CSLU: National Cellular Telephone Speech Release 2.3

Item Name: CSLU: National Cellular Telephone Speech Release 2.3
Author(s): Ronald Allan Cole, M Noel, T. Lander, T Durham
LDC Catalog No.: LDC2008S02
ISBN: 1-58563-467-0
ISLRN: 571-537-588-741-2
DOI: https://doi.org/10.35111/wj80-ka72
Release Date: March 19, 2008
Member Year(s): 2008
DCMI Type(s): Sound
Sample Type: ulaw
Sample Rate: 8000
Data Source(s): telephone speech
Application(s): speaker identification, speech recognition
Language(s): English
Language ID(s): eng
License(s): CSLU Agreement
Online Documentation: LDC2008S02 Documents
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: Cole, Ronald Allan, et al. CSLU: National Cellular Telephone Speech Release 2.3 LDC2008S02. Web Download. Philadelphia: Linguistic Data Consortium, 2008.
Related Works: View


This file contains documentation for CSLU: Nattional Cellular Telephone Speech Release 2.3, Linguistic Data Consortium (LDC) catalog number LDC2008S02 and isbn 1-58563-467-0.

CSLU: National Cellular Telephone Speech Release 2.3 was created by the Center for Spoken Language Understanding (CSLU) at OGI School of Science and Engineering, Oregon Health and Science University, Beaverton, Oregon. It consists of cellular telephone speech and corresponding transcripts, specifically, approximately one minute of speech from 2336 speakers calling from locations throughout the United States. The data collection protocol used for this release is the same protocol used in CSLU: Portland Cellular Telephone Speech Version 1.3 (LDC2008S01).

Speakers called the CSLU data collection system on cellular telephones, and they were asked a series of questions. Two prompt protocols were used: an In Vehicle Protocol for speakers calling from inside a vehicle and a Not in Vehicle Protocol for those calling from outside a vehicle. The protocols shared several questions, but each protocol contained distinct queries designed to probe the conditions of the caller's in vehicle/not in vehicle surroundings.

Recording Details

The data were collected with the CSLU T1 digital data collection system. The sampling rate was 8khz, and the files were stored in 8 bit mu-law format on a UNIX file system. In this release, the files are provided in 16-bit linearly encoded Windows wav (riff) format.


The text transcriptions in this corpus were produced using the non time-aligned word-level conventions described in The CSLU Labeling Guide, which is included in the documentation for this release. CSLU: National Cellular Telephone Speech Release 2.3 contains orthographic and phonetic transcriptions of corresponding speech files. Non time-aligned orthographic transcriptions provide quick access to the content of an utterance; they may contain markers for word boundaries to support access and retrieval at the lexical level. Phonetic/phonemic transcriptions represent the phonetic content of an utterance at a given level of detail that is made explicit by the use of diacritics. Phonetic phenomena transcribed includes excessive nasalization, glottalization, frication on a stop, centralization, lateralization, rounding and palatalization.


For an example of the data in this corpus, please listen to the following audio samples:

Available Media

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