A Generic Algorithm for Mid-call Audio Codec Switching

Assem, Haytham and Adely, 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: IFIP/IEEE International Symposium on Integrated Network Management (IM 2013), 2013. IEEE, pp. 1276-1281. ISBN 9781467352291

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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
Keywords: VoIP; Audio Codecs; Codec Switching; E-model;
Academic Unit: Faculty of Science and Engineering > Research Institutes > Hamilton Institute
Faculty of Science and Engineering > Mathematics and Statistics
Item ID: 6239
Depositing User: Dr. David Malone
Date Deposited: 07 Jul 2015 15:40
Publisher: IEEE
Refereed: Yes

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