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QUALITY MEASUREMENTS FOR MOBILE DATA COLLECTION IN THE DEVELOPING WORLD 3

QUALITY MEASUREMENTS FOR MOBILE DATA COLLECTION IN THE DEVEL...

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3rd Workshop on Spoken language Technologies for Under-Resourced languages, SLTU 2012

作者： Badenhorst, Jaco de Waal, Alta de Wet, Febe Human Language Technology Competency Area CSIR Meraka Institute South Africa

The collection of speech data suitable for speech technology development is a challenge for under-resourced languages. Factors such as cost, availability of mother-tongue speakers and vast geographic distances call for techniques to optimise the data collection process in order to reduce re-collection of data. The use of mobile devices facilitate remote speech data collection. Although mobile (and remote) data collection addresses the challenging factors mentioned above, the environment is still less controlled than in the case of laboratory or studio-based recordings. In this paper we firstly revisit semi-realtime, basic quality control checks as implemented on available mobile-based speech data collection software (Woefzela). In addition, we introduce a quality control technique that uses speech duration estimation to validate the acoustic quality of the speech samples. We compare both techniques with manual verifications. © SLTU 2012. All Rights Reserved.

关键词： Quality control

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RESOURCE DEVELOPMENT AND EXPERIMENTS IN AUTOMATIC SOUTH AFRICAN BROADCAST NEWS TRANSCRIPTION 3

RESOURCE DEVELOPMENT AND EXPERIMENTS IN AUTOMATIC SOUTH AFRI...

引用

3rd Workshop on Spoken language Technologies for Under-Resourced languages, SLTU 2012

作者： Kamper, Herman de Wet, Febe Hain, Thomas Niesler, Thomas Department of Electrical and Electronic Engineering Stellenbosch University South Africa Human Language Technology Competency Area CSIR Meraka Institute Pretoria South Africa Department of Computer Science University of Sheffield United Kingdom

We present a description of the development and evaluation of a first South African broadcast news transcription system. We describe a number of speech resources which have been collected in the resource-scarce South African environment for system development purposes: a 20 hour corpus of South African English (SAE) broadcast news;a 109M word corpus of South African newspaper text collected for language modelling purposes;and a 60k word SAE pronunciation dictionary. The development of our system is based on similar state-of-the-art broadcast news transcription systems and uses cross-word triphone HMMs, MF-PLP features and per-segment cepstral mean and per-bulletin cepstral variance normalisation. Our final system achieves a word error rate of 24.6%. We find that reasonable performance is achieved on newsreader speech while poor performance is achieved on spontaneous and telephone speech in our test data. Finally, we consider the recognition of MP3-compressed audio and show that performance deteriorates only at low bit-rates. © SLTU 2012. All Rights Reserved.

关键词： Modeling languages

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Readability index as a design criterion for elicited imitation tasks in automatic oral proficiency assessment

Readability index as a design criterion for elicited imitati...

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2011 ISCA International Workshop on Speech and language technology in Education, SLaTE 2011

作者： de Wet, Febe Müller, Pieter van der Walt, Christa Niesler, Thomas Human Language Technology Competency Area CSIR Meraka Institute Pretoria South Africa Department of Electrical and Electronic Engineering Stellenbosch University South Africa Department of Curriculum Studies Stellenbosch University South Africa

We investigate the effectiveness of using an accepted readability index, the Flesch Reading Ease (FRE) scale, to design prompts for an automatic oral proficiency assessment system. The prompts in question are uttered by the system, and must be repeated from memory by the test subjects, in the form of an elicited imitation exercise. The FRE scores for our prompts are shown to correlate well with the repeat accuracy ratings given to the same prompts by human judges. The prompts are also shown to perform well in the automatic assessment of oral proficiency by means of the elicited imitation tasks with more than one group of university students. We therefore conclude that a readability index, such as the FRE, can be used as a design criterion for prompts in an automated elicited imitation test. © SLaTE 2011. All Rights Reserved.

关键词： automatic oral proficiency assessment elicited imitation task Flesch Reading Ease scale readability index

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