Staff View: The effect of echo delay on voice quality in VoIP network

The effect of echo delay on voice quality in VoIP network

VoIP (Voice over IP) is a transmission technology that allows telephone calls to be made over an IP-based network. A VoIP system may require sampling, quantizing, coding, compression, packetization, and jitter removal to transmit voice signals. The delays introduced by these processes may result in...

Full description

Saved in:

Bibliographic Details
Main Authors:	Hasbullah, Halabi, Nisar, Kashif, Md Said, Abas
Format:	Conference or Workshop Item
Published:	2009
Subjects:	T Technology (General)
Online Access:	http://eprints.utp.edu.my/4583/1/ACSE2009-VoIP-Halabi.pdf http://www.scopus.com/record/display.url?eid=2-s2.0-74549208010&origin=inward&txGid=pd3CuWGxgkuoWRWsjcTLbba%3a5 http://eprints.utp.edu.my/4583/
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my.utp.eprints.4583
record_format	eprints
spelling	my.utp.eprints.45832017-01-19T08:25:27Z The effect of echo delay on voice quality in VoIP network Hasbullah, Halabi Nisar, Kashif Md Said, Abas T Technology (General) VoIP (Voice over IP) is a transmission technology that allows telephone calls to be made over an IP-based network. A VoIP system may require sampling, quantizing, coding, compression, packetization, and jitter removal to transmit voice signals. The delays introduced by these processes may result in a delay long enough to make the system susceptible to echo problem. Impedance mismatches in analog circuitry and acoustic coupling of the transmit and receive signals at the receiving end is another source of echo. Echo has a direct impact on voice quality, which may determine a user's retention to the VoIP system. Echo cancellation is normally used to remove the echoes, but the removal procedure has itself added another delay value. However, echo not only appeared in long-haul calls but also in short-distance calls of the VoIP system. The objective of this paper is to observe users' retention based on end-to-end delay the users experienced, which is a form of subjective measure on the obtained voice quality. The result can then be used as an input to an objective measure of voice quality of R-Factor. Experimental set up of CRT 3.0, CISCO 3700-series router and analog telephony system were used to investigate the effects. The result confirmed that an end-to-end delay of more than 150 ms would greatly affect the VoIP's voice quality, and thus a user's retention. 2009-03-18 Conference or Workshop Item PeerReviewed application/pdf http://eprints.utp.edu.my/4583/1/ACSE2009-VoIP-Halabi.pdf http://www.scopus.com/record/display.url?eid=2-s2.0-74549208010&origin=inward&txGid=pd3CuWGxgkuoWRWsjcTLbba%3a5 Hasbullah, Halabi and Nisar, Kashif and Md Said, Abas (2009) The effect of echo delay on voice quality in VoIP network. In: IASTED International Conference on Advances in Computer Science and Engineering (ACSE 2009), 16-18 March 2009, Phuket, Thailand. http://eprints.utp.edu.my/4583/
institution	Universiti Teknologi Petronas
building	UTP Resource Centre
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Petronas
content_source	UTP Institutional Repository
url_provider	http://eprints.utp.edu.my/
topic	T Technology (General)
spellingShingle	T Technology (General) Hasbullah, Halabi Nisar, Kashif Md Said, Abas The effect of echo delay on voice quality in VoIP network
description	VoIP (Voice over IP) is a transmission technology that allows telephone calls to be made over an IP-based network. A VoIP system may require sampling, quantizing, coding, compression, packetization, and jitter removal to transmit voice signals. The delays introduced by these processes may result in a delay long enough to make the system susceptible to echo problem. Impedance mismatches in analog circuitry and acoustic coupling of the transmit and receive signals at the receiving end is another source of echo. Echo has a direct impact on voice quality, which may determine a user's retention to the VoIP system. Echo cancellation is normally used to remove the echoes, but the removal procedure has itself added another delay value. However, echo not only appeared in long-haul calls but also in short-distance calls of the VoIP system. The objective of this paper is to observe users' retention based on end-to-end delay the users experienced, which is a form of subjective measure on the obtained voice quality. The result can then be used as an input to an objective measure of voice quality of R-Factor. Experimental set up of CRT 3.0, CISCO 3700-series router and analog telephony system were used to investigate the effects. The result confirmed that an end-to-end delay of more than 150 ms would greatly affect the VoIP's voice quality, and thus a user's retention.
format	Conference or Workshop Item
author	Hasbullah, Halabi Nisar, Kashif Md Said, Abas
author_facet	Hasbullah, Halabi Nisar, Kashif Md Said, Abas
author_sort	Hasbullah, Halabi
title	The effect of echo delay on voice quality in VoIP network
title_short	The effect of echo delay on voice quality in VoIP network
title_full	The effect of echo delay on voice quality in VoIP network
title_fullStr	The effect of echo delay on voice quality in VoIP network
title_full_unstemmed	The effect of echo delay on voice quality in VoIP network
title_sort	effect of echo delay on voice quality in voip network
publishDate	2009
url	http://eprints.utp.edu.my/4583/1/ACSE2009-VoIP-Halabi.pdf http://www.scopus.com/record/display.url?eid=2-s2.0-74549208010&origin=inward&txGid=pd3CuWGxgkuoWRWsjcTLbba%3a5 http://eprints.utp.edu.my/4583/
_version_	1738655354461356032
score	13.211869

The effect of echo delay on voice quality in VoIP network

Similar Items