PURDUE SPEECH INTENSITY DEMONSTRATOR.
Abstract
In speech intelligibility measurements, the signal-to-noise barrier ratio has been demonstrated as an important factor. Different types of meters have been designed to give an indication of this ratio, but a method was needed of showing each speaker in a more highly motivating and positive manner his voice level and signal-to-noise barrier ratio. Because these are such important factors, an instrument called the Purdue Speech Intensity Demonstrator (SID) was designed to indicate such characteristics to the trainee. This instrument provides the voice communication trainee with a visual indication of voice level and signal-to-noise barrier ratio. The Purdue SID demonstrates to the trainee by a series of neon bulbs the actual signal level and signal to noise ratio in a given circuit; or the device can demonstrate the speech level only, the noise level only, or any desired difference between the speech and noise for instruction purposes. The report is restricted to a description of the electrical characteristics and of the calibration procedure of the demonstrator. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1948
- Accession Number
- AD0638353
Entities
People
- G. L. Draegert
- H. W. Nordyke
- J. C. Kelly
- T. D. Hanley
Organizations
- Purdue University