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Hedy Lamarr (/ ˈ h ɛ d i /; born Hedwig Eva Maria Kiesler; November 9, 1914 [a] – January 19, 2000) was an Austrian-born American actress and inventor. After a brief early film career in Czechoslovakia, including the controversial erotic romantic drama Ecstasy (1933), she fled from her first husband, Friedrich Mandl, and secretly moved to Paris.
Frequency-hopping spread spectrum (FHSS) is a method of transmitting radio signals by rapidly changing the carrier frequency among many frequencies occupying a large spectral band. The changes are controlled by a code known to both transmitter and receiver .
Moreover, for a given noise power spectral density (PSD), spread-spectrum systems require the same amount of energy per bit before spreading as narrowband systems and therefore the same amount of power if the bitrate before spreading is the same, but since the signal power is spread over a large bandwidth, the signal PSD is much lower — often ...
In 1941, Antheil and the actress Hedy Lamarr developed a radio guidance system for Allied torpedoes that used a code (stored on a punched paper tape) to synchronize frequency changes, referred to as frequency hopping, between the transmitter and receiver. It is one of the spread spectrum techniques that became widely used in modern ...
Hedy Lamarr (/ ˈ h ɛ d i /; November 9, 1914 – January 19, 2000) was an Austrian-American actress celebrated for her great beauty who was a major contract star of MGM's "Golden Age". Lamarr also co-invented – with composer George Antheil – an early technique for spread spectrum communications and frequency hopping , necessary to ...
1942 – Hedy Lamarr and George Antheil invent frequency-hopping spread spectrum communication technique. 1947 – Full-scale commercial television is first broadcast. 1963 – First geosynchronous communications satellite is launched, 17.5 years after Arthur C. Clarke's article. 1999 – Sirius Satellite Radio is introduced.
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It is sometimes incorrectly claimed that the origin of the resonant reed decoder was in the wartime torpedo-control patent granted to the actress Hedy Lamarr. [2] This patent did precede spread spectrum radio technology, but the frequency-hopping it describes is primarily applied to the radio carrier wave, not the signal coding. A minor aspect ...
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