2002 Rich Transcription Broadcast News and Conversational Telephone Speech

Item Name: 2002 Rich Transcription Broadcast News and Conversational Telephone Speech
Author(s): John S. Garofolo, Jonathan G. Fiscus, Audrey Le
LDC Catalog No.: LDC2004S11
ISBN: 1-58563-311-9
ISLRN: 171-813-937-657-8
DOI: https://doi.org/10.35111/h4y1-2g85
Release Date: November 19, 2004
Member Year(s): 2004
DCMI Type(s): Sound, Text
Data Source(s): broadcast news, telephone conversations
Project(s): EARS, GALE
Application(s): automatic content extraction, discourse analysis, information retrieval, language modeling, speaker identification, speaker verification, speech recognition
Language(s): English
Language ID(s): eng
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2004S11 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Garofolo, John S., Jonathan Fiscus, and Audrey Le. 2002 Rich Transcription Broadcast News and Conversational Telephone Speech LDC2004S11. Web Download. Philadelphia: Linguistic Data Consortium, 2004.
Related Works: View


2002 Rich Transcription Broadcast News and Conversational Telephone Speech was produced by the Linguistic Data Consortium (LDC) and contains 10 hours of English broadcast news and conversational telephone speech audio in addition to reference transcripts and annotation data.

This corpus contains the test material used in the 2002 Rich Transcription (RT-02) Evaluation of Broadcast News and Conversational Telephone Speech, administered by the NIST Speech Group in the Spring of 2002. The RT-02 Meeting Recognition Evaluation material is available in a separate distribution. For complete up-to-date information, see the RT-02 Evaluation Website.

The RT-02 Evaluation supported two main evaluation tasks:

  1. Speech-To-Text (STT) Tasks -- included three processing speeds (1x real time, 10x real time, and unlimited time) for both the Broadcast News (BN) and Conversational Telephone Speech (CTS) domains.
  2. Metadata Extraction (MDE) Task -- consisted of a speaker diarization task for the BN and CTS domains.


This distribution of the RT-02 Evaluation Data contains only Broadcast News and Conversational Telephone Speech data. Meeting data used in the RT-02 Evaluation is not included in this distribution and is packaged in a separate distribution. All recordings are in English.

The BN data is composed of six approximately 10-minute excerpts from six different broadcasts. Each waveform is a SPHERE-headered, single-channel, 16-bit PCM file. The broadcasts were selected from programs from MNB, PRI, NBC, CNN, VOA, and ABC, all collected in 1998. Although the entire audio file is provided for and available within broadcast adaptation, only the excerpts listed in the system input UEM files are included in the evaluation. The evaluation excerpts were transcribed to the nearest story boundary.

The CTS data is composed of 60 approximately five-minute excerpts from 60 different conversations: 20 from Switchboard-1 data, 20 from Switchboard-2 data, and 20 from Switchboard Cellular-2 data. Evaluation excerpts were transcribed to the nearest turn. Unlike the BN audio files where the full broadcasts were provided, the CTS audio files contain only the evaluation excerpts. Each audio excerpt is a SPHERE-headered, two channel interleaved 8-bit mulaw file.

The reference transcripts are also provided in this corpus. The official format for STT reference data is STM (files with the extension 'stm'), while the official format for MDE reference data is RTTM (files with the extension 'rttm'). Files with the extensions 'txt' or 'utf' are the original reference transcripts before any format conversions, additions of annotations, etc., and are included for completeness.


Please examine this example to review a sample of this corpus.


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