US 2003/0189638 A1Published application

Narrow bandwidth, high resolution video surveillance system and frequency hopped, spread spectrum transmission method

OwnerTerry L. Fryinventor

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Abstract

A video surveillance system includes a video surveillance camera and a frequency hopping spread spectrum (FHSS) transmitter for efficiently and economically transmitting high resolution video signals from the video signal source in the license-free ISM bands (e.g., at 900 MHz, 2.4 GHz, or 5.2 GHz) to a FHSS receiver adapted to receive and demodulate the FHSS signal and generate a complete, intact composite analog video signal directly therefrom. Complete and intact means that all of the composite analog video signal is transmitted and received, including the original line sync and frame sync signals, without requiring any further processing. The FHSS hop duration (or dwell time) and tuning frequency of each frequency hop are selected to permit sensing and modulation of the complete, intact composite analog video signal directly from the analog video signal source, whereupon that complete, intact composite analog video signal is transmitted, hop by hop, to a FHSS receiver, preferably using only the vestigial side band portion of the complete, intact composite analog video signal, to provide a high-resolution, narrow-bandwidth video surveillance system.

Claims21

Dependent claims

A video surveillance system, comprising:

(a) a first video surveillance camera adapted to generate a first analog composite video signal including frame synchronization pulses and line synchronization pulses;
(b) a first frequency-hopped spread spectrum transmitter having a programmable processor, memory, and an input circuit connected to said first video surveillance camera and adapted to sense said first analog composite video signal including said frame synchronization pulses and said line synchronization pulses,
(c) said first frequency-hopped spread spectrum transmitter being programmed to select a first hop tuning frequency from a plurality of pre-assigned selected frequency band hop frequencies stored in said transmitter memory;
(d) said first frequency-hopped spread spectrum transmitter having a first tunable oscillator tunable to any of said plurality of pre-assigned selected frequency band frequencies;
(e) said first frequency-hopped spread spectrum transmitter input circuit being configured to detect said first analog composite video signal frame synchronization pulses,
(f) said first frequency-hopped spread spectrum transmitter being programmed to synchronize transmitter frequency hop timing in response to detection of said first analog composite video signal frame synchronization pulses and modulate said first analog composite video signal including said first analog composite video signal frame synchronization pulses and said line synchronization pulses onto a carrier at said first selected hop frequency for a selected hop frequency dwell time;
and
(g) a frequency-hopped spread spectrum receiver programmed to demodulate said modulated first analog composite video signal including said frame synchronization pulses and said line synchronization pulses at said first transmitter first selected hop frequency and generate a first baseband composite analog video signal in response thereto.

5 more elements

A method for transmitting an analog composite video signal including frame synchronization pulses and line synchronization pulses with frequency-hopping spread spectrum signals, comprising:

(a) selecting a frequency-hopping spread spectrum transmitter first hop tuning frequency from a plurality of pre-assigned selected frequency band hop frequencies stored in a frequency-hopping spread spectrum transmitter memory;
(b) sensing an analog composite video signal including frame synchronization pulses and line synchronization pulses;
(c) synchronizing a frequency-hopping spread spectrum transmitter frequency-hopping hop rate and selected hop frequency dwell time to one of said analog composite video signal synchronization pulses;
wherein said transmitter frequency hops are triggered by detection of said analog composite video signal synchronization pulses;
and
(d) modulating said analog video signal onto a carrier tuned to said first hop tuning frequency for said selected hop frequency dwell time.

3 more elements

A method for transmitting an analog composite video signal including periodic frame synchronization pulses and periodic line synchronization pulses using a frequency-hopping spread spectrum transmitter, comprising:

(a) sensing an analog composite video signal including frame synchronization pulses and line synchronization pulses;
(b) selecting a frequency-hopping spread spectrum transmitter first hop tuning frequency from a plurality of pre-assigned selected frequency band hop frequencies stored in a frequency-hopping spread spectrum transmitter memory;
(c) detecting a selected analog composite video signal periodic synchronization pulse and synchronizing a frequency-hopping spread spectrum transmitter frequency-hopping hop rate to said selected analog composite video signal synchronization pulses, wherein said transmitter frequency hop is triggered by detection of said selected analog composite video signal synchronization pulses;
and
(d) modulating said analog video signal onto a carrier tuned to said first hop tuning frequency until a subsequent selected analog composite video signal synchronization pulse is detected.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/261,722Filed 30 Sep 2002
Priority: 9 Apr 2002
Published: 9 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H04B 1/713
Spread spectrum techniques: using frequency hopping
H04N 5/40
Transmitter circuitry for the transmission of television signals according to analogue transmission standards: modulation circuits
H04N 7/18
Television systems: closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
H04N 7/20
Television systems: adaptations for transmission via a GHz frequency band, e.g. via satellite