Accession Number:

AD0647249

Title:

STUDY OF THE ABILITY OF LISTENERS TO DETECT FM SLIDES BY AUDITORY CUES.

Descriptive Note:

Summary rept.,

Corporate Author:

TRACOR INC AUSTIN TEX

Personal Author(s):

Report Date:

1967-01-01

Pagination or Media Count:

45.0

Abstract:

Some individuals who have listened to CW and FM signals reported that FM slides are more detectable than CW pulses. The present study, however, shows that, when a difference in detectability exists, the CW pulse is more detectable than the FM slide. At the same time, FM Linear slides are more detectable than FM Housetop slides. The mechanisms underlying such differences are not clearly established. Those who report that FM slides are more detectable than CW pulses might well be responding to the uniqueness of the slides at an intensity which is above that which would produce marginal detection performance. There can be little doubt that FM slides are more outstanding or more unusual than CW pulses when they are presented at fairly high signal-to-noise ratios. At lower levels, the FM slides could well sound more like the noise than do the CW pulses since the noise, like the slides, is varying in frequency during the signal interval. The CW pulse, on the other hand, is fixed in frequency in a background of varying noise. Author

Subject Categories:

  • Active and Passive Radar Detection and Equipment
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE