Authors: John S. Garofolo, Lori F. Lamel, William M. Fisher, Jonathan G. Fiscus, David S. Pallett, Nancy L. Dahlgren, and Victor Zue
LDC Catalog No.: LDC96S32
ISBN: 1-58563-090-X
Data Type: speech
Sample Rate: 16000 Hz
Sampling Format: 1-channel pcm
Data Source(s): microphone speech
Application(s): speech recognition
Language(s): English
Language ID(s): ENG
Distribution: 1 CD
Member fee: $0 for 1996 members
Non-member Fee: US $250.00
Reduced-License Fee: US $250.00
Extra-Copy Fee: US $250.00
Non-member License: yes
Readme File: yes
Online documentation: yes
Licensing Instructions: Subscription & Standard Members, and Non-Members
Citation: John S. Garofolo, et al.
Linguistic Data Consortium, Philadelphia

The FFMTIMIT corpus contains the previously unreleased secondary microphone waveforms for the TIMIT Acoustic-Phonetic Continuous Speech corpus. The primary microphone waveforms, which were recorded using a close-talking noise-cancelling head-mounted Sennheiser microphone (model HMD-414), are available from the LDC on NIST Speech Disc 1-1.1 (LDC93S1). The secondary microphone used in the recording of the TIMIT corpus was a Breul & Kjaer 1/2" free-field microphone (model 4165).

While the Sennheiser microphone recordings are relatively "clean" with respect to non-speech noise, the FFMTIMIT recordings includes significant low frequency noise, which was due to the HVAC system and mechanical vibration transmitted through the floor of the double-walled sound booth used in recording. Because it is noiser than its TIMIT counterpart, the data of FFMTIMIT may be used in the development of more noise-robust speech recognition systems. In addition, this data may be of value to researchers involved in vocal tract modeling because the B&K microphone has extremely flat free-field frequency response and calibration tones are provided.

Note that the B&K TIMIT data contained with this release has not been processed through any highpass filter, (e.g., the 1,581-point filter described in the paper "The DARPA Speech Recognition Research Database" by Fisher, Doddington and Goudie-Marshall in "DARPA TIMIT Acoustic-Phonetic Continuous Speech Corpus CD-ROM," NISTIR 4930 / NTIS Order No. PB93- 173938.)

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