Wireless spread spectrum video communications device
First Claim
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1. A wireless spread spectrum video communications apparatus that comprises:
- a transmitter, and one or a plurality of receivers;
said transmitter includes a video input means, a pseudo-random code generator means, and a radio frequency transmitter means, a video signal on said video input means and the output of said pseudo-random code generator means causing modulation of said radio frequency transmitter means;
the modulation of said radio frequency transmitter means by said pseudo-random generator means provides spectral spreading of the output of the radio frequency transmitter means to reduce the power per bandwidth spectral density;
said one or more receivers capable of receiving radio frequency transmissions from said transmitter;
and said one or a plurality of receivers capable of each providing a video output signal, either baseband or modulating a carrier frequency, that is not tangibly degraded by the modulation resulting from said pseudo-random code generator on said radio frequency transmitter means.
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Abstract
A direct sequence spread spectrum approach to wireless video transmissions is utilized. This approach provides a lowered spectral power density and also can provide scrambling of the video signal. By providing lower spectral power density the transmitter portion of the invention can operate at higher radio frequency output power levels while remaining in compliance with government regulation for unlicensed use. For example, in the United States, the Federal Communications Commission Part 15 rules allow for higher total conducted output power as long as the spectral power density is limited to +8 dBm for any 3 KHz bandwidth within the allocated band.
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Citations
10 Claims
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1. A wireless spread spectrum video communications apparatus that comprises:
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a transmitter, and one or a plurality of receivers;
said transmitter includes a video input means, a pseudo-random code generator means, and a radio frequency transmitter means, a video signal on said video input means and the output of said pseudo-random code generator means causing modulation of said radio frequency transmitter means;
the modulation of said radio frequency transmitter means by said pseudo-random generator means provides spectral spreading of the output of the radio frequency transmitter means to reduce the power per bandwidth spectral density;
said one or more receivers capable of receiving radio frequency transmissions from said transmitter;
and said one or a plurality of receivers capable of each providing a video output signal, either baseband or modulating a carrier frequency, that is not tangibly degraded by the modulation resulting from said pseudo-random code generator on said radio frequency transmitter means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification