Performance analysis of audio codecs over real-time transmission protocol (RTP) for voice services over Internet protocol

Light, Janet; Bhuvaneshwari, A.

doi:10.1109/dnsr.2004.1344751

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…In the opposite side, some others provide lower compression resulting in higher bandwidth consumption and less number of calls [6]. From another point of view, higher compression codecs has lower bit rate which means lower perceived quality.…”

Section: A Codec Rate Adaptationmentioning

confidence: 99%

Adaptive QoS control approaches for VoIP over multi-rate WLANs

Kazemitabar

Said

2012

2012 International Conference on Computer &Amp; Information Science (ICCIS)

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IEEE 802.11 is the most popular standard for WLAN networks. It offers different physical transmission rates. This paper focuses on this multi transmission rate of 802.11 WLANs and its effect on speech quality. In non-adaptive systems, when the physical layer switches from a higher transmission rate to a lower one, different than the one that the VoIP flow needs, the switching may result in congestion, high delay and packet loss, and consequently speech quality degradation. However, there are some algorithms that adapt the transmission parameters according to the channel conditions. In this study we demonstrate how choosing parameter (different codec and packet size) can affect the voice quality, network delay and packet loss. Further, this study presents a comparison between adaptive and non-adaptive methods. The adaptive method has also been evaluated for different congestion level from perceived speech quality point of view.

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Section: A Codec Rate Adaptationmentioning

confidence: 99%

Adaptive QoS control approaches for VoIP over multi-rate WLANs

Kazemitabar

Said

2012

2012 International Conference on Computer &Amp; Information Science (ICCIS)

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“…Many audio coding techniques already exist; however, not all of these are equally suitable for MANET Authors in [2] sion over an IP network using the Mean Opinion Score (MOS) method. The study shows that audio codec G.723.1 and G.729A outperform other codecs in terms of quality.…”

Section: Related Workmentioning

confidence: 99%

Voice transmission over ad hoc network adapting optimum approaches to maximize the performance

Kaosar

Sheltami

2009

Computer Communications

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“…Light [6] compared 7 codecs using the MOS scores of listeners grouped according to their ages. They considered that results from different groups cannot be compared, as many factors affect the subjective rating of the quality of codecs.…”

Section: Related Workmentioning

confidence: 99%

Quality assessment of speech codecs in synchronous e-learning environments

Granda

Quiroga

García

et al. 2011

2011 IEEE International Conference on Multimedia and Expo

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Synchronous e-learning tools always include an audioconference feature so participants in e-learning sessions can communicate orally. Audio quality is critical to avoid misunderstandings and improve user experience. Therefore, it is important to evaluate the audio quality that speech codecs can provide. Few existing assessment works consider the resources consumed (CPU or bitrate) to provide the audio quality, although synchronous e-learning sessions usually involve various participants, making resource consumption an important issue. In this paper, both objective and subjective audio quality measurement methods are used to characterize and estimate the audio quality of twenty speech codecs as a function of the resources consumed during synchronous elearning sessions. Although users' opinions on audio quality are often more pessimistic than the evaluation provided by objective measurements, the correlation between objective and subjective measurements is high for medium-quality codecs. Users perceive lower audio quality for low-quality codecs than indicated by objective measurements, while they are not able to identify high-quality codecs, scoring them similarly to medium-quality codecs.

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Performance analysis of audio codecs over real-time transmission protocol (RTP) for voice services over Internet protocol

Cited by 9 publications

References 11 publications

Adaptive QoS control approaches for VoIP over multi-rate WLANs

Adaptive QoS control approaches for VoIP over multi-rate WLANs

Voice transmission over ad hoc network adapting optimum approaches to maximize the performance

Quality assessment of speech codecs in synchronous e-learning environments

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