Hybrid echo is generated by the public switched telephone network (PSTN) through the reflection of electrical energy by a device called a hybrid (hence the term hybrid echo). Most telephone local loops are two-wire circuits while transmission facilities are four-wire circuits. Each hybrid produces echoes in both directions, though the far end echo is usually a greater problem for voiceband.
Read more about this topic: Echo Cancellation
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)