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’ve noticed that the children of other nations always seem precocious. That’s because the strange manners of their elders have caught our attention most and the children echo those manners enough to seem like their parents.”
—F. Scott Fitzgerald (1896–1940)