JUDGED NOISINESS OF A BAND OF RANDOM NOISE CONTAINING AN AUDIBLE PURE TONE

The experiments reported were designed to obtain further data on the perceived noisiness of complex sounds consisting of a steady-state pure tone imbedded in a background of random noise. From these data, a method for including a “pure-tone correction factor” in the calculation of perceived noisiness in PNdB is derived. The proposed procedure should have practical application for the evaluation of sounds from modern-day jet aircraft or other broad-band sounds that may contain relatively intense, audible pure-tone components. Various problems involved in the measurement and interpretation of band spectra for the location of steady-state pure-tone components in broad-band random noise are discussed.