A LABORATORY STANDARD SIGNAL-TO-NOISE EQUALIZER
Abstract
An instrument is described which was designed to measure and equate the peak voltage of a word, or the average peak voltage of a group of words, with the rms voltage of suitably filtered Gaussian noise in such a way as to produce a well-defined standard signal-to-noise ratio of zero db. Relative to this zero standard r atio, any practical signal-to-noise ratio may be obtained by adjusting either the noise or the speech channel attenuators. An increase in the attenuation of the noise or a decrease in the attenuation of the speech will have the effect of increasing the signal-to-noise ratio. The important features of this instrument are: (1) a panel meter provides a continuous measurement of the Gaussian noise so that during playback or recording of an experimental tape through the laboratory standard, the signal-to-noise ratio may be checked and maintained constant (2) a five-channel instantaneous amplitude-discriminator measures and standardizes the auditory input to the laboratory standard whereby variations in speech-peaks may be checked, and corrected if desired, and (3) both the noise meter and the amplitude-discriminator monitor the operation of the laboratory standard continuously to ensure that a constant signal-to-noise ratio is maintained. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1960
- Accession Number
- AD0260458
Entities
People
- Anthony K. Newman
Organizations
- Ohio State University