FFMTIMIT

<p>FFMTIMIT contains the previously unreleased secondary microphone waveforms for TIMIT Acoustic-Phonetic Continuous Speech. The primary microphone waveforms, which were recorded using a close-talking noise-cancelling head-mounted Sennheiser microphone (model HMD-414), are available from LDC on NIST Speech Disc 1-1.1 (<a href="http://catalog.ldc.upenn.edu/LDC93S1" rel="nofollow">LDC93S1</a>). The secondary microphone used in the recording of the TIMIT corpus was a Breul &amp; Kjaer (B&amp;K) 1/2" free-field microphone (model 4165).</p><br>
<p>While the Sennheiser microphone recordings are relatively "clean" with respect to non-speech noise, the FFMTIMIT recordings include 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&amp;K microphone has extremely flat free-field frequency response and calibration tones are provided.</p><br>
<p>Note that the B&amp;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.)</p></br>