Adaptive echo suppressor
Abstract
Echo is known to be induced by impedance mismatching in telecommunication networks. A time multiplexed digital adaptive echo suppressor (AES) is proposed which has an echo signal level estimating function and detects the break-in by comparison between send-in signal and the estimated echo signal level. The discussion covers the structure and operation of the main components of the proposed system: signal level measuring circuit, echo level estimation part, and speech detector. An experimental 128 channel digital AES is implemented, and it is shown that such a system is realizable fairly compactly and inexpensively by the use of time multiplex technique and ICs including some LSIs. The system proves suitable for providing a large reduction in speech clipping both objectively and subjectively.
- Publication:
-
3rd International Conference on Digital Satellite Communications
- Pub Date:
- 1975
- Bibcode:
- 1975dsc..conf..219A
- Keywords:
-
- Adaptive Control;
- Digital Systems;
- Echo Suppressors;
- Satellite Transmission;
- Time Division Multiplexing;
- Voice Communication;
- Communication Satellites;
- Integrated Circuits;
- Multichannel Communication;
- Signal Reception;
- Signal Reflection;
- Electronics and Electrical Engineering