A comparison of ultra-wideband (UWB) communication characteristics for two different shapes of stairs with concrete and iron materials are investigated. The impulse responses of these stairs are computed by shooting and bouncing ray/image (SBR/Image) techniques and inverse Fourier transform. Numerical results show that the bit error rate (BER) of binary-pulse amplitude modulation (B-PAM) system...

In a previous study, we proposed an alternative masking criterion for binary mask estimation based on the underlying linguistic information. We estimated this mask by selecting from a set of candidate masks at each frame based on the hypotheses from an ASR system. Our previous system provided an 8% reduction in WER. In this work, we present an improved method for selecting the correct candidate...

This paper presents the advantages of augmenting a word-based system with sub-word units as a step towards building open vocabulary speech recognition systems. We show that a hybrid system which combines words and data-driven, variable length sub word units has a better phone accuracy than word only systems. In addition the hybrid system is better in detecting Out-Of-Vocabulary (OOV) terms and ...

This paper describes a novel modification of Histogram Equalization (HEQ) approach to robust speech recognition. We propose separate equalization of the high frequency (HF) and low frequency (LF) bands. We study different combinations of the sub-band equalization and obtain best results when we perform a two-stage equalization. First, conventional HEQ is performed on the cepstral features, whic...

In this paper, we describe a method for automatically generating a domain-dependent pronunciation lexicon using a data-driven approach. We also introduce an adaptation method to alleviate some of the errors caused by the data-driven rules which are derived from a relatively small volume of speech corpus. At first, pronunciation variation rules are extracted from a large volume of speech corpus ...

Die Steuerung von und Entscheidungen zum Einsatz von Informationsund Kommunikationstechnologien (IuK) sind für Hochschulen zu einer zentralen Aufgabe geworden. Die gesamte Institution umfassende Projekte, Kooperationen zwischen Hochschulen und der stetig wachsende Finanzdruck führten seit mehr als zehn Jahren zu Empfehlungen verschiedener Institutionen: Die Einführung von für Hochschulen geeign...

The paper provides an analysis of BUT automatic speech recognition systems (ASR) built for the 2016 IARPA Babel evaluation. The IARPA Babel program concentrates on building ASR system for many low resource languages, where only a limited amount of transcribed speech is available for each language. In such scenario, we found essential to train the ASR systems in a multilingual fashion. In this w...

The performance of ASR systems in a room environment with distant microphones is strongly affected by reverberation. As the degree of signal distortion varies among acoustic channels (i.e. microphones), the recognition accuracy can benefit from a proper channel selection. In this paper, we experimentally show that there exists a large margin for WER reduction by channel selection, and discuss s...

This paper presents the corpus developed by the LIUM for Automatic Speech Recognition (ASR), based on the TED Talks. This corpus was built during the IWSLT 2011 Evaluation Campaign, and is composed of 118 hours of speech with its accompanying automatically aligned transcripts. We describe the content of the corpus, how the data was collected and processed, how it will be publicly available and ...

Der Arbeitskreis Barrierefreiheit stellt sich vor. Wer sind wir und was tun wir in der UPA? Welche Gemeinsamkeiten und Berührungspunkte haben Accessibi-