AES Vienna 2007: Poster Session P22

P22 - Audio Networking

Tuesday, May 8, 09:00 — 10:30

P22-1 Benefits of Using SIP for Audio Broadcasting Applications—Serge de Jaham, AETA Audio Systems - Le Plessis Robinson, France
The SIP protocol has gained popularity for setting up temporary audio links over IP networks for broadcast applications. This paper briefly describes SIP and discusses its distinctive advantages, especially in comparison with proprietary systems. The main and obvious benefit is standardization, which opens the way to interoperation between different makes of codecs. SIP, as a signaling protocol, readily provides efficient methods for link setups, while preserving ease of use. Now a mature technology in the VoIP field, it is supported by a wide range of network devices and includes provision for specific issues like firewall or NAT traversal. As a result, SIP should be the key to the transition from ISDN to IP networks, while providing at least as flexible operating modes.
Convention Paper 7128 (Purchase now)

P22-2 Managing the Leap from Synchronous to IP for Radio Broadcasters: A Look at Equipment, Network, and Compression Considerations—Simon Daniels, APT - Belfast, Ireland, UK
Increasingly radio broadcasters are looking at making the leap from synchronous networks to IP networks for their distribution and contribution links. The advantages of migrating away from synchronous networks to IP networks are numerous but often tempered by a number of concerns regarding the IP transport mechanism including latency, lost packets, packet size, protocol selection, jitter and algorithm selection. This paper will address concerns such as which IP Protocol is most suitable for real time audio delivery, which algorithm is most suited to IP to reduce the affects of the inherent latency on an IP network, how to protect against packet loss and how to deal with the inherent delay involved in packetizing audio for delivery over an IP network.
Convention Paper 7129 (Purchase now)

P22-3 An XML-Based Approach to Audio Connection Management—Richard Foss, Brad Klinkradt, Rhodes University - Grahamstown, South Africa
An XML-based approach to firewire audio connection management has been developed that allows for the creation of connection management applications using a range of implementation tools. The XML connection management requests flow between a client and server, where the client and server can reside on the same or separate workstations. The server maintains the state of the firewire audio device configuration as well as information about potential users. XML is also used to control user access of devices.
Convention Paper 7130 (Purchase now)

P22-4 Rhythm Based Error Correction Approach for Scalable Audio Streaming Over the Internet—J. C. Cuevas-Martinez, P. Vera-Candeas, N. Ruiz-Reyes, University of Jaén - Linares, Jaén, Spain
Multimedia is nowadays the most important kind of information over the internet due to the impressive growth of the Web and streaming technologies. Although there are faster lines, the amount of potential users can exceed the actual available band width. In that way, scalable audio streaming makes it possible. However, error correction is left in a second level of importance for multimedia, using in some cases TCP, FEC (forward error correction) that are useless in low bit rate coders or even nothing. Therefore, in this paper a rhythm-based error correction approach is presented. This solution can avoid important redundant information, leaving almost all the error processing at the decoder side, without any feedback to the sender.
Convention Paper 7131 (Purchase now)