An adaptive playout algorithm with delay spike detection for real-time VoIP

Shallwani, A.; Kabal, P.

doi:10.1109/ccece.2003.1226063

Cited by 21 publications

(20 citation statements)

References 54 publications

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“…Shallwani and Kabal [10] proposed a method based on the AR model. This method predicts the delay of voice packets using the AR model and controls the length of the jitter buffer.…”

Section: Related Workmentioning

confidence: 99%

“…However, Over-TheTop (OTT) service providers cannot control mobile networks. Therefore, adaptive jitter buffer control technologies have been researched to maintain the quality of VoIP services [10], [11], [12], [13]. These methods aim to maximize the quality of voice communications under the conditions in which delay spikes occur frequently.…”

Section: Introductionmentioning

confidence: 99%

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Study on mechanism and reduction approaches of delay spikes occurrence on mobile networks

Nihei

Satoda

2015

2015 13th International Conference on Telecommunications (ConTEL)

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Since smartphones have spread and the transmission rate of mobile networks has accelerated, a lot of VoIP services are provided on mobile networks. Voice quality degradation due to delay spikes (i.e. sudden large increases in the packet delay) is the key issue for VoIP on mobile networks. To resolve this issue, adaptive jitter buffer control methods have been proposed to deal with delay spikes. These methods control the length of the jitter buffer in order to reduce voice quality degradation due to delay spikes. For further improving the quality of voice communication, it is effective to reduce the number of delay spikes. This paper analyzes the mechanism of delay spikes occurrence and proposes delay spike reduction approaches by controlling size and interval of voice packets on the basis of radio quality. Simulation results on the network simulator (ns-3) show the proposed approaches reduce the number of delay spikes by more than 50%.

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“…Shallwani and Kabal [10] proposed a method based on the AR model. This method predicts the delay of voice packets using the AR model and controls the length of the jitter buffer.…”

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on mechanism and reduction approaches of delay spikes occurrence on mobile networks

Nihei

Satoda

2015

2015 13th International Conference on Telecommunications (ConTEL)

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“…WSOLA is most widely used in the Adaptive playout buffer algorithm [6] for scaling of voice packets. Timescale modification techniques gives better results than the simple receiver based or sender based techniques.…”

Section: Waveform Similarity Overlap Addmentioning

confidence: 99%

Speech Packet Concealment Techniques Based on Time-Scale Modification for VoIP

Bhute

Shrawankar

2008

2008 International Conference on Computer Science and Information Technology

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With the availability of large bandwidth and high data rates the transmission of data, voice and video over the Internet is gaining popularity. Voice-over-IP (VoIP) uses packetized transmission of speech over the Internet (IP network).However, at the receiving end; packets are missing due to network delay, network congestion (jitter) and network errors. This packet loss degrades the quality of speech at the receiving end of a voice transmission system in an IP network. Since the voice transmission is a real-time process, the receiver cannot request for retransmission of the missing packets. This causes a need for reconstruction of the lost packet. Concealment algorithms, either transmitter or receiver based, are used to replace these lost packets. The goal of this paper is to review the different PLC algorithm on the receiver side.

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“…This algorithm contains a spike detection mechanism. When a spike is detected, [23] the algorithm changes in SPIKE mode, the delay estimate tracks the delays closely. If it is not in the SPIKE mode, then the concept of this algorithm is same as the first algorithm, but except the value of α is set to 0.875.The Spike-Det Algorithm as shown below.…”

Section: 3 Spike Detectionmentioning

confidence: 99%

Perceptual Evaluation Of Playout Buffer Algorithm For Enhancing Perceived Quality Of Voice Transmission Over Ip Network

Perwej¹

2012

IJMNCT

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Voice over Internet Protocol (VoIP) is a technology that allows you to make voice calls using a broadband Internet connection instead of a regular (or analog) phone line. Voice over Internet Protocol (VoIP) has led human speech to a new level, where conversation across continents can be much cheaper & faster. However, as IP networks are not designed for real-time applications, the network impairments such as packet loss, jitter and delay have a severe impact on speech quality. The playout buffer at the receiver side is used to compensate jitter at a trade-off of delay and loss. We found the characteristics of delay and loss are dependent on IP network and sudden variable delay (spike) often performs both regular and irregular characteristics. Different playout buffer algorithms can have different impacts on the achievement speech quality. It is important to design a playout buffer algorithm which can help achieve an optimum speech quality. In this paper, we investigate to the understanding how network impairments and existing adaptive buffer algorithms affect the speech quality and further to design a modified buffer algorithm to obtain an optimized voice quality. We conduct experiments to existing algorithms and compared their performance under different network conditions with high and low network delay variations. Preliminary results show that the new algorithm can enhance the perceived speech quality in most network conditions and it is more efficient and suitable for real buffer mechanism. KEYWORDSVoice over IP (VoIP), IP telephony, playout buffer adaptation, Jitter buffer, Delay, Quality of Service (QoS)

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An adaptive playout algorithm with delay spike detection for real-time VoIP

Cited by 21 publications

References 54 publications

Study on mechanism and reduction approaches of delay spikes occurrence on mobile networks

Study on mechanism and reduction approaches of delay spikes occurrence on mobile networks

Speech Packet Concealment Techniques Based on Time-Scale Modification for VoIP

Perceptual Evaluation Of Playout Buffer Algorithm For Enhancing Perceived Quality Of Voice Transmission Over Ip Network

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