TDT2 English Audio

Item Name: TDT2 English Audio
Author(s): David Graff
LDC Catalog No.: LDC99S84
ISBN: 1-58563-543-X
ISLRN: 350-408-401-790-0
Member Year(s): 1999
DCMI Type(s): Sound
Data Source(s): broadcast news
Project(s): TIDES, TDT, GALE, EARS
Application(s): topic detection and tracking, speech recognition
Language(s): English
Language ID(s): eng
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC99S84 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Graff, David. TDT2 English Audio LDC99S84. DVD. Philadelphia: Linguistic Data Consortium, 1999.


  • 1999 Commercial Members: $0
  • 1999 Non-Profit Members: $1460
  • Non-Members: $14,600


Topic Detection and Tracking (TDT) refers to automatic techniques for finding topically related material in streams of data such as newswire and broadcast news. The TDT2 corpus was created to support three TDT2 tasks: find topically homogeneous sections (segmentation), detect the occurrrence of new events (detection), and track the reoccurrencce of old or new events (tracking).


The TDT2 Audio Corpus contains a total of 1,036 waveform files. Each file is a complete single-channel recording of 30- or 60-minute broadcast, which has been digitized at a sample rate of 16 KHz using 16-bit samples.

The four broadcast sources represented in the corpus with their format and programning frequency are as follows:

ABC World News Tonight  -- "traditional" network news, 30 minutes/day

CNN Headline News -- continuous news summaries, up to 4 30-minute samples/day

PRI The World --  "in-depth" radio news, 60 minutes/weekday

VOA -- varied 60-minute news programs, up to 2/day


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