Accession Number : AD0783867

Title :   An Audio Display of Processed Acoustic Signals.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Mager,George Liell , Jr

Report Date : JUN 1974

Pagination or Media Count : 82

Abstract : An audio display system using eight tones to encode the output of a digital signal processor is investigated. The purpose of the system is to detect and display an audio tone masked by bandlimited Gaussian noise. The digital processor performs a spectral analysis on the signal using a Fast Fourier Transform. Several hundred experiments were performed using a human listener to monitor the display. The experimental system is capable of displaying the difference between signal, no signal, and signal plus noise conditions. About 80% probability of correct decision by the human observer was achieved for input signals below the detection threshold for an unaided listener. Possible applications to a sonar system are indicated. (Author)

Descriptors :   *Display systems, *Sonar equipment, *Target acquisition, Acoustic signals, Signal processing, Audio tones, Coding, Computer programs, Noise, Spectrum analysis, Theses, Fourier transformation

Subject Categories : Acoustic Detection and Detectors
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE