The new PT-2E pressure transducer from Glottal Enterprises is a totally new replacement for the PTW-1, for use in measuring voice airflow using a Glottal Enterprises CV mask. When used with a mask for airflow measurement, it features a 60% shorter response time (equivalent to a 60% broader frequency response), and a noise level and temperature drift approximately half that of the PTW-1. We can supply the PT-2E in a model (voltage, sensitivity, pin connection) that is directly interchangeable with any older PTW transducer.
Glottal Enterprises Pressure Transducer Specifications:
- Frequency response at the main port flat to within 1dB to 4000 Hz. (The PTW-1 has a flat response to 2500 Hz at the main port.)
- Response time in a differential pressure-sensing mode, as in an inverse filter application, of less than 0.15 ms. (Compared to approximately 0.25 ms for the PTW-1.)
- Noise level with respect to an average voice airflow waveform of –46 dB (-40 dB if powered by USB power). This is 6dB better than the PTW-1 transducer.
- Negligible temperature-induced drift after a 15-minute warm-up period.
- Sturdy machined aluminum case, including the main port nipple (previously plastic).
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The figure below shows a comparison of mask airflow waveforms, inverse filtered using the Glottal Enterprises Waveview program, from the new PT-2E (in blue) and the PTW-1 (in red where they are significantly different during the center glottal cycle), for a typical voice filtered mask signal.
The waveforms were recorded simultaneously for an adult male subject with a strong voice and good vocal fold closure. Amplitudes and zero levels were matched to within about 3%, and the same filter settings were used for both waveforms. It can be seen that the PT-2E yielded a flatter trace during the period of glottal closure and a trace that, because of the reduced response time, followed more closely the abrupt closure of the vocal folds in this strong voice (within the green circle).
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