TIMIT: Acoustic-Phonetic Continuous Speech Corpus with 630 Speakers

The TIMIT corpus provides broadband recordings of 630 speakers from eight major American English dialects, each reading ten phonetically rich sentences. It was created through a joint effort by MIT, SRI International, and Texas Instruments, with recordings made at TI and transcriptions verified at MIT and NIST. The corpus includes time-aligned orthographic, phonetic, and word transcriptions alongside 16-bit, 16kHz speech waveform files for each utterance.

Use Cases

• Train and benchmark automatic speech recognition models based on time-aligned phonetic transcriptions.
• Study acoustic-phonetic variation and dialectal differences based on recordings from eight major American English dialects.
• Develop and test speech synthesis systems using phonetically rich, hand-verified sentence recordings.
• Research phonetic alignment algorithms using the provided time-aligned orthographic, phonetic, and word transcriptions.

Strengths

• Contains 630 speakers, providing a substantial sample size for analysis.
• Includes eight major dialects of American English, offering dialectal coverage.
• Each utterance has hand-verified, time-aligned orthographic, phonetic, and word transcriptions.
• Corpus design and verification involved multiple authoritative institutions (MIT, SRI, TI, NIST).

Limitations

• Row count and dataset size are unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• Last update date is unknown; freshness unverified.

Provenance

Source

Joint project by Massachusetts Institute of Technology (MIT), SRI International (SRI), and Texas Instruments, Inc. (TI). Recordings at TI, transcriptions at MIT, verification and CD-ROM production by NIST.

Collection Method

Broadband recordings of speakers reading phonetically rich sentences, with subsequent hand verification of transcriptions.

Time Range

Portions © 1993 Trustees of the University of Pennsylvania.

Freshness

Last updated date is unknown.

Geography

United States (eight major dialects of American English).