1997 HUB5 Spanish Evaluation

Item Name: 1997 HUB5 Spanish Evaluation
Author(s): Linguistic Data Consortium
LDC Catalog No.: LDC2002S25
ISBN: 1-58563-235-x
ISLRN: 676-014-440-538-8
DOI: https://doi.org/10.35111/ex0y-vh14
Release Date: December 22, 2002
Member Year(s): 2002
DCMI Type(s): Sound
Sample Type: ulaw
Sample Rate: 8000
Data Source(s): telephone conversations
Project(s): Hub5-LVCSR, GALE, EARS
Application(s): speech recognition
Language(s): Spanish
Language ID(s): spa
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2002S25 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Linguistic Data Consortium. 1997 HUB5 Spanish Evaluation LDC2002S25. Web Download. Philadelphia: Linguistic Data Consortium, 2002.
Related Works: View


The 1997 HUB5 Spanish Evaluation was produced by Linguistic Data Consortium (LDC) catalog number LDC2002S25 and ISBN 1-58563-235-x.

The 1997 HUB5 Non-English Evaluation is part of an ongoing series of periodic evaluations conducted by NIST. These evaluations provide an important contribution to the direction of research efforts and the calibration of technical capabilities. They are intended to be of interest to all researchers working on the general problem of conversational speech recognition. To this end the evaluation was designed to be simple, to focus on core speech technology issues, to be fully supported, and to be accessible.

The HUB5 Non-English Evaluation focuses on the task of transcribing conversational speech into text. This task is posed in the context of conversational telephone speech. The evaluation is designed to foster research progress, with the goals of:

  • exploring promising new ideas in the recognition of conversational speech
  • developing advanced technology incorporating these ideas
  • measuring the performance of this technology

The task is to transcribe conversational speech. The speech to be transcribed is presented as a set of conversations collected over the telephone. Each conversation is represented as a "4-wire" recording, that is with two distinct sides, one from each end of the telephone circuit. Each side is recorded and stored as a standard telephone codec signal (8 kHz sampling, 8-bit mu-law encoding).

Additional documentation is available on the NIST website.


This publication contains 20 sphere files encoded in two channel interleaved mulaw with a sampling rate of 8 KHz, for a total of 447,201,280 bytes (426 Mbytes) or seven hours of sphere data.

An included documentation table contains information on the speech segments to be processed as follows:



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