Adaptive playout scheduling and loss concealment for voice communication over ip networks

Liang, Y.J.; Färber, N.; Girod, Bernd

doi:10.1109/tmm.2003.819095

Cited by 119 publications

(107 citation statements)

References 20 publications

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“…If the estimated network delay has increased during the last talkspurt, the silence period is extended in order to supply with adequate playout time the next talkspurt, and vice versa. Packet-based adaptation is also possible, through time scaling modifications on voice packets [11,13]. In this case, expanding a packet results to higher playout delay in order to compensate for an increase in network delay.…”

Section: Playout Algorithmsmentioning

confidence: 99%

“…A variety of loss concealment techniques have been proposed in order to recover the lost signal segments [6,13]. The simplest concealment method is merely to set all samples of a lost packet to zero and to accept the distortion caused by substituting silence for the missing speech.…”

Section: Playout Algorithmsmentioning

confidence: 99%

“…Waveform substitution introduces negligible algorithmic delay due to the pattern matching method applied to a small search window. Finally, another concealment method is based on a hybrid of time-scale modification and waveform substitution [13]. The concealment of a lost packet is accomplished by expanding the last received packet by a factor of 2.…”

Section: Playout Algorithmsmentioning

confidence: 99%

“…By allowing this tolerance on the decomposition process of the input signal, significant improvement can be observed. At the same time, the WSOLA is computationally and algorithmically more efficient compare to other time-scale modification techniques (e.g., Synchronous OLA or time-domain pitch synchronised OLA) [13,23].…”

Section: Figmentioning

confidence: 99%

“…This approach reacts slower to a change in the network conditions. Alternatively, time-scale modification techniques have been proposed to adjust the playout schedule of each individual packet [11,13]. These schemes are more reactive and robust to delay variations as they adjust the packet duration to the current network conditions in a highly dynamic manner.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Novel Mobility-Aware Playout Algorithm for VoIP Services

Lykourgiotis

Kotsopoulos

Dagiuklas

2017

Wireless Pers Commun

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The latest explosive growth in mobile networks has resulted in an increasing interest in optimisation techniques for mobile services. Resent advances in mobile wireless networks incorporate link-layer intelligence in order to enhance the performance of network and application layers. The Media Independent Handover (MIH) standard provides a framework that can make such link-layer intelligence available to upper layers. In this paper, a novel MIH-enabled playout algorithm for Voice over Internet Protocol applications is presented that aims to compensate for the degradation of voice quality caused by handovers. To that end, link-layer triggers in conjunction with speech time-scale modification techniques are exploited to mitigate the increase in delay and jitter induced by the handover process. Results of subjective listening tests show typical gains of 0.3 on a 5-point scale of the Mean Opinion Score with respect to existing playout scheduling schemes. AQ1

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Section: Playout Algorithmsmentioning

confidence: 99%

Section: Playout Algorithmsmentioning

confidence: 99%

Section: Playout Algorithmsmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Novel Mobility-Aware Playout Algorithm for VoIP Services

Lykourgiotis

Kotsopoulos

Dagiuklas

2017

Wireless Pers Commun

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A perceptual quality model intended for adaptive VoIP applications

Hoene

Karl

Wolisz

2005

Int J Communication

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SUMMARYQuality models predict the perceptual quality of services as they calculate subjective ratings from measured parameters. In this article, we present a new quality model that evaluates Voice over IP (VoIP) telephone calls. In addition to packet loss rate, coding mode and delay, it takes into account the impairments due to changes in the transmission configuration (e.g. switching the coding mode or re-scheduling the playout time). Moreover, this model can be used at run time to control the transmission of such calls. It is also computationally efficient and open source.To demonstrate the potential of our model, we apply it to select the ideal coding and packet rate in bandwidth-limited environments. Furthermore, we decide, based on model predictions, whether to delay the playout of speech frames after delay spikes. Delay spikes often occur after congestion and cause packets to arrive too late. We show a considerable improvement in perceptual speech quality if our model is applied to control VoIP transmissions.

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Transmission power and duration‐aware playout control for packetized media streaming over wireless links

Bambos

2008

Wireless Communications

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We investigate joint transmission power control and playout buffer control for packetized media streaming over wireless links. We propose a novel model formulation that tracks the play/freeze duration and play/freeze switch jitter to control the transmission power and playout rate (1 or 0, i.e., play or rebuffer). The model is especially appropriate for audio/music streaming. The optimal joint control is obtained using a Dynamic Programming approach to balance the average power used against achieved quality of service (QoS), reflecting play/freeze duration and jitter frequency. We also investigate two key special cases, where either only power control or rebuffer control is exercised; we obtain certain useful provable structural properties of these individual side controls. Based on those, we also design a lowcomplexity heuristic control that 'mimics' the obtained structural properties of the optimal ones. Through simulation we see that the developed controls can achieve substantially higher performance over standard benchmark schemes. ‡ This work was conducted when Yan Li was affiliated with the Electrical Engineering Department at Stanford University. This paper is an extended journal version of the conference paper [22]. music on cellular phones, streamed from Internet servers via base stations or wireless access points.A major challenge in supporting high-quality audio/video streaming over wireless links is coping with the stochastically time-varying nature of the wireless channel. Fast fading, slow shadowing, path loss, and overall interference all degrade the signal quality at the receiver. These factors both decrease the average channel throughput and may also induce deep variations on it. For streaming applications, such variations can be very detrimental to the quality of service (QoS), since audio/video is to be

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Adaptive playout scheduling and loss concealment for voice communication over ip networks

Cited by 119 publications

References 20 publications

A Novel Mobility-Aware Playout Algorithm for VoIP Services

A Novel Mobility-Aware Playout Algorithm for VoIP Services

A perceptual quality model intended for adaptive VoIP applications

Transmission power and duration‐aware playout control for packetized media streaming over wireless links

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