heterodyne amplification
21MESURE - Mesures électriques et électroniques — Les mesures électriques et électroniques, grâce à l’apport des semiconducteurs, des méthodes numériques et des systèmes asservis, apparaissent à l’heure actuelle comme une technique clé dans le domaine des mesures en général. L’existence de… …
22superheterodyne — /sooh peuhr het euhr euh duyn /, Radio. adj. 1. denoting, pertaining to, or using a method of processing received radio or video signals in which an incoming modulated wave is changed by the heterodyne process into a lower frequency wave and then …
23Intermediate frequency — In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier frequency is shifted as an intermediate step in transmission or reception. The intermediate frequency is created by mixing the carrier… …
24Technologie de l'Honorverse — Honorverse est le nom semi officiel donné au cadre (histoire, géographie, univers) d une série militaire de science fiction écrite par David Weber et tournant autour de l héroïne Honor Harrington. Sommaire 1 Transport 2 Médical 2.1 prothèses …
25Technologie de l'honorverse — Cet article fait partie de la série Science fiction La SF à l’écran autre A B …
26Technologie de l’Honorverse — Technologie de l Honorverse Cet article fait partie de la série Science fiction La SF à l’écran autre A B …
27Meissner, Alexander — ▪ Austrian engineer born Sept. 14, 1883, Vienna died Jan. 3, 1958, Berlin Austrian engineer whose work in antenna design, amplification, and detection advanced the development of radio telegraphy (telegraph). Meissner studied at the… …
28Edwin Howard Armstrong — Edwin H. Armstrong Developed and advanced the utility of FM technology. Born December 18, 1890(1890 12 18) New York, New York U.S …
29Single-sideband modulation — (SSB) is a refinement of amplitude modulation that more efficiently uses electrical power and bandwidth. It is closely related to vestigial sideband modulation (VSB) (see below).Amplitude modulation produces a modulated output signal that has… …
30Satellite modem — A satellite modem or sat modem is a modem used to establish data transfers using a communications satellite as a relay.There is a wide range of satellite modems from cheap devices for home internet access to expensive multifunctional equipment… …
