Czech Broadcast News Speech

Item Name: Czech Broadcast News Speech
Author(s): Vlasta Radova, Josef Psutka, Ludek Muller, William Byrne, J V. Psutka, Pavel Ircing, Jindrich Matousek
LDC Catalog No.: LDC2004S01
ISBN: 1-58563-280-5
ISLRN: 767-326-222-377-6
Release Date: April 21, 2004
Member Year(s): 2004
DCMI Type(s): Sound
Sample Type: pcm
Sample Rate: 22050
Data Source(s): broadcast news
Application(s): speech recognition
Language(s): Czech
Language ID(s): ces
License(s): LDC User Agreement for Non-Members
Online Documentation: LDC2004S01 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Radova, Vlasta, et al. Czech Broadcast News Speech LDC2004S01. Web Download. Philadelphia: Linguistic Data Consortium, 2004.
Related Works: View


Czech Broadcast News Speech was produced by the University of West Bohemia and the Linguistic Data Consortium (LDC) and contains 50 hours of Czech broadcast news audio.

The audio was recorded between February 1 and April 22, 2000, at the Department of Cybernetics, University of West Bohemia in Pilsen from three Czech radio stations:

  • Český rozhlas Radiožurnál
  • Český rozhlas Praha (now Dvojka)
  • Český rozhlas Vltava

And two TV channels:

  • Ceska Televize (CTV)
  • Prima TV (Prima)

The corresponding transcripts for these speech files are available in Czech Broadcast News Transcripts (LDC2004T01).

The corpus was created to support the development of large vocabulary speaker independent speech recognition systems for Czech.


There are 286 audio files, totaling approximately 50 hours of broadcast news. The news does not contain weather forecasts, sports news, or traffic announcements. The audio files are single-channel, 22.05 kHz, 16 bit linear wave files. The stations, channels, number of files, and number of hours are listed below:


  Source Files Hours
Radio Radiožurnál 138 30.8
Praha 90 7.8
Vltava 14 2
TV CTV 22 5.1
Prima 22 4.2
Totals 286 50

The transcripts were created by native Czech speakers working at the Department of Cybernetics, University of West Bohemia in Pilsen, under the direction of Vlasta Radova. The transcription was done using software provided by LDC (Transcriber 1.4.1). Those parts of the audio recordings that do not contain speech or where the signal was disrupted were not transcribed. As a consequence, the corpus contains about 23 hours of transcribed speech. The transcriptions are provided in both the ISO-8859-2 and Windows-1250 character set.


Please listen to this audio sample.


The completion of this corpus was facilitated by funding provided by the Ministry of Education of the Czech Republic (Grants No. MSM235200004 and LN00A063) and by the National Science Foundation (NSF) project no. IIS-9820687 entitled "1999 Language Engineering Workshop for Students and Professionals: Integrating Research and Education (WS99)" under the agreement no. 8004-48231 between the Johns Hopkins University, Baltimore, Maryland, and the University of West Bohemia in Pilsen, Czech Republic.


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