidis
	and Le Zhang and Shivesh Ranjan and Tim Ng and Roger Hsiao
	and Long Nguyen and Franti{\v{s}}ek Gr{\'{e}}zl and Mirko
	Hannemann and Martin Karafi{\'{a}}t and Igor Sz{\H{o}}ke and
	Karel Vesel{\'{y}}},
   title = {Score Normalization and System Combination for Improved
	Keyword Spotting},
   pages = {210--215},
   booktitle = {Proceedings of ASRU 2013},
   year = {2013},
   location = {Olomouc, CZ},
   publisher = {IEEE Signal Processing Society},
   ISBN = {978-1-4799-2755-5},
   language = {english},
   url = {http://www.fit.vutbr.cz/research/view_pub.php?id=10506}
}

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