Accession Number : ADA313941

Title :   Effect of Digital Recording Parameters on Discrimination Features of Acoustic Signals in Noise.

Corporate Author : NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT

Personal Author(s) : Santoro, Thomas S. ; Russotti, Joseph S. ; Hanna, Thomas E.

PDF Url : ADA313941

Report Date : 11 APR 1996

Pagination or Media Count : 17

Abstract : An experiment was performed to determine the effects of digital signal processing sample rate and quantization code on auditory perception of sonar signals. Fifteen sonar signals were sampled and played back under nine conditions of sample rate and quantization code. In each condition all pairwise combinations of these signals in noise were presented to 35 subjects in an ABX discrimination task. The resulting matrices of discrimination errors were analyzed by multidimensional scaling. The first two scaling dimensions recovered in order of statistical significance were associated with perceptions related to (1) signal beat at low frequencies and (2) signal spectral shape in the higher frequencies. Further recovered dimensions were related to particular temporal modulation of individual signals. The importance of the first three discrimination features depended on the three sample rate conditions. Each halving of the sample rate removed one of the features from any significant contribution to the discrimination task. The quantization conditions had little influence on the significance of the discrimination features except for the mid-range sample rate (6.25 kHz).

Descriptors :   *PARAMETERS, *ACOUSTIC SIGNALS, *SONAR SIGNALS, *DIGITAL RECORDING SYSTEMS, *PITCH DISCRIMINATION, SIGNAL PROCESSING, HIGH FREQUENCY, FREQUENCY MODULATION, SCALING FACTOR, SAMPLING, QUANTIZATION, NAVAL RESEARCH LABORATORIES, TARGET DETECTION, SUBMARINES, LOW FREQUENCY, BEAT SIGNALS, NOISE(SOUND), AUDITORY PERCEPTION, UNDERWATER SOUND SIGNALS, UNDERWATER TARGETS.

Subject Categories : Acoustics
      Undersea and Antisubmarine Warfare

Distribution Statement : APPROVED FOR PUBLIC RELEASE