METHOD OF DETERMINING AN ESTIMATED FRAME ENERGY OF A COMMUNICATION

• US 20090094026A1
• Filed: 10/03/2007
• Published: 04/09/2009
• Est. Priority Date: 10/03/2007
• Status: Abandoned Application

• Current Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Original Assignee: Alcatel-Lucent USA, Inc. (Nokia Corporation)
• Inventors: Kim, Doh-Suk, Cao, Binshi, Tarraf, Ahmed A.
• Application Number:
  US11/866,448
• Publication Number:
  US 20090094026A1
• Time in Patent Office: Days
• US Class Current: 704/223
• CPC Class Codes: G10L 25/48 specially adapted for particular use

Abstract

A method of processing a communication includes determining an estimated excitation energy component of a subframe of a coded frame. A filter energy component of the subframe is also estimated. Determining an estimated energy of the subframe is based upon the estimated excitation energy component and the estimated filter energy component. This technique allows for estimating frame energy of a communication such as a voice communication without having to fully decode the communication.

Claims

1. A method of processing a communication, comprising the steps of:

determining an estimated excitation energy component of a subframe of a coded frame;

determining an estimated filter energy component of the subframe; and

determining an estimated energy of the subframe from the estimated excitation energy component and the estimated filter energy component.

2. The method of claim 1, comprising

determining the estimated energy from a product of the estimated excitation energy component and the estimated filter energy component.

3. The method of claim 1, comprising

determining an adaptive contribution to the excitation energy component;

determining a fixed contribution to the excitation energy component; and

determining the estimated excitation energy component based upon the determined adaptive and fixed contributions.

4. The method of claim 3, wherein determining the adaptive contribution comprises

estimating an adaptive contribution of the subframe based upon energy of at least one previous subframe of the coded frame;

and

determining a sum of a plurality of estimated subframe adaptive contributions of the coded frame.

5. The method of claim 4, comprising

estimating the adaptive contribution of the subframe based upon an immediately adjacent previous subframe.

6. The method of claim 5, comprising

determining the adaptive contribution of the subframe to be the same as the immediately adjacent previous subframe.

7. The method of claim 4, comprising

estimating the adaptive contribution of the subframe based upon at least two consecutive previous subframe energies.

8. The method of claim 7, comprising

selecting the at least two consecutive previous subframes based upon a pitch period of the communication.

9. The method of claim 8, wherein the communication is at least partially periodic and the pitch period indicates corresponding portions of the communication at time intervals corresponding to the pitch period and comprising using the pitch period to select the at least two consecutive previous subframes from a previous portion of the communication that corresponds to the subframe.

10. The method of claim 3, comprising

determining an adaptive codebook gain associated with the adaptive contribution using an enhanced variable rate CODEC;

determining a fixed codebook gain associated with the fixed contribution using the enhanced variable rate CODEC; and

determining the estimated excitation energy component based upon the determined adaptive codebook gain and the fixed codebook gain.

11. The method of claim 1, wherein the estimated filter energy component is associated with a linear predictive coding synthesis filter.

12. The method of claim 11, comprising

selecting only an initial portion of a response of the filter for determining the estimated filter energy component.

13. The method of claim 12, comprising

selecting less than ten samples of the response of the filter and

using the selected samples for determining the estimated filter energy component.

14. The method of claim 1, wherein the coded frame is part of a voice communication.

15. The method of claim 1, comprising

determining the estimated frame energy without fully decoding the subframe.