Multicamera Video Alarm System with Motion Sensor Encoding
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Solution Overview
Problem
Existing remote surveillance security systems face high costs, unreliability, radio frequency interference, and manual intervention requirements due to separate digital selective calling systems and internet-based video transmissions, which complicate the identification of triggering events in video monitors.
Innovation Solution
A surveillance system that combines video information with motion sensor outputs using LEDs or integrated circuit registers to transmit discrete detector information via radio, allowing for automatic decoding and alert signaling at a remote location, reducing costs and improving reliability through spread spectrum transmission and automatic event logging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Internet service is used to transmit video feeds to an offsite location, then video transmission capability is improved, but system cost and reliability deteriorate due to high costs and frequent interruptions
Solution Approach 1:
The patent replaces Internet-based transmission with a radio frequency communication system. The video camera captures images, converts them to radio frequency signals, and transmits them wirelessly to a receiver at the offsite location. This substitution eliminates dependency on Internet infrastructure, reducing both cost and interruption risks while maintaining reliable video transmission capability.
2Ease of operation
If separate DSC system is used to report alarm triggers, then alarm notification capability is improved, but system cost and complexity deteriorate due to additional separate system requirements
Solution Approach 1:
The patent merges the alarm notification function into the video transmission system itself. Motion detectors are integrated with the video camera, and when motion is detected, the system automatically sends a notification signal through the same radio frequency channel used for video transmission. This eliminates the need for a separate DSC system, reducing overall system complexity while maintaining alarm notification capability.
Solution Approach 2:
The radio frequency communication system serves multiple functions: it transmits video feeds, sends alarm notifications, and provides two-way communication. This multi-functionality replaces what would otherwise require separate systems for video surveillance and alarm notification, simplifying the overall system architecture.
3Device complexity
If manual checking of videos is required after alarm activation, then system simplicity is improved, but response time and productivity deteriorate due to time lags in identifying triggering events
Solution Approach 1:
The patent implements automatic feedback mechanisms where motion detectors continuously monitor the environment and provide real-time feedback to the control system. When motion is detected, the system immediately processes and transmits the relevant video feed to the offsite location, eliminating the need for manual video checking. This automated feedback loop significantly reduces response time while maintaining system simplicity.
Solution Approach 2:
The system performs preliminary actions by pre-processing video feeds and preparing them for transmission before alarm activation occurs. When motion is detected, the relevant video is already captured and ready for immediate transmission, eliminating delays associated with manual video review and enabling faster response to triggering events.
4Reliability
If radio transmitters are utilized for video transmission, then system cost and reliability are improved, but signal quality deteriorates due to significant interference in populated areas
Solution Approach 1:
The patent employs spread spectrum modulation techniques as an intermediary method to transmit video signals. This technique spreads the signal across a wide frequency band, making it resistant to narrowband interference and noise. The spread spectrum approach acts as a mediator that protects the video transmission from radio frequency interference while maintaining reliable communication in populated areas.
Data Source
AI summary
A television based alarm system provides video streams from multiple cameras produced at a first location that is transmitted via a radio transmitter to a secondary location. Motion detector signals from a plurality of motion detectors at the first location are utilized to indicate when and which cameras are likely to see an intruder based on when and which motion detectors are tripped. In a first type of encoder/decoder, motion detectors are connected to LEDS for encoding and then decoded utilizing photo electric cells. In another encoder/decoder, motion detector signals are used to produce a digital word that is added to the video signal and then decoded as a digital word. An output device such as a printer can be used to print the motion detector number, date, and time print out and sound an alarm.