Rippled spectrum discrimination in noise: Effects of compression

O. Milekhina, D. Nechaev, V. Popov, A. Supin
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Abstract

In psychophysical experiments, cochlear compression can be derived by the comparison of on- and low-frequency masking, assuming that in the signal representation, the responses to both the signal and on-frequency masker are equally compressed while the response to the low-frequency masker is not compressed. In the present study, this approach was used to assess the influence of compression on the discrimination of complex signal spectra. The signals were rippled noise, 0.38-oct wide, centered at 2 kHz, 40 to 90 dB SPL. The ripple-density discrimination limit was measured using the ripple-phase reversal test. The simultaneous maskers were 0.5-oct wide noise centered either at the signal frequency (on-frequency) or 0.75-oct below the signal (low-frequency). Increase in the masker level resulted in a decrease in the ripple-density resolution limit. The growth of the on-frequency masker was approximately 1:1. The growth of the low-frequency masker revealed no compression at signal levels from 40 to 50 dB, and...
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噪声中的波纹频谱识别:压缩效应
在心理物理实验中,耳蜗压缩可以通过对高频掩蔽和低频掩蔽的比较得到,假设在信号表示中,对信号和低频掩蔽的响应都被同等压缩,而对低频掩蔽的响应不被压缩。在本研究中,该方法被用于评估压缩对复杂信号频谱识别的影响。信号为波纹噪声,宽0.38 oct,中心为2 kHz, 40至90 dB SPL。用纹波相位反转试验测定了纹波密度判别限。同时的掩模是0.5 oct宽的噪声,中心在信号频率(on-frequency)或信号下方0.75 oct (low-frequency)。掩膜水平的增加导致纹波密度分辨率极限的降低。频率掩模的生长约为1:1。低频掩模的生长表明,在40 ~ 50 dB的信号电平范围内,低频掩模没有被压缩。
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