Echo canceler with automatic enablement/disablement on a per-call basis
US5530724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1994 |
| Grant date | Jun 25, 1996 |
| Priority date | — |
| Expiry date | Nov 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Echo cancellation can be enabled to cancel echoes on an outbound transmission path based on original signals on an inbound transmission path. A controller of echo canceler enablement monitors digitized control information contained in call origination messages associated with the establishment of communications. A determination of the type of digitized information to be carried by a two-way communication channel is made. The controller causes the echo canceler to be enabled or disabled on a per-call basis based on the type of digitized information. A stand-alone echo canceler provides automatic enablement/disablement on a per-call basis based on the type of digitized information to be carried on a communication channel as determined by monitoring associated control messages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.