IARPA Babel Mongolian Language Pack IARPA-babel401b-v2.0b

Item Name: IARPA Babel Mongolian Language Pack IARPA-babel401b-v2.0b
Author(s): Aric Bills, Judith Bishop, Thomas Conners, Anne David, Eyal Dubinski, Jonathan G. Fiscus, Ketty Gann, Mary Harper, Michael Kazi, Lynn-Li Lim, Nicolas Malyska, Jennifer Melot, Jessica Ray, Anton Rytting, Sinney Shen, Rosanna Smith
LDC Catalog No.: LDC2020S10
ISBN: 1-58563-945-1
ISLRN: 312-159-865-368-5
DOI: https://doi.org/10.35111/hgpe-cp39
Release Date: October 15, 2020
Member Year(s): 2020
DCMI Type(s): Sound, Text
Sample Type: alaw
Sample Rate: 8000
Data Source(s): telephone conversations
Application(s): speech recognition
Language(s): Halh Mongolian
Language ID(s): khk
License(s): IARPA Babel Mongolian Agreement (For-Profit)
IARPA Babel Mongolian Agreement (Non-Member)
IARPA Babel Mongolian Agreement (Not-For-Profit)
Online Documentation: LDC2020S10 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Bills, Aric, et al. IARPA Babel Mongolian Language Pack IARPA-babel401b-v2.0b LDC2020S10. Web Download. Philadelphia: Linguistic Data Consortium, 2020.
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IARPA Babel Mongolian Language Pack IARPA-babel401b-v2.0b was developed by Appen for the IARPA (Intelligence Advanced Research Projects Activity) Babel program. It contains approximately 204 hours of Halh Mongolian conversational and scripted telephone speech collected in 2014 along with corresponding transcripts.

The Babel program focused on underserved languages and sought to develop speech recognition technology that could be rapidly applied to any human language to support keyword search performance over large amounts of recorded speech.


The Halh Mongolian speech in this release represents that spoken by native speakers in Mongolia. The gender distribution among speakers is approximately equal; speakers' ages range from 16 years to 61 years. Calls were made using different telephones (e.g., mobile, landline) from a variety of environments including the street, a home or office, a public place, and inside a vehicle.

Audio data is presented as 8kHz 8-bit a-law encoded audio in sphere format and 48kHz 24-bit PCM encoded audio in wav format.

Transcripts are encoded in UTF-8 in both Mongolian Cyrillic and a romanization scheme developed by Appen; they cover approximately 77% of the speech data. Further information about transcription methodology is contained in the documentation accompanying this release.

Evaluation data is available from NIST in support of OpenKWS.


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