Workstation Proximity Subsystem Signal Interference Avoidance
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Solution Overview
Problem
Existing point-of-transaction workstations experience accidental generation of illumination light when their presentation windows face each other, leading to power wastage, reduced operational lifetime, and customer annoyance, requiring manual and time-consuming reconfiguration to prevent.
Innovation Solution
A system with a magnetometer in each workstation to determine the direction of its presentation window, controlling the product proximity detection subsystem to emit and receive signals with specific characteristics, preventing false triggering and illumination when windows face each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If workstations are positioned with mutually facing presentation windows to maximize space utilization and accessibility, then venue layout efficiency is improved, but signal interference between IR emitters and sensors causes false triggering and illumination light generation
Solution Approach 1:
The system dynamically changes the operational parameters of the IR emitter by switching between different signal characteristics (frequency, modulation pattern, or wavelength) based on the detected orientation of the presentation window. When another workstation is detected facing the same direction, the system automatically switches to a different signal characteristic to avoid interference, allowing both workstations to operate simultaneously without false triggering.
Solution Approach 2:
The system employs dynamic adaptation by continuously monitoring the orientation of the presentation window using a magnetometer and adjusting the signal characteristics in real-time. This dynamic behavior allows the system to respond to changing environmental conditions (presence of other workstations) and maintain reliable operation without manual reconfiguration.
2Reliability
If manual reconfiguration of workstations is performed to prevent signal interference, then signal detection reliability is improved, but installation time and complexity increase
Solution Approach 1:
The system performs self-configuration by automatically detecting the orientation of its presentation window using a magnetometer and selecting appropriate signal characteristics without requiring manual intervention. The workstation independently determines whether another workstation is facing it and adjusts its IR signal accordingly, eliminating the need for skilled personnel to manually reconfigure each device during installation.
Solution Approach 2:
The system pre-programs multiple signal characteristics into its controller and pre-establishes the capability to detect orientation and switch between signals. This preliminary preparation allows the system to immediately adapt to interference conditions without requiring time-consuming manual configuration during installation or deployment.
3Measurement precision
If illumination light is generated in response to IR signal detection to enable target reading, then reading accuracy is improved, but false triggering due to signal interference causes unnecessary illumination and power wastage
Solution Approach 1:
By changing the IR signal characteristics (frequency, modulation, or wavelength) when interference is detected, the system prevents false triggering of the illumination system. This ensures that illumination light is only generated when a valid target is detected, not when another workstation's IR emitter is mistakenly detected, thereby reducing unnecessary power consumption while maintaining reading accuracy when needed.
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
Automatically avoids signal interference and illumination light generation between workstations, reducing power consumption and extending operational lifetime without the need for manual reconfiguration or skilled personnel.
Implementation Method 1
A magnetometer is mounted in each workstation. Each magnetometer determines a direction faced by a respective presentation window.
Implementation Method 2
an infrared (IR) emitter operative for emitting IR light into an IR emission field, and an IR sensor for sensing the return IR light within an IR detection field of view. A product entering the IR emission field reflected and/or scattered at least a portion of the emitted IR light incident on the product to the IR sensor.
Implementation Method 3
Return light returning from the target in the laser-based reader and/or in the imager-based reader was detected to generate an electrical signal indicative of the target.
Data Source
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AI summary
Signal interference is automatically avoided between product proximity subsystems that emit signals through mutually facing presentation windows of different workstations. A magnetometer in each workstation determines a direction faced by a respective presentation window. A controller in each workstation controls a respective product proximity subsystem to emit and receive a signal with a first signal characteristic when the respective magnetometer determines that the respective presentation window faces a first direction, and controls a respective product proximity subsystem to emit and receive a signal with a different second signal characteristic when the respective magnetometer determines that the respective presentation window faces a different second direction.