CSLU: S4X Release 1.2

Item Name: CSLU: S4X Release 1.2
Authors: R. A. Cole, M. Noel, T. Lander, T. Durham
LDC Catalog No.: LDC2009S03
ISBN: 1-58563-523-5
Release Date: Sep 15, 2009
Data Type: speech
Sample Rate: 8000 Hz
Sampling Format: 8 bit ulaw
Data Source(s): telephone speech
Application(s): speech recognition
Language(s): English
Language ID(s): eng
Distribution: 1 CD
Member fee: $0 for 2009 members
Non-member Fee: US $150.00
Reduced-License Fee: US $150.00
Extra-Copy Fee: US $150.00
Non-member License: yes
Member License: yes
Online documentation: yes
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: R. A. Cole, et al.
CSLU: S4X Release 1.2
Linguistic Data Consortium, Philadelphia


CSLU: S4X Release 1.2, Linguistic Data Consortium (LDC) catalog number LDC2009S03 and isbn 1-58563-523-5, was created by the Center for Spoken Language Understanding, Oregon Health and Science University (CSLU). The corpus consists of 36 speakers (22 male, 14 female) uttering 11 specified words.

The speakers repeated the following words six times on each of four channels: startrek, supernova, tektronix, generation, nebula, processing, singularity, 71523, abracadabra, sungeeta and computer. The four channels used were office phone, home phone, carbon microphone telephone and speaker phone. Each speech file has a corresponding time-aligned phoneme-level transcription (achieved using automatic forced alignment) and an automatically-generated world-level transcription.

Humans reviewed each utterance in two passes and classified it as good, bad, noisy or different. The results of this verification process are included in the /docs directory.


The data was recorded with the CSLU T1 digital data collection system. Each utterance is recorded as a separate file. These files were sampled at 8 khz 8-bit and stored as ulaw files. All of the data use the RIFF standard file format. This file format is 16-bit linearly encoded.


For an example of the data in this corpus, please listen to this recording of a subject speaking the word 'computer': SD-1030-computer-t3-67.

Content Copyright

Portions 1996, 1998, 2000, 2002 Center for Spoken Language Understanding, Oregon Health and Science University, 2009 Trustees of the University of Pennsylvania