The TIMIT corpus provides a time-aligned transcription, meaning each phone is explicitly associated with a start and end time in the audio waveform.

TIMIT Corpus Time-Aligned Transcription

- a joint project between Texas Instruments(TI), MIT, and SRI.
- includes 6300 read sentences, with 10 sentences each from 630 speakers. The 6300 sentences were drawn from a set of 2342 sentences, some selected to have particular dialect shibboleths, others to maximize phonetic diphone coverage.
- each sentence in the corpus was phonetically hand-labeled, the sequence of phones was automatically aligned with the sentence wave file, and then the automatic phone boundaries were manually hand-correct.

San Jose State University

Saint Olaf College

- A collection of waveforms is hand-labeled with the corresponding string of phones. 

Phonetically annotated corpus

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Speech and Language Processing (3rd ed. draft) 

TIMIT corpus

- consists of 3.5 hours of sentences extracted from the Switchboard corpus, together with transcriptions time-aligned at the syllable level. 


Switchboard Transcription Project

- a phonetically transcribed corpus of spontaneous American speech, containing about 300,000 words from 40 talkers.

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