THE CODE COPYING CAPABILITIES OF RADIOMEN UNDER SIMULATED ATMOSPHERIC NOISE CONDITIONS
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
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The code-copying ability of Navy radiomen at various signal-to-noise SN ratios under four conditions of simulated atmospheric noise, and under white noise, was tested. It was found that when a white noise was used, a critical SN ration was reached where code copy deteriorated markedly. Prior to this point, code copy appeared to be undisturbed. When the simulated atmospherics were used, no appreciable deterioration in code copy occurred at any of the SN ratios sampled. It was pointed out, however, that equivalent S N ratios for white and atmospheric noise are not necessarily the same. Therefore, qualifications must be made to a direct comparative analysis between simulated atmospherics and white noise maskers. It was further pointed out that if the SN ratios for the atmospherics were lowered, some critical SN might have been reached, as in the case of white noise, where code copy deteriorated rapidly. If this were the case, then a simple reduction of X decibels would be all that was necessary to generalize the obtained performance criteria obtained under white noise to atmospherics.
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