Packet based echo cancellation for voice over Internet protocol

Author

Periakarruppan, Ganesan ; Abdul Rashid, Hairul Azhar B

Author_Institution

Fac. of Eng., Multimedia Univ., Cyberjaya, Malaysia

Volume

1

fYear

2005

fDate

16-18 Nov. 2005

Abstract

In today´s modern telephony network, VoIP is fast emerging as one of the main communication techniques. However, the performance and the quality of VoIP is affected by echo. In this paper, a packet based echo canceller (PBEC) is introduced, as a solution to cancel echo in the VoIP network. PBEC can replace the current echo cancellers, which are located in the public switched telephony network (PSTN) central switches. The operating principle of the PBEC is explained and its advantages highlighted. The performance of the PBEC operating using different speech codecs is also studied. Using the PBEC, a maximum ERLE of 37.39 dB has been achieved when used with the pulse code modulation (PCM) based speech codec. From the simulation results, it can be also shown that the performance of the adaptive differential pulse code modulation (ADPCM) clearly matches the performance of the PCM based speech codec.

Keywords

Internet telephony; differential pulse code modulation; echo suppression; speech codecs; ERLE; VoIP network; adaptive differential pulse code modulation; packet based echo cancellation; public switched telephony network central switches; speech codec; telephony network; voice over Internet protocol; Circuits; Costs; Echo cancellers; Internet telephony; Modulation coding; Phase change materials; Power generation economics; Pulse modulation; Speech codecs; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Networks, 2005. Jointly held with the 2005 IEEE 7th Malaysia International Conference on Communication., 2005 13th IEEE International Conference on

ISSN

1531-2216

Print_ISBN

1-4244-0000-7

Type

conf

DOI

10.1109/ICON.2005.1635509

Filename

1635509