A signal processor for, e.g., a telephonic communication system interconnecting a near location and at least one far location includes an echo canceller for suppressing the re-transmission of received signals. The operation of the echo canceller is controlled according to whether the near location is...http://www.google.ca/patents/US5598468?utm_source=gb-gplus-sharePatent US5598468 - Method and apparatus for echo removal in a communication system
