By Olivier Hersent
In 1999-2000, VoIP (Voice-over-IP) telephony used to be essentially the most profitable buzzwords of the telecom bubble period. notwithstanding, in 2001-2003, VoIP confronted a really difficult truth payment. Now, brands and repair companies are drawing on what they've got learnt from earlier event so that it will arrange to take part within the subsequent significant problem confronted by way of the telecommunications industry.This booklet deals a entire evaluation of the problems to resolve so as to installation worldwide revenue-generating powerful "multimedia" companies. Drawing on huge study and useful deployment event in VoIP, the authors supply crucial suggestion for these trying to layout and enforce a post-bubble VoIP network.Beyond VoIP Protocols: realizing Voice know-how and Networking suggestions for IP Telephony Introduces the fundamentals of speech coding and voice qualityDemonstrates how caliber of carrier will be outfitted into the community and bargains with dimensioning points, e.g. multipoint communications and the way to version name seizures.Explores the potential for multicast to show an IP spine into an optimized broadcast mediumIncludes amply illustrated, cutting-edge sensible recommendation for formulating a whole deployment strategyA spouse quantity to "IP Telephony: Deploying VoIP Protocols", this booklet takes the reader a level deeper into the way to arrange the community and take advantage of VoIP know-how to its complete capability.
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Extra resources for Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony
Frequency 14 BEYOND VoIP PROTOCOLS is for the bandwidth of the original analog signal to be strictly limited to the frequency band [0, Fs /2]. 5 shows an ideal situation and a frequency-wrapping situation; in the case of frequency wrapping, the recovered signal is spoiled by frequency aliasing. The spectrum of real physical signals (such as the electrical signal generated by a microphone) do not have a well-defined frequency limit. Therefore, before the sampling process, it is necessary to cut off any frequency component beyond the Nyquist frequency by using an ‘anti-aliasing’ analog filter.
An audio signal restricted to this band remains very clear and understandable, but does alter the natural sound of the speaker voice. This bandwidth is not sufficient to provide good music quality. • The audio wide-band from 30 Hz to 7,000 Hz. Speech is reproduced with an excellent quality and fidelity, but this is still not good enough for music. • The hi-fi band from 20 Hz to 15 kHz. Excellent quality for both voice and music. ) for spatialized sound reproduction. • The CD quality band from 20 Hz to 20 kHz.
The two laws rely on the same approximation of a logarithmic curve: using segments with a slope increasing by a factor of 2, but the exact length of segments and slopes differ between the A-law and the µ-law. This results in subtle differences between the A-law and the µ-law: the A-law provides a greater dynamic range than the µ-law, but the µ-law provides a slightly better SNR than the A-law for low-level signals (in practice, the least significant bit is often stolen for signaling purposes in µ-law countries, which degrades the theoretical SNR).
Beyond VoIP Protocols: Understanding Voice Technology and Networking Techniques for IP Telephony by Olivier Hersent