A generic algorithm for mid-call audio codec switching

Assem, Haytham and Adel, Mohamed and Jennings, Brendan and Malone, David and Dunne, Jonathan and O'Sullivan, Pat (2013) A generic algorithm for mid-call audio codec switching. In: Proceedings of the 2013 IFIP/IEEE International Symposium on Integrated Network Management, IM 2013 :. Proceedings of the 2013 IFIP/IEEE International Symposium on Integrated Network Management, IM 2013 . UNSPECIFIED, BEL, pp. 1276-1281. ISBN 9783901882517

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Abstract

We present and evaluate an algorithm that performs in-call selection of the most appropriate audio codec given prevailing conditions on the network path between the endpoints of a voice call. We have studied the behaviour of different codecs under varying network conditions, in doing so deriving the impairment factors for non-ITU-T codecs so that the E-model can be used to assess voice call quality for them. Moreover, we have studied the drawbacks of codec switching from the end user perception point of view; our switching algorithm seeks to minimise this impact. We have tested our algorithm on different packages that contain a selection of the most commonly used codecs: G.711, SILK, ILBC, GSM and SPEEX. Our results show that in many typical network scenarios, our switching codecs mid-call algorithm results in better Quality of Experience (QoE) than would have been achieved had the initial codec been used throughout the call.

Item Type:	Book Section
Uncontrolled Keywords:	/dk/atira/pure/subjectarea/asjc/1700/1705
Departments or Groups:
Depositing User:	Admin SSL
Date Deposited:	19 Oct 2022 23:14
Last Modified:	30 Jun 2023 00:50
URI:	http://repository-testing.wit.ie/id/eprint/4798

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