The covert effect is the phenomenon that while listening to one sound, it is invisible because it is covered by another sound (called hidden sound). The closer the frequency of the masked sound is to the masking sound, the greater the amount of concealment; the sound pressure of the masking sound The higher the level, the larger the masking amount; the low frequency sound is easy to conceal the high frequency sound, and the high frequency sound is difficult to mask the low frequency sound. During the music process, people do not feel the noise, but when the music stops or the sound breaks, people can feel the background noise emitted by the speaker. This effect is the masking effect.
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