Growth of Noisiness for Tones and Bands of Noise at Different Frequencies

摘要

Judgment tests were conducted to measure the growth of noisiness for tones and narrow bands of noise under various listening conditions. The growth of noisiness for a 1 kHz tone and an octave band of noise centered at 1 kHz were measured using both the method of adjustment and a magnitude estimation method. Equal noisiness contours were determined for selected listening conditions in order to measure the growth of noisiness at frequencies other than 1 kHz. The growth of noisiness was found to depend strongly on test method with the magnitude estimation tests giving significantly larger values for doubling or halving of perceived noisiness. Equal noisiness contours are shown for pure tones in a free field, one-third octave bands of noise in a free field and one-third octave bands of noise in a diffuse field. It was concluded that the specific value used for the growth of noisiness did not significantly affect the calculation of the relative PNL values for many different spectra. (Author)