The auditory characteristic of the human ear refers to the psychological reflection of the human voice on the sound. The auditory characteristics of the human ear reflect the degree of human sensitivity to the sound intensity at different frequencies. The human ear is less sensitive to the high-end (above 600HZ) and low-end (below 500HZ) frequencies when it is small, but to 3000HZ-4000HZ. The frequency sensitivity is the strongest. And the smaller the volume of the sound, the more obvious this feature is. People describe this feature as a curve, which is the equal loudness curve of the sound. In audio equipment, there is a common loudness switch, which functions to properly raise or compensate the high and low sounds at a small volume.
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