Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers
Intrinsic envelope fluctuations and modulation-detection thresholds for narrow-band noise carriers
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DOI：
10.1121/1.428103
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发表时间：
1999-11-01
影响因子：
2.4
通讯作者：
Kohlrausch, A
中科院分区：
文献类型：
--
作者：
Dau, T;Verhey, J;Kohlrausch, A
提出了一个模型，该模型计算调谐到特定调制频率的假设调制滤波器的通带内带通噪声载波的固有包络功率。将模型预测与实验获得的调幅 (AM) 检测阈值进行比较。在实验1中，获得了对带通高斯噪声载波施加5、25和100 Hz调制率的阈值，其固定上限截止频率为6 kHz，带宽在1到6000 Hz范围内。实验2中，以三种具有不同固有涨落谱的噪声作为载体：高斯噪声、倍增噪声和低噪声噪声。在每种情况下，载波的频谱中心位于 5 kHz，带宽为 50 Hz。 BM 检测阈值是针对 10、20、30、50、70 和 100 Hz 的调制频率获得的。调谐到信号调制频率的调制滤波器输出处的载波固有包络功率似乎为 AM 检测阈值提供了良好的估计。将结果与 Dau 等人基于更复杂的听觉处理模型的预测进行了比较。 [J。声学。秒。是。 99, 3615-3622 (1497)]。 (C) 1999 年美国声学学会。 [S0001-4966(99)02611-9]。
A model is presented which calculates the intrinsic envelope power of a bandpass noise carrier within the passband of a hypothetical modulation filter tuned to a specific modulation frequency. Model predictions are compared to experimentally obtained amplitude modulation (AM) detection thresholds. In experiment 1, thresholds for modulation rates of 5, 25, and 100 Hz imposed on a bandpass Gaussian noise carrier with a fixed upper cutoff frequency of 6 kHz and a bandwidth in the range from 1 to 6000 Hz were obtained. In experiment 2, three noises with different spectra of the intrinsic fluctuations served as the carrier: Gaussian noise, multiplied noise, and low-noise noise. In each case, the carrier was spectrally centered at 5 kHz and had a bandwidth of 50 Hz. The BM detection thresholds were obtained for modulation frequencies of 10, 20, 30, 50, 70, and 100 Hz. The intrinsic envelope power of the carrier at the output of the modulation filter tuned to the signal modulation frequency appears to provide a good estimate for AM detection threshold. The results are compared with predictions on the basis of the more complex auditory processing model by Dau et al. [J. Acoust. Sec. Am. 99, 3615-3622 (1497)]. (C) 1999 Acoustical Society of America. [S0001-4966(99)02611-9].