ACOUSTIC NOISE MEASUREMENTS UNDER FREE-FIELD CONDITIONS.
Research and development technical rept.,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
Pagination or Media Count:
There is an increasing requirement by the field forces for new power source systems which operate silently. A method is described for the determination of equipment acoustic noise by octave-band analysis under free-field conditions. A procedure based on critical band theory is discussed for the establishment of masked threshold criteria to evaluate equipment sound pressure levels SPL. Preferred octave-band spectra are given in terms of 20-foot sound pressure levels which correspond to the just audible noise for listeners at 50 and 100 feet for a jungle environment. Author
- Electric Power Production and Distribution