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Extra info for Broadband in the Last Mile. Access Technologies for Multimedia Communications
Example text
The networks may be static or dynamic, packet-switched or circuit-switched, may support a constant or variable bit rate transmission, and may support some form of quality of service (QoS) or may only provide best effort support. The attributes and operating conditions for media applications and networks can be roughly classified into the following, possibly overlapping, groups: • • • • • • • • Point-to-point, multicast, and broadcast communication Real-time encoding vs. pre-encoded (stored) media Interactive vs.
This is often referred to as VoIP and is also known as Internet telephony. There are a number of motivations for moving from the conventional telephone network to VoIP. One of the main reasons is that IP switching equipment is becoming less expensive than telephone equipment. Another is that there are many benefits for a business to have only one network, instead of two. Therefore, instead of having a circuit-switched telephone network for telephony and a packet-switched IP network for data, strong motivation exists to move to a single network — an IP network — for delivering data and telephony.
800, in which the primary goal is evaluating compression performance, PESQ also attempts to account for network effects such as variable delays, transcoding, channel errors, and concealment, etc. 0. , VoIP settings; however, although PESQ is an important and useful tool, it is not a replacement for conventional subjective tests of perceived speech quality. Objective Tests. It is very valuable to have an objective criterion for measuring the difference between the original and the reconstructed signal, where the measure ideally correlates well with the perceived difference between the two signals.
