Wilson A S, Hall J W, Grose J H
Division of Otolaryngology, University of North Carolina Medical School, Chapel Hill 27599.
J Acoust Soc Am. 1990 Sep;88(3):1333-8. doi: 10.1121/1.399710.
A series of three experiments was undertaken to investigate detection of sinusoidal frequency modulation (FM) in the presence of FM at a separate frequency. The first experiment measured detection of modulation for an FM tone with a modulation frequency (fm) of 6 Hz as a function of carrier frequency (fc) under three conditions: (1) in quiet, (2) in the presence of a 2500-Hz pure tone, and (3) in the presence of a 2500-Hz FM tone with fm = 6 Hz, modulating in phase with the signal. Detection of FM in the presence of the second FM tone was worse than for either the signal presented in quiet or in the presence of the unmodulated tone. Threshold varied as an inverse function of frequency separation between the signal and the masker. In the second experiment, FM detection for a signal with fc = 1900 Hz and fm = 6 Hz was measured as a function of the modulation frequency (fm = 2-18 Hz) of the 2500-Hz masker tone. FM detection improved significantly with increasing difference between the modulation frequencies of the signal and the masker. The final experiment measured detection of FM for a signal (fc = 1900 Hz, fm = 6 Hz) in the presence of a second FM tone (fc = 2500 Hz, fm = 6 Hz) as a function of the relative phase of the 6-Hz modulators. Detection of FM improved monotonically as a function of increasing phase difference between the two modulators. The results are discussed in terms of modulation detection interference and perceptual grouping.
进行了一系列三个实验，以研究在存在另一个频率的调频（FM）情况下对正弦调频的检测。第一个实验测量了在三种条件下，调制频率（fm）为6 Hz的调频音的调制检测作为载波频率（fc）的函数：（1）在安静环境中；（2）在存在2500 Hz纯音的情况下；（3）在存在调制频率fm = 6 Hz且与信号同相调制的2500 Hz调频音的情况下。在存在第二个调频音的情况下对调频的检测比在安静环境中呈现信号或存在未调制音时要差。阈值随信号与掩蔽音之间频率间隔的倒数函数而变化。在第二个实验中，测量了载波频率fc = 1900 Hz且调制频率fm = 6 Hz的信号的调频检测作为2500 Hz掩蔽音的调制频率（fm = 2 - 18 Hz）的函数。随着信号与掩蔽音调制频率之间差异的增加，调频检测显著改善。最后一个实验测量了在存在第二个调频音（fc = 2500 Hz，fm = 6 Hz）的情况下，信号（fc = 1900 Hz，fm = 6 Hz）的调频检测作为6 Hz调制器相对相位的函数。调频检测随着两个调制器之间相位差的增加而单调改善。根据调制检测干扰和感知分组对结果进行了讨论。
