CORPORA from CSLU: Multilanguage telephone speech v1.2

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The Multi-language Telephone Speech Corpus consists of telephone speech from 11 languages: English, Farsi, French, German, Hindi, Japanese, Korean, Mandarin, Spanish, Tamil, Vietnamese. The corpus contains fixed vocabulary utterances (e.g. days of the week) as well as fluent continuous speech. The current release includes recorded utterances from about 2052 speakers, for a total of about 38.5 hours of speech.


Recording conditions:
Each subject called the CSLU data collection system by dialing a toll-free number. An analog telephone line was connected to a Gradient Technologies box. Data from incoming calls were recorded by the Gradient box. The sampling rate was 8khz and the files were stored in 16bit linear format on a UNIX file system. Each utterance was recorded as a separate file.

This corpus was collected and developed in 1992.

Subject Population:
Most subjects were respondents to postings on USEnet newsgroups. Subjects were asked to contribute their voice to science to help with the research.

As per the protocol (see below), each caller was asked to speak for one minute about any topic. In six of the languages some of these files, referred to as "stories", were selected for hand generated fine-phonetic transcriptions. The languages were: English(208), German(101), Hindi(68), Japanese(64), Mandarin(70), Spanish(108). The numbers in parentheses indicate the number of "stories" transcribed for that language.

Y. K. Muthusamy, Ph.D. Thesis, "A Segmental Approach to Automatic Language Identification," OGI Technical
Report No. CSLU 93-002, Nov. 24, 1993.

"The OGI Multi-language Telephone Speech Corpus" Y. K. Muthusamy, R. A. Cole and B. T. Oshika
Proceedings of the International Conference on Spoken Language Processing, Banff, Alberta, Canada, October 1992.

To place your order:
1. Click on the type of license you wish to order. The Academic or non-profit entity fee is $50; Commercial entity fee is $3,000.
2. Terms of the license agreement can be viewed by clicking on the word "terms".
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6. Once your payment has been received and verified by OHSU, your order will be approved by Technology Transfer & Business Development and then the DVD will be sent out by the Center for Spoken Language Understanding by FedEx within 5-10 business days.  


For more information and demos, visit the CSLU Corpora website at:

Files will be made available by download from which requires customers to set up a free account.

Patent Information:
Speech & Language
For Information, Contact:
Arvin Paranjpe
Technology Development Manager
Oregon Health & Science University
(503) 494-8200
Education & Training
Education & Training - Speech & Language
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