Shared Wiring Backbone for PA and Clock Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Installing a master/slave clock system in existing buildings is expensive and difficult due to the need for separate wiring for power and control signals, and wireless systems suffer from unreliable synchronization and high maintenance costs.
Innovation Solution
A signaling system that shares a common wiring backbone with a public address (PA) system, using transformers to distribute balanced AC signals and superimposing DC power and correction signals on the audio amplifiers' outputs, allowing slave clocks to receive synchronization and power through the existing infrastructure while avoiding interference with AC signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wiring is installed for clock system power and control signals, then reliable time synchronization is achieved, but installation cost and complexity increase
Solution Approach 1:
The patent combines the clock system power and control signals with the existing PA system wiring backbone. The slave clocks are powered through the same wiring infrastructure that distributes audio signals, eliminating the need for separate power and control wiring. This merging approach reduces installation complexity while maintaining reliable synchronization through the shared infrastructure.
Solution Approach 2:
The existing PA system wiring backbone is made multi-functional by enabling it to carry both audio signals and clock system power/control signals. The wiring infrastructure serves dual purposes: distributing audio to speakers and providing power and synchronization to slave clocks, thereby reducing the need for additional dedicated wiring.
2Ease of operation
If wireless RF synchronization is used for slave clocks, then installation ease is improved, but synchronization reliability deteriorates due to signal attenuation
Solution Approach 1:
The patent uses the existing PA system wiring backbone as an intermediary medium to transmit clock synchronization signals. Instead of relying on wireless RF signals that attenuate through building structures, the synchronization signals are transmitted through the wired infrastructure that already penetrates all rooms, ensuring reliable delivery without signal degradation.
3Adaptability or versatility
If DC power and correction signals are superimposed on AC audio signals, then single wiring infrastructure is utilized, but signal interference may occur
Solution Approach 1:
The patent employs periodic action by enabling the clock system to operate in synchronization with the PA system's operational cycles. The DC power and correction signals are transmitted during periods when the AC audio signals are not actively being used, or at frequencies that do not conflict with the audio signal bandwidth, thereby minimizing interference while utilizing the shared wiring infrastructure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables reliable time synchronization and power delivery to slave clocks without the need for new wiring, reducing installation costs and maintenance while maintaining compatibility with existing audio systems.
Implementation Method 1
The output transformer typically steps up the amplifier voltage, while the input transformer steps down the voltage at the speaker terminals
Implementation Method 2
a transformer at the output of the amplifier isolates and de-couples the amplifier from other electronics connected to the wiring backbone
Implementation Method 3
using transformers to distribute balanced AC signals and superimposing DC power and correction signals on the audio amplifiers' outputs
Data Source
AI summary
A signaling system may include two subsystems that share a common wiring backbone and provide public awareness functions. The two subsystems may be a public address system and a master/slave clock system. Remote rooms at the tail end of the wiring backbone include a speaker and a slave clock. The speakers are in communication with a control device through the wiring backbone. The slave clocks are in communication with another control device at the head end of the wiring backbone. The master/slave clock system superimposes its DC power signal and a time correction signal on the wiring backbone. Each slave clock interfaces the wiring infrastructure through a center tap of a speaker transformer which allows the slave clock to be powered and corrected via the speaker wiring infrastructure.