carrier-free method
81Amplitude modulation — Passband modulation v · d · e Analog modulation AM · …
82Telephone exchange — A telephone operator manually connecting calls with cord pairs at a telephone switchboard. In the field of telecommunications, a telephone exchange or telephone switch is a system of electronic components that connects telephone calls. A central… …
83Caller ID — (caller identification, CID), also called calling line identification (CLID) or calling number identification (CNID) or Calling Line Identification Presentation (CLIP), is a telephone service, available in analog and digital phone systems and… …
84Deep-level transient spectroscopy — (DLTS) is an experimental tool for studying electrically active defects (known as charge carrier traps) in semiconductors. DLTS establishes fundamental defect parameters and measures their concentration in the material. Some of the parameters are …
85postal system — System that allows persons to send letters, parcels, or packages to addressees in the same country or abroad. Postal systems are usually government run and paid for by a combination of user charges and government subsidies. There are early… …
86United States Postal Service — This article is about the government agency. For individual post offices, see U.S. Post Office (disambiguation). For the cycling team, see Discovery Channel Pro Cycling Team. USPS redirects here. For the non profit boating safety and education… …
87ITunes — Infobox Software name = iTunes caption = iTunes 8.0 running on Mac OS X 10.5 Leopard in Grid View. developer = Apple Inc. operating system = Mac OS X v10.4.9 or later, Windows XP Service Pack 2 or later, and Vista [cite… …
88Christianity — /kris chee an i tee/, n., pl. Christianities. 1. the Christian religion, including the Catholic, Protestant, and Eastern Orthodox churches. 2. Christian beliefs or practices; Christian quality or character: Christianity mixed with pagan elements; …
89international relations — a branch of political science dealing with the relations between nations. [1970 75] * * * Study of the relations of states with each other and with international organizations and certain subnational entities (e.g., bureaucracies and political… …
90Dates of 2005 — ▪ 2006 January This is a unique case of a people under occupation being asked to hold free and fair elections when they themselves are not free.… It s an important internal test, and I think it s a turning point. Palestinian legislator Hanan… …
