Proceedings ArticleDOI
Voice over IP: improving the quality over wireless LAN by adopting a booster mechanism: an experimental approach
Christian Hoene,Iacopo Carreras,Adam Wolisz +2 more
- Vol. 4522, pp 157-168
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TLDR
In this paper, the authors describe the design and implementation of a speech property based booster that improves the quality of voice over wireless LANs, which uses characteristics of human speech production and features of modern audio codecs to distinguish packets regarding their importance for perceptual quality.Abstract:
The performance of unreliable voice transmission (Voice over IP) over wireless links is measured not by the throughput but by the perceptual speech quality. The speech quality is impaired by packet losses, which are common on wireless links, and by high transmission delays. In this paper, we describe the design and implementation of a novel Speech Property Based Booster that improves the quality of voice over wireless LANs. This booster is in compliance with existing standards and is transparent to other protocols. It uses characteristics of human speech production and features of modern audio codecs to distinguish packets regarding their importance for perceptual quality. Important packets are protected at the link layer by three mechanisms: selective packet loss recovery, redundant transmission and a hybrid solution. These mechanisms have been evaluated using an experimental set-up with commercial wireless LAN equipment. We made measurements of the objective audio quality and analyzed the effects of packet losses, both due to real wireless channels and late packet arrivals. Our experiments show that the booster increases the quality of voice best with the hybrid solution and that the performance of Voice over IP can be improved further.© (2001) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.read more
Citations
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On the Importance of a VoIP Packet
TL;DR: This paper investigates the impact of individual packet loss on the perceptual speech quality in Voice-over-IP systems using three popular coding types and receiver-side loss concealment algorithms and defines an appropriate quality metric.
Patent
Apparatus and method for transparent communication architecture in remote communication
TL;DR: In this article, a machine readable medium and a method are also disclosed for remote communication, where a local communication proxy module may be configured to conceal characteristics of the network from the local communication application module.
Patent
Apparatus and method for accelerating streams through use of transparent proxy architecture
TL;DR: In this article, the authors present a machine-readable medium and a method for remote communication with a transparent proxy module that intercepts a first stream destined to a remote destination and makes a first determination whether to accelerate communication associated with the first stream.
Proceedings ArticleDOI
Selective bit-error checking at the MAC layer for voice over mobile ad hoc networks with IEEE 802.11
TL;DR: Simulation results demonstrate that the network performance and the speech quality are substantially improved by modifying the MAC layer with SEC to suit a particular GSM speech compression standard, the narrow-band adaptive multirate (NB-AMR) coder operating at a rate of 7.95 kbps.
DissertationDOI
Internet Telephony over Wireless Links
TL;DR: Algorithms to enhance the efficiency of packetized, interactive speech communication over wireless networks are presented, which contain relevant innovations and novel algorithms, which have a high potential to influence future research and product development.
References
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Proceedings ArticleDOI
Support of voice services in IEEE 802.11 wireless LANs
TL;DR: This work designs and analyzes a system that uses the polling mode for interactive voice traffic and carries out an error analysis that demonstrates the need for error correction of voice packets.
Journal ArticleDOI
Survey of error recovery techniques for IP-based audio-visual multicast applications
Georg Carle,Ernst W. Biersack +1 more
TL;DR: This survey gives an overview of existing transport-layer error control mechanisms and discusses their suitability for use in IP-based networks, and the impact of IP over ATM on the requirements of error control mechanism is discussed.
Journal ArticleDOI
Protocol boosters
TL;DR: A new methodology for protocol design is described, using incremental construction of the protocol from elements called "protocol boosters" on an as-needed basis, which allow dynamic protocol customization to heterogeneous environments and rapid protocol evolution.
Journal ArticleDOI
Internet telephony: architecture and protocols—an IETF perspective
TL;DR: The upper-layer protocol components that are specific to Internet telephony services: the Real-Time Transport Protocol (RTP) to carry voice and video data, and the Session Initiation Protocol (SIP) for signaling are described.
Proceedings ArticleDOI
Performance of the modified Bark spectral distortion as an objective speech quality measure
TL;DR: Performance of the modified Bark spectral distortion is reported in terms of frame sizes, speech classes, and spectral regions and the high frequency region appears to play an important role in human perception of speech quality.
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