The masked sound appears simultaneously with the masking sound, and the resulting masking is called simultaneous masking. The masked sound is in front, and the masking sound is called back masking. If the masking sound is in front, the masked sound is called the front masking. In practice, the post-masking phenomenon is more common and appears to be more important. For example, the masking of the direct reverberation sound of the indoor reverberation sound belongs to the back masking. The closer the masked sound is to the masking sound in time, the more the hearing threshold is increased. Generally, the effect of the rear masking is greater than that of the front masking, and the masking effect is greater than the masking effect of the back masking and the front masking.
The masking effect caused by a pure tone is determined by its intensity and frequency. The low frequency sound effectively masks the high frequency sound, while the masking effect of the high frequency sound on the low frequency sound is not very large. The masking effect experiment with narrow-band noise shows that the maximum masking amount appears near the masking audio frequency, and the masking amount increases with the enhancement of the masking sound.
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