US 2003/0118177 A1 · Method and system for implementing a reduced complexity dual rate echo canceller

Abstract

A dual rate echo canceller for simultaneous support of multiple annexes is provided. The present invention provides an efficient Reduced Complexity Dual Rate Echo Chancellor (RCDR-EC) architecture for ADSL CPE for simultaneous support of a plurality of annexes, such as Annex A and Annex B of G.992.1. In addition, low complexity LMS update rules are proposed for adaptive training RCDR-EC. In addition, RCDR-EC of the present invention may operate at the transmit rate, the lower of the two rates, thereby requiring less computation per data sample. The present invention provides an echo canceller structure for full rate ADSL CPE. Another aspect of the present invention is directed to designing the echo canceller flexible enough to simultaneously support, at least, Annex A and Annex B of G.992.1. Another aspect of the present invention is further directed to obtaining an efficient rate matching echo canceller implementation for full rate ADSL CPE as well as other applications.

Claims34

Dependent claims

A dual rate echo canceller for simultaneous support of a plurality of annexes, the echo canceller comprising:

an annex selector for selecting at least one of a plurality of annexes;
an echo cancellation filter having an input adapted to receive a transmit signal, the echo cancellation filter being adapted to generate an output signal comprising a signal component representative of an echo signal associated with the transmit signal, wherein the echo cancellation filter operates at a transmit rate;
and
an output up sampling block having an input adapted to receive the output signal, the output up sampling block being adapted to generate an up-sampled signal by a factor associated with a selected annex.

1 more element

Dependencies are inferred from the claim text.

Method and system for implementing a reduced complexity dual rate echo canceller

Life of this patent

Method and system for implementing a reduced complexity dual rate echo canceller

Life of this patent

Abstract

Claims34