Patent · US Expired

Fast converging affine projection based echo canceller for sparse multi-path channels

US6909782B2 · kind B2 · utility

2Cited by
4References
36Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 6, 2001
Grant dateJun 21, 2005
Priority date—
Expiry dateMay 3, 2023

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG10L2021/02082
  • WIPO fieldTelecommunications
  • WIPO sectorElectrical engineering

Abstract

A first adaptive filter having a first filter length estimates a channel weight vector of an echo channel using an affine projection (AP) update. The echo channel receives a send input sequence and a receive input sequence. The echo channel has a plurality of sparse multi-path channels. A delay estimator determines a plurality of delays in the echo channel using the estimated channel weight vector. A second adaptive filter estimates a plurality of short weight vectors using the AP update and the plurality of delays. The short weight vectors correspond to the sparse multi-path channels. Each of the short weight vectors has a short filter length.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.