Method and device for computing echo-cancellation coefficients using FFT
US6990083B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 2000 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Mar 12, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method of calculating echo-canceling (EC) coefficients to be used by an echo cancellation filter in a communication modem, the communication modem having a Fast Fourier Transform (FFT) serial to parallel interface, the method including the steps of transmitting a first signal including a wide-band cyclic sequence, generating an echo signal based on the first signal and a plurality of EC coefficients, receiving a second signal including a wide-band cyclic sequence, subtracting the echo-canceled signal from the second signal to produce an echo-cancelled signal, transforming the echo-cancelled signal via the FFT serial to parallel interface to produce a transformed echo-cancelled signal, and calculating the plurality of EC coefficients based on the transformed echo-cancelled signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.