space-and-time quadrature
71405-line television system — The 405 line monochrome analogue television broadcasting system was the first fully electronic television system to be used in regular broadcasting. It was introduced with the BBC Television Service in 1936, suspended for the duration of World… …
72Wavelength-division multiplexing — For the radio station, see DWDM FM. Multiplex techniques Circuit mode (constant bandwidth) TDM · FDM · SDM Polarization multiplexing Spatial m …
73Piphilology — Part of a series of articles on the mathematical constant π …
74Manuel Antonio de Rivas — was a Franciscan friar in Mérida, a Spanish colonial town on the Yucatán Peninsula. Details of his life are sketchy, though there are court documents that prove that in the 1770s he was accused of heresy.[1] He is best known for an account of a… …
75Macintosh 128K/512K technical details — The original Macintosh was a relatively simple machine, now of interest for its simplicity and for the fact that it was the first computer produced by Apple under the name Macintosh. The Macintosh used standard off the shelf components to the… …
76Optical hybrid — A 90° optical hybrid is a six port device that is used for coherent signal demodulation for either homodyne or heterodyne detection. It would mix the incoming signal with the four quadratural states associated with the reference signal in the… …
77Aberration of light — Light from location 1 will appear to be coming from location 2 for a moving telescope due to the finite speed of light, a phenomenon known as the aberration of light. The aberration of light (also referred to as astronomical aberration or stellar …
78Pulse-amplitude modulation — Principle of PAM: (1) original signal, (2) PAM signal, (a) amplitude of signal, (b) time Pulse amplitude modulation, acronym PAM, is a form of signal modulation where the message information is encoded in the amplitude of a series of signal… …
79Color television — Title card for NBC, promoting their broadcast in RCA color . Color television is part of the history of television, the technology of television and practices associated with television s transmission of moving images in color video. In its most… …
80In-band on-channel — (IBOC) is a method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency.By utilizing additional digital subcarriers or sidebands, digital information is piggybacked on a normal AM or FM analog… …
