Galloway, William J. Bolt, Beranek and Newman, Inc., Canoga Park, California.
Last reviewed:January 2020
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A sound wave which has been reflected or otherwise returned with sufficient magnitude and time delay to be perceived in some manner as a sound wave distinct from that directly transmitted. Multiple echo describes a succession of separately indistinguishable echoes arising from a single source. When the reflected waves occur in rapid succession, the phenomenon is often termed a flutter echo.
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