|The NTIMIT corpus was developed by the NYNEX Science and Technology
Speech Communication Group to provide a telephone bandwidth adjunct to
NTIMIT was collected by transmitting all 6,300 original TIMIT
recordings through a telephone handset and over various channels in
the NYNEX telephone network and redigitizing them. The recordings
were transmitted through ten Local Access and Transport Areas, half of
which required the use of long-distance carriers.
In order to calibrate the transmission characteristics of the various
channels, stationary 1 kHz and frequency-sweeping tones were also
recorded for each of the transmission channels. These are found on
The re-recorded waveforms were time-aligned with the original TIMIT
waveforms so that the TIMIT time-aligned transcriptions can be used
with the NTIMIT corpus as well. In additiont to the documentation on
the disc, see Jankowski et al., "NTIMIT: A Phonetically Balanced,
Continuous Speech, Telephone Bandwidth Speech Database," Proc.
ICASSP-90, April 1990. NYNEX retains full copyright on the corpus and
all associated materials.