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(term) comb filtering

Discussion in 'Glossary of Terms' started by audiokid, Feb 13, 2017.

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  1. audiokid

    audiokid Chris Staff

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    In acoustics, comb filtering can arise in some unwanted ways. For instance, when two loudspeakers are playing the same signal at different distances from the listener, there is a comb filtering effect on the signal. In any enclosed space, listeners hear a mixture of direct sound and reflected sound. Because the reflected sound takes a longer path, it constitutes a delayed version of the direct sound and a comb filter is created where the two combine at the listener.

    In signal processing, a comb filter adds a delayed version of a signal to itself, causing constructive and destructive interference. The frequency response of a comb filter consists of a series of regularly spaced notches, giving the appearance of a comb.

    See

    Master Handbook of Acoustics, Sixth Edition 6th Edition

    51QUN58yADL._SX397_BO1,204,203,200_.jpg

    and https://en.wikipedia.org/wiki/Comb_filter
     

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