Abstract
The effect of tonal components on loudness and noisiness of wide-band noise is considered by means of two psychoacoustical experiments. In the first experiment, synthesized complex sound consisting of a wide-band noise and a pure tone was used as a test stimulus. In the second experiment, several environmental noises with accompanying tonal components as well as the noises with the tonal components eliminated by a filter were used as test stimuli. The experimental results are compared with the effects estimated by several methods such as L A, PLdB(dB E), PNdB, and Zwicker's Loudness Level. The major results obtained are as follows: (1) the effect of the tonal components on the loudness and the noisiness is generally smaller than that estimated by measures such as L A, LL(Z), PLdB and PNdB; (2) Zwicker's Loudness Level competently evaluates the effect of the tonal components on the loudness and the noisiness of the test stimuli used in our experiment. These results show that the conventional positive tone correction is not always required in the evaluation of environmental noise.
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