Arabic CTS Levantine Fisher Training Data Set 3, Speech

Item Name: Arabic CTS Levantine Fisher Training Data Set 3, Speech
Author(s): Mohamed Maamouri, Hubert Jin
LDC Catalog No.: LDC2005S07
ISBN: 1-58563-325-9
ISLRN: 852-500-494-190-7
Release Date: January 15, 2005
Member Year(s): 2005
DCMI Type(s): Sound
Sample Type: 1-channel ulaw
Sample Rate: 8000
Data Source(s): telephone conversations, telephone speech
Project(s): EARS, GALE
Language(s): North Levantine Arabic, South Levantine Arabic
Language ID(s): apc, ajp
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2005S07 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Maamouri, Mohamed, and Hubert Jin. Arabic CTS Levantine Fisher Training Data Set 3, Speech LDC2005S07. Web Download. Philadelphia: Linguistic Data Consortium, 2005.
Related Works: View


Arabic CTS Levantine Fisher Training Data Set 3, Speech was developed by the Linguistic Data Consortium (LDC) and contains approximately 50 hours of Levantine Arabic speech.

The corresponding human annotated transcripts are contained in Arabic CTS Levantine Fisher Training Data Set 3, Transcripts (LDC2005T03).

The Fisher telephone conversation collection protocol was created at LDC to address a critical need of developers trying to build robust automatic speech recognition (ASR) systems. Previous collection protocols, such as CALLFRIEND and Switchboard-II, and the resulting corpora, have been adapted for ASR research but were in fact developed for language and speaker identification respectively. Although the CALLHOME protocol and corpora were developed to support ASR technology, they feature small numbers of speakers making telephone calls of relatively long duration with narrow vocabulary across the collection. CALLHOME conversations were challengingly natural and intimate. Under the Fisher protocol, a very large number of participants each made a few calls of short duration speaking to other participants, whom they typically did not know, about assigned topics. This maximized inter-speaker variation and vocabulary breadth although it also increased formality.

Previous protocols such as CALLHOME, CALLFRIEND, and Switchboard relied upon participant activity to drive the collection. Fisher was unique in being platform driven rather than participant driven. Participants who wished to initiate a call did so; however, the collection platform initiated the majority of calls. Participants simply answered their phones at the times they specified when registering for the study.

To encourage a broad range of vocabulary, Fisher participants were asked to speak about an assigned topic chosen from a randomly generated list that changed every 24 hours. All participants that day were assigned subjects from that list. Some topics were inherited or refined from previous Switchboard studies while others were developed specifically for the Fisher protocol.


This corpus contains 322 audio files of Arabic telephone conversations in 2-channel SPHERE ulaw format, sampled at 8 kHz.

Here are the other corpora that comprise the totality of Arabic training data:


For an example of the data in this corpus, please listen to this sample (WAV).


None at this time.

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