Download VoIP Service Quality: Measuring and Evaluating by William Hardy PDF

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By William Hardy

Regardless of the positive factors that make Voice over IP so appealing from the viewpoint of fee and suppleness of cellphone prone, companies will purely undertake it as soon as they have made up our minds even if, and lower than what conditions, the standard of VoIP might be passable to clients. In those pages you can find every thing you must be aware of to respond to these questions, either now and sooner or later as different packet-switched voice prone emerge.

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Extra resources for VoIP Service Quality: Measuring and Evaluating Packet-Switched Voice

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Dropped packet rate 4. Use and efficacy of packet loss concealment The size of the smallest sample of voice encoded in the codec, together with the number of samples per packet will determine how much of the original voice signal is lost when a packet is dropped, thereby defining the potential severity of waveform deformation due to missing packets. The particular method of packet loss concealment, together with the dropped packet rate will then determine the likely perception of the severity of the resultant speech distortion.

20 Part 1: Foundations Service Models As suggested by the discussions in Chaps. 1 and 2, there are many possibilities for creating packet-switched voice services, defined by the packet-switched network in which the service is implemented, the type of codec employed, and the configuration options selected for that codec. There is, in addition, the question of the envisioned use of the voice service, which will shape the expectations of the users of the service. For purposes of illustration, we will consider three variants of service usage that will cover the spectrum of possibilities and serve to highlight the possible differences in user expectations conditioned by those services.

Packet Loss Concealment For codecs that are used in packetswitched voice services, there is a possibility that some frames of the digitized voice signal will not arrive by the time they are needed to regenerate the next voice segment. To create resiliency to the effects of such missing samples on the waveforms reconstructed at the distant end, the encoder may be programmed to fill gaps in sampled data. Typical devices of this kind include simple repetition of the last frame received or generation of an artificial voice segment consonant with immediately previous frames of sampled data.

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