loud clap sound can make sounds inaudible immediately preceding or following. The effect of backward masking is weaker than forward masking. The masking effect has been widely studied in psychoacoustical research and are exploited in lossy audio encoding, such as MP3.

Missing fundamental

When presented with a harmonic series of frequencies in the relationship 2f, 3f, 4f, 5f, etc. (where f is a specific

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