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Proceedings Paper

Novel adaptive playout algorithm for voice over IP applications and performance over WANs
Author(s): Mustafa Hakan Hintoglu; Faruk Ruyal Ergul
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Paper Abstract

Special purpose hardware and application software have been developed to implement and test Voice over IP protocols. The hardware has interface units to which ISDN telephone sets can be connected. It has Ethernet and RS-232 interfaces for connections to LANs and controlling PCs. The software has modules which are specific to telephone operations and simulation activities. The simulator acts as a WAN environment, generating delays in delivering speech packets according to delay distribution specified. By using WAN simulator, different algorithms can be tested and their performances can be compared. The novel algorithm developed correlates silence periods with received voice packets and delays play out until confidence is established that a significant phrase or sentence is stored in the playout buffer. The performance of this approach has been found to be either superior or comparable to performances of existing algorithms tested. This new algorithm has the advantage that at least a complete phrase or sentence is played out, thereby increasing the intelligibility considerably. The penalty of having larger delays compared to published algorithms operating under bursty traffic conditions is compensated by higher quality of service offered. In the paper, details of developed system and obtained test results will be presented.

Paper Details

Date Published: 25 July 2001
PDF: 11 pages
Proc. SPIE 4522, Voice Over IP (VoIP) Technology, (25 July 2001); doi: 10.1117/12.434294
Show Author Affiliations
Mustafa Hakan Hintoglu, Karel A.S. (Turkey)
Faruk Ruyal Ergul, Middle East Technical Univ. (Turkey)

Published in SPIE Proceedings Vol. 4522:
Voice Over IP (VoIP) Technology
Petros Mouchtaris, Editor(s)

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