Method of controlling an adaptation of a filter

Abstract

The invention concerns a method of controlling an adaptation of a filter, and a controller and a computer program product to execute this method. The filter is an adaptive finite impulse response (=FIR) filter for modelling an echo path impulse response for echo cancellation in a telecommunications connection between a first terminal providing a near-end signal at a first end of the telecommunications connection and a second terminal providing a far-end signal at another end of the telecommunications connection. In a multi-windowing scheme, a plurality of filter segments and segments of the far-end signal is determined in the time domain. An energy level associated to an individual segment of the far-end signal is compared with an energy level associated to a sample of the near-end signal. In dependence on the result of the comparison of the energy levels, the adaptation of an individual filter segment associated to the individual segment of the far-end signal is enabled or inhibited.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

These as well as further features and advantages of the invention will be better appreciated by reading the following detailed description of presently preferred exemplary embodiments taken in conjunction with accompanying drawings of which:

FIG. 1 is a block diagram of a telephone connection according to an embodiment of the invention.

FIG. 2 is a block diagram of an AEC according to an embodiment of the invention message.

FIG. 3 a is a diagram of an echo path estimate FIR filter according to an embodiment of the invention.

FIG. 3 b is a diagram of a far-end signal according to an embodiment of the invention.

FIG. 3 c is a diagram of a near-end signal according to an embodiment of the invention.

FIG. 4 is a message flow diagram showing processing steps of a controller according to an embodiment of the invention.

Claims

1. A method of controlling an adaptation of a filter, wherein the filter is an adaptive finite impulse response filter for modelling an echo path impulse response for echo cancellation in a telecommunications connection between a first terminal providing a near-end signal at a first end of the telecommunications connection and a second terminal providing a far-end signal at another end of the telecommunications connection,

2. The method of claim 1,

3. The method of claim 1,

4. The method of claim 1,

5. The method of claim 1,

6. The method of claim 1,

7. A controller for controlling an adaptation of a filter, wherein the filter is an adaptive finite impulse response filter for modelling an echo path impulse response for echo cancellation in a telecommunications connection between a first terminal providing a near-end signal at a first end of the telecommunications connection and a second terminal providing a far-end signal at another end of the telecommunications connection,

8. The controller of claim 7,

9. The controller of claim 7,

10. A computer program product for controlling an adaptation of a filter, wherein the filter is an adaptive finite impulse response filter for modelling an echo path impulse response for echo cancellation in a telecommunications connection between a first terminal providing a near-end signal at a first end of the telecommunications connection and a second terminal providing a far-end signal at another end of the telecommunications connection,