CSLU: Alphadigit Version 1.3

<h3>Introduction</h3> <p>This file contains documentation for CSLU: Alphadigit Version 1.3 , Linguistic Data Consortium (LDC) catalog number LDC2008S06 and isbn 1-58563-478-6. </p> <p>Alphadigit Version 1.3 is a collection of 78,044 utterances from 3,025 speakers saying six-digit strings of letters and digits over the telephone for a total of approximately 82 hours of speech. Each speech file has corresponding orthographic and phonemic transcriptions. This corpus was created by the Center for Spoken Language Understanding (CSLU), Oregon Health &amp; Science University, Beaverton, Oregon.</p> <h3>Data</h3> <p>Speakers were recruited using USEnet postings. Respondents registered for the collection by completing an online form. Once registered, they received a list of 18-29 six-digit strings (e.g., "a 2 b 4 5 g") and participation instructions. Speakers called the CSLU data collection system by dialing a toll-free number and were prompted for each string; 1102 different strings were used throughout the course of the data collection. The lists were set up to balance for phonetic context between all letter and digit pairs. </p> <p>The data were recorded directly from a digital phone line without digital-to-analog or analog-to-digital conversion at the recording end using 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. The files have been converted to RIFF standard file format, 16-bit linearly encoded.</p> <h3>Transcription</h3> <p> All of the files included in this corpus have corresponding non-time-aligned word-level transcriptions and time aligned phoneme-level transcriptions (automatic forced alignment) that comply with the conventions in the CSLU Labeling Guide. 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 include excessive nasalization, glottalization, frication on a stop, centralization, lateralization, rounding and palatalization.</p> <h3>Samples</h3> <p>For an example of the speech contained in this corpus, please listen to this <a href="./desc/addenda/LDC2008S06.wav" rel="nofollow">audio sample</a> (MS wave). </p> </br>
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