Effectiveness of adaptive codec switching VoIP application over heterogeneous networks

Ng, See Leng; Hoh, S.; Singh, Davinder

doi:10.1109/mtas.2005.207214

Cited by 7 publications

(1 citation statement)

References 9 publications

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“…+ (7) where En i,k is the predicted network delay value for the i th packet, w i,k is the T×1 vector of adaptive filter coefficients of the Enhanced normalized least mean squares (NLMS) algorithm [23], ( ) T is the vector transpose, and n i,k is T×1 vector containing the past T network delays (up to and including the delay for packet (i − 1)). The filter tap weights w i,k are then updated after each packet using the Enhanced NLMS algorithm:…”

Section: Playout-time Computationmentioning

confidence: 99%

Enhanced Timing Recovery Using Active Jitter Estimation for Voice-Over IP Networks

Kim¹

2012

KSII TIIS

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Improving the quality of service in IP networks is a major challenge for real-time voice communications. In particular, packet arrival-delay variation, so-called "jitter," is one of the main factors that degrade the quality of voice in mobile devices with the voice-over Internet protocol (VoIP). To resolve this issue, a receiver-based enhanced timing recovery algorithm combined with active jitter estimation is proposed. The proposed algorithm copes with the effect of transmission jitter by expanding or compressing each packet according to the predicted network delay and variations. Additionally, the active network jitter estimation incorporates rapid detection of delay spikes and reacts to changes in network conditions. Extensive simulations have shown that the proposed algorithm delivers high voice quality by pursuing an optimal trade-off between average buffering delay and packet loss rate.

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Section: Playout-time Computationmentioning

confidence: 99%