ARL Urdu Speech Database, Training Data

Item Name: ARL Urdu Speech Database, Training Data
Author(s): Appen Pty Ltd
LDC Catalog No.: LDC2007S03
ISBN: 1-58563-412-3
ISLRN: 513-040-223-174-0
Release Date: February 20, 2007
Member Year(s): 2007
DCMI Type(s): Sound
Sample Type: pcm
Sample Rate: 22050
Data Source(s): microphone speech
Language(s): Urdu
Language ID(s): urd
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2007S03 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Appen Pty Ltd. ARL Urdu Speech Database, Training Data LDC2007S03. Web Download. Philadelphia: Linguistic Data Consortium, 2007.
Related Works: View


ARL Urdu Speech Database, Training Data is a collection of recorded speech from 200 adult native Urdu speakers from Pakistan and Northern India. The recordings in this release were collected by Appen Pty Ltd, Sydney, Australia in 2006. The U.S. Army Research Laboratory (ARL) provided this corpus to the Linguistic Data Consortium for distribution.

Urdu is an Indo-Aryan language spoken throughout South Asia that developed under the Mughal Empire and Delhi Sultinate between 1200 AD and 1800 AD. It has Persian, Turkish and Arabic influences, but in fact is a dialect of Hindustani. The word "Urdu" refers to the standardized register of Hindustani, but there are many non-standard idiolects as well. Urdu is the twentieth most spoken language in the world. It is the native language of over 60 million people, it is the offical language of Pakistan, and it is one of India's national languages. Urdu is also spoken in Afghanistan.

The distribution of speaker dialects in the corpus is as follows:

Accent Number of Speakers
South Sindh 29
North Sindh 30
South Punjab 27
North Punjab 29
Captial Area 29
North West Regions 30
Baluchistan 26


The database is divided into two parts, a training set containing approximately 80% of the data and a test set comprised of 20% of the data. This release consists of approximately 80% of the complete dataset (training and test).


Each speaker was presented with 400 prompts to read: sentences, place names, and person names. Two microphones set at different distances to the speaker were used for the recordings. The recorded speech was stored in raw format files with headers stored in separate directories.

Each utterance was transcribed in the corresponding label file for each recording. The transcriptions were encoded in UTF-8. Punctuation was omitted and numbers were written out in full.


Earlier versions were missing the content list file. This is now available as part of the complete download file.

09/14/18 - The test data for this corpus was originally held back and is now available as part of the download. New downloads after the indicated date will contain the full corpus.


For an example of the data in this corpus, please listen to this following audio sample (.wav format)

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