Multiwire Communication Bus for Video Door Entry Systems
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Solution Overview
Problem
Existing electronic systems for video door entry communication and home automation require multiple specialized cables, leading to increased installation costs and times due to the need for proprietary cables, which limits system performance and connectivity distances.
Innovation Solution
An electronic system utilizing a multiwire communication BUS with eight conductors twisted in pairs, specifically CAT5 or similar cables, to enable efficient transmission of digital controls, audio, and video signals, along with internal switching step-down power supplies to manage high ohmic drop and ensure reliable signal quality over long distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple specialized cables are used for different functions (video, audio, power, data), then system reliability and signal quality are improved, but installation complexity and cost increase
Solution Approach 1:
The patent combines multiple specialized cables (video, audio, power, data) into a single multiwire communication BUS that integrates all these functions. This merging approach maintains system reliability by preserving dedicated signal paths while reducing installation complexity by requiring only one cable type to be installed throughout the system.
Solution Approach 2:
The multiwire communication BUS serves multiple functions simultaneously - it provides power supply, digital data communication, and analogue audio/video signal transmission. This universal cable replaces multiple specialized cables, simplifying installation while maintaining all necessary system functions through a single standardized interface.
2Reliability
If proprietary cables are used, then system performance is optimized, but installation time and cost increase
Solution Approach 1:
The system uses a universal multiwire communication BUS that can be implemented with standard cable types rather than proprietary cables. This allows installers to use readily available cables from any supplier, significantly reducing installation time while maintaining system performance through standardized design specifications.
Solution Approach 2:
The patent specifies particular parameters for the multiwire communication BUS (such as conductor gauge, insulation properties, and impedance characteristics) that ensure optimal system performance. By defining these parameters rather than requiring proprietary cables, the system achieves performance optimization while allowing flexibility in cable selection and faster installation.
3Length of stationary object
If system is sized for long-distance connections, then connectivity distance is improved, but signal quality deteriorates
Solution Approach 1:
The integration of power supply and signal transmission in the same multiwire communication BUS allows for optimized power distribution along the entire cable length. This enables long-distance connections while maintaining signal quality through centralized power management and compensation techniques built into the unified system architecture.
Solution Approach 2:
The system employs parameter optimization including specific conductor materials, gauge sizes, and impedance matching techniques tailored for long-distance transmission. These parameter changes enable the multiwire communication BUS to maintain high signal quality over extended distances while providing adequate power supply to remote devices.
4Ease of manufacture
If standard cables are used instead of proprietary cables, then installation cost is reduced, but system performance is compromised
Solution Approach 1:
The multiwire communication BUS is designed as a universal interface that works with standard cable types available from any supplier. This eliminates the need for expensive proprietary cables while maintaining system performance through standardized electrical characteristics and robust protocol design that ensures reliable operation with conventional cable implementations.
Solution Approach 2:
The system specifies critical electrical parameters (impedance, voltage levels, current capacity) for the multiwire communication BUS that ensure compatibility with standard cables. By controlling these parameters rather than requiring proprietary cable constructions, the system achieves both cost reduction and performance reliability simultaneously.
Data Source
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AI summary
The present invention relates to an electronic system for video door entry communication and/or for home automation, such as for example a door entry or a video door entry system, or a home automation system, which comprises a plurality of electronic devices (11-16; 11 '-16') connected in parallel to a multiwire communication BUS (19) for exchanging digital data, digital control signals, analogue audio signals and analogue video signals, the multiwire communication BUS (19) further being connected to remote power supply means (20) for the power supply of the electronic devices (11-16; 11'-16'), and is characterised in that the multiwire communication BUS (19) is made by means of a cable with eight conductors twisted in pairs.