论文部分内容阅读
通过心理物理实验探讨了包络调制率(<300 Hz)和纯音载波频率(<8 kHz)对听觉时间调制检测能力的影响.测试信号为以纯音为载波的正弦幅度调制信号,采用二选一强迫选择法和自适应调整步长的心理物理实验方法,测试得到不同载波频率条件下的时间调制传递函数.实验结果表明,包络调制率和载波频率均会对听觉的时间调制检测能力产生影响.当载波频率低于2 kHz时,人耳的检测能力与调制率呈单调递增趋势;当载波频率高于3.5 kHz时,检测能力也会受到调制率的显著影响,但没有显著的单调变化趋势.当调制率在10—100 Hz之间时,检测能力不随载波频率明显变化;当调制率在150—300 Hz之间时,调制检测能力随着载波频率上升而下降,在载波频率达到3.5kHz时,调制检测能力不随载波频率显著改变.
The effects of envelope modulation rate (<300 Hz) and pure tone carrier frequency (<8 kHz) on auditory time modulation detection were discussed through psychophysical experiments.The test signal was sinusoidal amplitude modulated signal with pure tone as carrier, Forced selection method and self-adaptive step-by-step psychophysical experiment were used to test the time-modulated transfer function under different carrier frequencies.The experimental results show that both the envelope modulation rate and the carrier frequency have an impact on the temporal modulation detection ability When the carrier frequency is lower than 2 kHz, the detection capability and modulation rate of the human ear show a monotonous increasing trend. When the carrier frequency is higher than 3.5 kHz, the detection capability will be significantly affected by the modulation rate, but there is no significant monotonic change trend When the modulation rate is between 10-100 Hz, the detection capability does not change significantly with the carrier frequency; when the modulation rate is between 150-300 Hz, the modulation detection capability decreases as the carrier frequency increases. When the carrier frequency reaches 3.5 kHz , The modulation detection capability does not significantly change with the carrier frequency.