Improvement to Echo Cancellers
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
In a digital voice transmission system, as represented in the figure, some of the remote speech to be provided to the user at the local speech terminal is, in fact, fed back to the originator as an echo. Echoes are due to mismatching in the hybrid transformer (H) load impedance. They are generally very troublesome and as much as possible should be removed.