ASK RF Signal Decoding with Continuous Clock Through Pause Sections
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Solution Overview
Problem
Existing ASK RF signal decoding technologies face challenges in maintaining bit transmission rate stability due to power interruptions during the pause section in ISO/IEC 14443 A-type communication, leading to signal distortion and clock signal discontinuity.
Innovation Solution
An ASK RF signal decoding device and method that separates low and high frequency signals, counts the divided signal during non-pause sections, and generates a clock signal to decode the ASK RF signal without distortion, even with pause sections, using a separation block, decoding block, and universal asynchronous receiver/transmitter (UART) to latch decoded data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied from card reader to IC card during communication, then data transmission can be performed, but power interruption occurs during pause section causing signal distortion
Solution Approach 1:
The patent applies preliminary action by generating and storing a predetermined number of clock signals in advance before the pause section occurs. The IC card prepares a buffer of clock signals that can be used during the power interruption period, ensuring that clock signal continuity is maintained even when power supply is interrupted during the pause section of ASK RF signal transmission.
2Productivity
If clock signal is generated by dividing clock signal including discontinuous section, then bit transmission rate can be maintained, but discontinuous section causes difficulty in maintaining stable bit transmission rate
Solution Approach 1:
The patent implements continuity of useful action by ensuring that the clock signal supplied to the division circuit remains continuous even during power interruptions. By storing predetermined clock signals in advance and supplying them during the pause section, the division operation can continue without interruption, maintaining stable bit transmission rate throughout the communication process.
3Ease of operation
If ASK RF signal is decoded during pause section with power interruption, then decoding can be performed, but signal distortion occurs making accurate decoding difficult
Solution Approach 1:
The patent applies preliminary action by generating clock signals in advance before the pause section and storing them for later use. This pre-prepared clock signal buffer enables the decoding circuit to maintain accurate timing references even when power is interrupted during the pause section, thereby maintaining decoding accuracy despite the challenging conditions.
Data Source
AI summary
An amplitude-shift-keying radio-frequency (ASK RF) signal decoding method includes separating a low frequency and a high frequency from an ASK RF signal, which includes a pause section and a non-pause section, generating a divided signal by dividing the high frequency signal, counting the divided signal for the non-pause section of the low frequency signal, and decoding the ASK RF signal based on a result of the counting.