Noise can interfere with our ability to communicate. Many noises that are not intense enough to cause hearing impairment can interfere with speech communication. The interference or masking effect is a complicated function of the distance between the speaker and listener and the frequency components of the spoken words. The speech interference level (SIL) is a measure of the difficulty in communication that is expected with different background noise levels. Now analysis talk in terms of A-weighted background noise levels and the quality of speech communication (Figure 6.3.3).
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