[Discrimination of spectral patterns of sound signals in conditions of interfering noise].
The method of probes with rippled spectra makes possible to measure the frequency resolving power (FRP) of human hearing using no frequency-selective masking techniques. This allows studying the influence of interfering noises on the FRP. In conditions of diotic presentation (parallel to both ears), FRP markedly decreases on- or low-frequency noise markedly decreases FRP. The dependence of this effect on sound intensity and noise-to-probe ratio is different for the on- and low-frequence noise, which indicates different mechanisms of action of these two kinds of interfering noise. However, in both cases, a loud enough interfering noise results in complete inability to discriminate the fine spectral pattern of the probe. On the contrary, in conditions of dichotic presentation (the probe to one ear and the noise to the other), the interfering noise does not influence FRP noticeably within a wide range of frequency relations of the probe and noise and noise-to-probe level ratios. Thus, almost entire dichotic release of influence of interfering noise on FRP takes place. This feature can be used for designing bearing aids.
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D000161:Acoustic Stimulation; D000818:Animals; D001309:Auditory Threshold / Q000502:physiology*; D006310:Hearing Aids; D034381:Hearing Loss; D006801:Humans; D009622:Noise; D010470:Perceptual Masking / Q000502:physiology*