منابع مشابه
INTERNET telephony or Internet TELEPHONY?
Internet telephony (or VoIP) has been viewed in two different ways. First, some hold that it is largely similar to earlier architectural changes in the PSTN, continuing the transition from analog to circuit-switched digital and now to packet-switched transmission. Others believe that Internet telephony is primarily another Internet application that happens to interconnect with a “legacy” networ...
متن کاملFrom Narrowband Telephony to Wideband Telephony
The restricted audio quality of today’s telephone networks is mainly due to the narrowband (NB) limitation to the frequency range from about 300 Hz to 3.4 kHz. Meanwhile, codecs for wideband (WB) telephony (50 Hz to 7 kHz) exist with significantly improved speech intelligibility and naturalness. However, the broad introduction of wideband speech coding will require strong efforts of both networ...
متن کاملRTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated...
متن کاملRTP Payload for DTMF Digits, Telephony Tones and Telephony Signals
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as refer...
متن کاملRTP Payload for DTMF Digits , Telephony Tones and Telephony Signals
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as refer...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1907
ISSN: 0036-8733
DOI: 10.1038/scientificamerican04271907-26175asupp