Wireless real time video system and method of making same
First Claim
1. A wireless video surveillance system, comprising:
- a video camera for generating a base band video signal;
a transmitter for receiving said base band video signal from said video camera, including means for directly modulating a carrier signal at a substantially fixed carrier frequency within an assigned radio frequency transmission band to generate a narrow band frequency modulated transmission signal and a transmitter antenna means having a microstrip patch radiating antenna for transmitting said frequency modulated transmission signal;
a receiver means including a receiving antenna for receiving said frequency modulated tansmission signal radiated from said transmitting antenna means and a demodulator means for deriving said base band video signal from the frequency modulated transmission signal; and
a remote monitoring station having a video monitor or recorder connected to receive said base band video from said receiver means.
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Reexamination
Accused Products
Abstract
A wireless, real time video system provides a low power video transmitter wherein the base band video signal generated by the video camera directly modulates a radio frequency carrier signal to produce a very narrow band transmitter signal that is transmitted through a circularly polarized patch radiating antenna to a receiving antenna at a remote receiver site. The transmitted signal is picked up by the receiver antenna to be passed through a narrow band preselector filter to a low noise amplifier. The amplified signal is then applied to a mixer along with a fixed local oscillator frequency that is demodulated to reconstruct the original base band video signal for use in operating a video monitor or recorder connected by hard wired cable to the receiver unit. Both the transmitter and the receiver employ a phase locked loop and narrow ban filters to confine the transmitted signal and the receiver response within a very narrow frequency band to optimize the transmitter efficiency and prevent generation of and interference from extraneous signals.
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Citations
24 Claims
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1. A wireless video surveillance system, comprising:
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a video camera for generating a base band video signal; a transmitter for receiving said base band video signal from said video camera, including means for directly modulating a carrier signal at a substantially fixed carrier frequency within an assigned radio frequency transmission band to generate a narrow band frequency modulated transmission signal and a transmitter antenna means having a microstrip patch radiating antenna for transmitting said frequency modulated transmission signal; a receiver means including a receiving antenna for receiving said frequency modulated tansmission signal radiated from said transmitting antenna means and a demodulator means for deriving said base band video signal from the frequency modulated transmission signal; and a remote monitoring station having a video monitor or recorder connected to receive said base band video from said receiver means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless video surveillance system comprising:
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a remote video camera for generating a base and video signal; transmitter means connected to said video camera including modulation means for directly modulating a radio frequency carrier signal with said base and video signal to generate a narrow band frequency modulated transmission signal and a transmitter antenna for radiating said transmission signal; and a centrally located receiver means including a receiving antenna for picking up the radiated transmission signal from said transmitter means and a demodulator means for deriving said base band video signal from the transmission signal received by said receiving antenna to be applied to a video monitor or recorder. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 23, 24)
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21. The wireless video surveillance system of claim wherein the receiver means includes a mixer for combining the signal from said receiving antenna with the mixing frequency signal to generate the intermediate frequency output and further including a narrow band SAW filter to minimize the bandwidth of the intermediate frequency output applied to the demodulator means to derive the base band video signal.
Specification