Conference paper

NG Tim, HSIAO Roger, ZHANG Le, KARAKOS Damianos, MALLIDI Sri Harish, KARAFIÁT Martin, VESELÝ Karel, SZŐKE Igor, ZHANG Bing, NGUYEN Long and SCHWARTZ Richard. Progress in the BBN Keyword Search System for the DARPA RATS Program. In: Proceedings of Interspeech 2014. Singapore: International Speech Communication Association, 2014, pp. 959-963. ISBN 978-1-63439-435-2. Available from:
Publication language:english
Original title:Progress in the BBN Keyword Search System for the DARPA RATS Program
Title (cs):Pokrok v BBN systému vyhledávání klíčových slov pro DARPA RATS program
Proceedings:Proceedings of Interspeech 2014
Conference:Interspeech 2014
Place:Singapore, SG
Publisher:International Speech Communication Association
speech recognition, KWS, MLP, DNN
This article is about the progress in the BBN Keyword Search System for the DARPA RATS Program (Robust Automatic Transcription of Speech).
This paper presents a set of techniques that we used to improve our keyword search system for the third phase of the DARPA RATS (Robust Automatic Transcription of Speech) program, which seeks to advance state of the art detection capabilities on audio from highly degraded radio communication channels. The results for both Levantine and Farsi, which are the two target languages for the keyword search (KWS) task, are reported. About 13% absolute reduction in word error rate (from 70.2% to 57.6%) is achieved by using acoustic features derived from stacked Multi-Layer Perceptrons (MLP) and Deep Neural Network (DNN) acoustic models. In addition to score normalization and score/system combination for keyword search, we showed that the false alarm rate at the target false reject rate (15%) was reduced by about 1% (from 5.39% to 4.45%) by reducing the deletion errors of the speech-to-text system.
   author = {Tim Ng and Roger Hsiao and Le Zhang and Damianos
	Karakos and Harish Sri Mallidi and Martin
	Karafi{\'{a}}t and Karel Vesel{\'{y}} and Igor
	Sz{\H{o}}ke and Bing Zhang and Long Nguyen and
	Richard Schwartz},
   title = {Progress in the BBN Keyword Search System for the
	DARPA RATS Program},
   pages = {959--963},
   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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