Broadcast Engineering - April 2008 - (Page 42)

FEATURE QOE FOR IPTV END USERS Keep an eye on QoE Although a properly implemented QoS system will help to ensure that IPTV streams travel from source server to the destination IPTV consumer device in an unhindered manner, service providers still need to moni- and compares it with a reference signal obtained from source video content. The signal size varies between measurement equipment but is typically uncompressed and quite large. This measurement will determine distortion levels and degradation that IPTV consumer device decoder IPTV consumer device in real time but not from the source. Zero reference systems are particularly suited to measuring real-time IPTV streams because they analyze fewer factors compared with full reference systems. Partial reference Similar to the approach used by full reference systems, partial reference measurement equipment is designed to take a sample at the source and also at the destination IPTV consumer device, compare the signals and output a metric. Partial reference systems require less computational complexities when compared with full reference systems and use a smaller reference IPTV stream sample when comparing both signals. Conclusion An increased understanding by network administrators of QoE is critical to ensuring that an end-toend IPTV system operates effectively. Only when this occurs will companies start to truly unlock the potential of IPTV technologies. BE Gerard O’Driscoll is an international telecommunications expert, entrepreneur and author of “Next Generation IPTV Services and Technologies. ” Encoder Trusted reference video source Next-generation networking IP distribution network IPTV video analysis tool Video output with distortion and impairments in level of quality Figure 3. Full reference-based QoE measurement system tor how end users perceive the quality of the IPTV experience. A set of QoE measurement models are typically used to measure the satisfaction levels of IPTV end users. There are three primary models used by IPTV quality measurement systems to identify the presence of IPTV stream impairments, namely full reference, zero reference and partial reference. Full reference This system makes a copy of the stream at the IPTV consumer device occurred during the encoding and transfer of the original video content across the network. Figure 3 illustrates a basic reference topology used to compare the original signal with a signal post transmission across the IP distribution network. Zero reference There are also systems available that do not require a reference video signal to score the video quality of an IPTV stream. Instead, a sample compressed signal is obtained from the 50 years of innovation The mission of NTP is to meet mission critical applications within Radio and TV Broadcasters, by being forward looking and innovative in the product design. Full redundancy is available for NTP routers and the Router Control Systems. Celebrating its 50th anniversary in 2008, NTP has a large customer base and a proven track record delivering reliable equipment for the worldwide television and radio broadcast market. NTP produces high-quality digital audio routing systems with a wide range of signal processing functions for the mid to large-scale segment. NTP offers a large selection of DSP functions. NTP’s Router Control Systems, VMC, Visual Matrix Control, controls NTP’s router, third party audio and video routers, interfaces to control panels, audio mixers, touch sensitive screens, automation systems, UMD control, GPI systems, modular equipment, multiviewer and any controllable (TCPIP or serial) equipment. Poppelgårdvej 7 · DK-2860 Søborg · Denmark · www.ntp.dk · ntp@ntp.dk · Phone +45-44 53 11 88 AUDIO ROUTING AND ROUTER CONTROL SYSTEMS 42 broadcastengineeringworld.com | April 2008 http://broadcastengineeringworld.com

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Broadcast Engineering - April 2008 Contents Editorial HD Newsrooms Wavelet Compression Mobile TV Audio Processing for HDTV, Part 1 QoE for IPTV End Users NAB Update Asset Management Advertisers Index

Broadcast Engineering - April 2008

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