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从探讨人耳在噪声背景中听测具有复杂时间-频率结构的主动声呐信号的模型出发,研究了人耳对信号频率发生短时间变化的听觉敏感性.根据在850—1130Hz频段内的测量结果,得出了人耳听觉对频率变化响应的模糊区域由τ△F=1—2决定,这里τ是频率发生变化的时间间隔,△F为频率变化的差值.当τ△F≤1时,人耳感觉不到频率短时间的变化;当τ△F≥2时,人耳不仅能明显分辨频率发生过短时间的变化,而且能对两个频率有不同的音调感觉。
Starting from the model of human ear hearing active sonar signal with complex time-frequency structure in the background of noise, the auditory sensitivity of human ear to short-term changes of signal frequency was studied.According to the measurement results in 850-1130Hz band , It is concluded that the fuzzy region of human ear response to frequency change is determined by τΔF = 1-2, where τ is the time interval of frequency change and ΔF is the difference of frequency change.When τΔF≤1 , The human ear can not feel the frequency of short changes; when τ △ F ≥ 2, the human ear can not only clearly distinguish the frequency of occurrence of short changes in time, but also have two different frequency tones.