Echo (phenomenon)
In audio signal processing and acoustics, an echo (plural echoes) is a reflection of sound, arriving at the listener some time after the direct sound. Typical examples are the echo produced by the bottom of a well, by a building, or by the walls of an enclosed room and an empty room. A true echo is a single reflection of the sound source. The time delay is the extra distance divided by the speed of sound. The word echo derives from the Greek ἠχώ (ēchō), itself from ἦχος (ēchos), "sound".
Read more about Echo (phenomenon): Acoustic Phenomenon, In Computing, In Music, Mythology, Duck's Quack, Famous Echoes
Famous quotes containing the word echo:
“I cease my song for thee,
From my gaze on thee in the west, fronting the west, communing with thee,
O comrade lustrous with silver face in the night.
Yet each to keep and all, retrievements out of the night,
The song, the wondrous chant of the grey-brown bird,
And the tallying chant, the echo aroused in my soul,
With the lustrous and drooping star with the countenance full of woe,”
—Walt Whitman (1819–1892)