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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 ...
1 Hedy Lamarr. 1 comment. 2 Combining sections. 3 POV? 2 comments. 4 SIGSALY. 1 comment. 5 Modulation? 2 comments. 6 Practical how-to article. 1 comment. 7 Spread ...
This installation was at the Gallery from 12 March to 7 May 2006. It was installed in December 2007 at the Wolfsonian Museum in Miami Beach, FL, and again at 3-Legged Dog in New York City, where it was used to accompany a play about Antheil and Hedy Lamarr, and their invention of spread-spectrum technology, called Frequency Hopping. [18]
In the US, FCC part 15 on unlicensed spread spectrum systems in the 902–928 MHz and 2.4 GHz bands permits more power than is allowed for non-spread-spectrum systems. Both FHSS and direct-sequence spread-spectrum (DSSS) systems can transmit at 1 watt, a thousandfold increase from the 1 milliwatt limit on non-spread-spectrum systems.
A silent speech interface is a device that allows speech communication without using the sound made when people vocalize their speech sounds. It works by the computer identifying the phonemes that an individual pronounces from nonauditory sources of information about their speech movements .
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Direct-sequence spread-spectrum transmissions multiply the symbol sequence being transmitted with a spreading sequence that has a higher rate than the original message rate. Usually, sequences are chosen such that the resulting spectrum is spectrally white. Knowledge of the same sequence is used to reconstruct the original data at the receiving ...
Hedy Lamarr (born Hedwig Kiesler, 1914–2000), actress, invented early form of spread spectrum communications technology, a key to modern wireless communication; Marc Lawrence (born Max Goldsmith, 1910–2005), character actor [497] Zero Mostel (born Samuel Mostel, 1915–1977), stage and film actor [498]