1998 HUB5 English Evaluation

Item Name: 1998 HUB5 English Evaluation
Author(s): David Graff, Alvin Martin, David Miller
LDC Catalog No.: LDC2002S10
ISBN: 1-58563-226-0
ISLRN: 320-759-350-893-6
DOI: https://doi.org/10.35111/py2a-6706
Release Date: March 27, 2002
Member Year(s): 2002
DCMI Type(s): Sound
Sample Type: 2-channel ulaw
Sample Rate: 8000
Data Source(s): telephone conversations
Project(s): Hub5-LVCSR, GALE, EARS
Application(s): speech recognition
Language(s): English
Language ID(s): eng
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2002S10 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Graff, David, Alvin Martin, and David Miller. 1998 HUB5 English Evaluation LDC2002S10. Web Download. Philadelphia: Linguistic Data Consortium, 2002.
Related Works: View


1998 HUB5 English Evaluation was developed by the Linguistic Data Consortium (LDC) and consists of English conversational telephone speech used in the 1998 HUB5 evaluation sponsored by NIST (National Institute of Standards and Technology). 

The Hub5 evaluation series focused on conversational speech over the telephone with the particular task of transcribing conversational speech into text. Its goals were to explore promising new areas in the recognition of conversational speech, to develop advanced technology incorporating those ideas and to measure the performance of new technology. Further information about the evaluation can be found on the NIST HUB5 website and in The 1998 HUB-5E Evaluation Plan for Recognition of Conversational Speech over the Telephone in English, included in this release.


The source data consists of conversational telephone speech collected by LDC: (1) 20 telephone conversations from Swtichboard-2 Phase 1 (LDC98S75) in which recruited speakers were connected through a robot operator to carry on casual conversations about a daily topic announced by the robot operator at the start of the call; and (2) 20 telephone conversations from CALLHOME American English Speech which consists of unscripted telephone conversations between native English speakers.

The audio files are two channel interleaved mulaw in sphere format. The sphere headers have been modified from the original evaluation data by the addition of sample checksums to the CALLHOME data files.

Corresponding transcripts are available in 1998 HUB5 English Transcripts (LDC2003T02).


Please listen to this audio sample.


There are no updates at this time.

Available Media

View Fees

Login for the applicable fee