Precedence effect
Psychoacoustical phenomenon / From Wikipedia, the free encyclopedia
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The precedence effect or law of the first wavefront is a binaural psychoacoustical effect concerning sound reflection and the perception of echoes. When two versions of the same sound presented are separated by a sufficiently short time delay (below the listener's echo threshold), listeners perceive a single auditory event; its perceived spatial location is dominated by the location of the first-arriving sound (the first wave front). The lagging sound does also affect the perceived location; however, its effect is mostly suppressed by the first-arriving sound.
The Haas effect was described in 1949 by Helmut Haas in his Ph.D. thesis.[1] The term "Haas effect" is often loosely taken to include the precedence effect which underlies it.