CORPORA from CSLU: SR4X v1.2
OHSU # 0681-P
- CSLU, SOM CSLU
This corpus is a collection of 36 speakers saying eleven words six times on four different channels.
The data was captured digitally from the CSLU T1 connection, and saved as 8 khz 8-bit ulaw.
There were four different recording channels used to call the T1 data line. They were:
- office telephone
- home telephone
- carbon microphone telephone
- speaker phone
All of the data use the RIFF standard file format. This file format is 16-bit linearly encoded.
There are five top-level directories in this distribution:
- docs -- the docs directory contains assorted documentation files
- labels -- the labels directory contains time align phonetic transcriptions
- misc -- the misc directory contains scripts and archival information
- speech -- the speech directory contains the .wav files containing speech data
- trans -- the trans directory contains .txt files containing transcriptions of the corresponding .wav files in the speech directory
The speech and trans directories contain the data files, which have the following name structure:
xxxx = call number
tttt = utterance code
c = channel type
yy = arbitrary serial number
zzz = file extension (txt/wav)
This utterance is from caller 1030 and consists of the word "computer". It was recorded on channel four and the serial number was 42. The serial numbers were used to differentiate between different instances of the same utterance by the same speaker.
The audio files are subdivided into directories based on their call number. So, this call would be found in /sr4x/speech/1030.
There were no orthographic transcriptions done, but automatically generated word-level transcriptions do exist. In addition, each call was verified and categorized as: good, bad, noisy or different. A detailed description of the categories can be found in the SR4X publication.
Agreement was about 85%. The following confusion matrix shows where most of the confusions occurred.
good bad noisy diff
good 6877 0 314 628
bad 31 45 0 2
noisy 142 3 414 60
good 119 6 25 3
The Center for Spoken Language Understanding (CSLU) distributes corpora to commercial entities and academic institutions for a fee. Commercial entities can use these corpora for research but also for creating commercial products such as generating acoustic models for speech recognition.
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For demos and more information, visit the CSLU Corpora website at:
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Senior Technology Development Manager