Audio Interface RFID Reader Using Multi-Frequency Modulation
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Solution Overview
Problem
Existing RFID/UHF label reading technologies are limited to near-distance communication, allowing only single-label information to be read in a short distance, which restricts reading scope and efficiency.
Innovation Solution
A method and device utilizing an audio interface to send and receive digital signals through an audio communication circuit, converting them into square wave signals, and using an RFID/UHF controller to modulate multiple frequency points for multi-channel communication, with a power amplifier and antenna module to extend communication distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If near-distance radio communication of RFID/NFC is used, then data exchange can be completed at a single frequency point, but the reading scope and reading efficiency are greatly limited
Solution Approach 1:
The patent dynamically switches between multiple frequency points (300-3000 MHz) during the reading process. The system does not operate at a fixed frequency but adaptively adjusts the frequency based on signal feedback, allowing the reading scope to expand dynamically while maintaining high reading efficiency through optimized frequency selection.
Solution Approach 2:
The patent changes the operating frequency parameter across a wide range (300-3000 MHz) to overcome the limitations of single-frequency operation. By sweeping through multiple frequency points and selecting the optimal frequency for communication, the system simultaneously expands reading scope and maintains high reading efficiency.
2Ease of operation
If single frequency point communication is used, then the system is simple to operate, but only single label information can be read in a short distance
Solution Approach 1:
The system performs automatic frequency scanning and selection without requiring manual intervention. The controller autonomously sweeps through multiple frequency points, identifies the optimal frequency for communication, and adjusts operating parameters automatically, maintaining ease of operation while extending communication distance through multi-frequency operation.
Solution Approach 2:
The system dynamically adapts to different communication distances by automatically adjusting the operating frequency and power amplifier settings. This dynamic parameter adjustment allows the system to maintain simple operation while achieving extended communication range through intelligent frequency and power management.
3Productivity
If multiple frequency points are transmitted simultaneously, then multi-channel data exchange is achieved, but signal interference and collision may occur
Solution Approach 1:
The patent implements a feedback mechanism where the system monitors signal quality and label responses at each frequency point. Based on this feedback, the controller adjusts the transmission strategy, avoiding frequencies with high interference and optimizing the selection of multiple frequency points for simultaneous data exchange, thereby maintaining both high productivity and signal reliability.
Solution Approach 2:
The system transmits signals at multiple frequency points but selectively activates only those frequencies that provide useful communication channels. By using partial action (selecting optimal frequencies from the available spectrum) rather than excessive action (using all possible frequencies), the system achieves multi-channel data exchange while minimizing interference and maintaining reliable transmission.
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 simultaneous data exchange with multiple RFID/UHF labels over a longer distance, enhancing reading efficiency and compatibility with international audio interface standards.
Implementation Method 1
The audio communication circuit in the read-write module converts the analogue signal sent by the electronic device into a square wave signal
Implementation Method 2
The plurality of radio frequency signals fed back by the above labels are amplified by the power amplifier PA
Implementation Method 3
an antenna transmitting and receiving module with matched impedance sends the amplified signals to form an electromagnetic field and receives radio frequency signals fed back
Data Source
AI summary
A method and a device for reading RFID/UHF label based on an audio interface are disclosed. According to the method, a built-in software module in an electronic device converts a first digital signal into an analog signal capable of being transmitted via the audio interface; the analog signal received by the audio interface is converted into a second digital signal via an audio communication circuit; then the RFID/UHF controller for digital signal control reads information from the RFID/UHF label; the RFID/UHF controller modulates and sends signals of a plurality of different frequency points, and the signal of every frequency point forms a signal channel. Compared with the prior art, the present invention can keep long-distance communication between the electronic device and a plurality of labels.