Transmission system comprising a sub-band echo canceller which includes a sub-band coding arrangement
US5500880A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1994 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Dec 16, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/21
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Transmission system comprising a sub-band echo canceller which includes a sub-band coding arrangement. The invention relates to a transmission system comprising a sub-band echo canceller which includes a canceller that can be switched between a receive path (r) and a send path (s). To reduce the computational complexity as well as the signal delays also with sub-band coding or sub-band decoding, the sub-band coding arrangement comprises a synthesis filter bank and an analysis filter bank which are provided for sub-band coding and also for sub-band echo cancellation. Advantageous applications for the echo canceller are subscriber terminal units, for example, hands-free facilities for car telephones, videophones or video conference units which have an echo path formed by at least one microphone and at least one loudspeaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.