Two-Wire Data Carrier Demodulation During Frequency Calibration
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Solution Overview
Problem
Existing two-wire communication systems face delays in starting data communication due to the need for a calibration period to stabilize frequency determination, which is essential for reliable data transmission using pulse signals with modulated duty ratio and frequency.
Innovation Solution
A data carrier apparatus with first and second determination units for duty ratio and frequency determination, respectively, and a calibration unit for reference value calibration, allowing demodulation to start during a calibration period and transition to stable frequency determination without a pre-calibration delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If calibration of reference value is performed before starting data communication, then stable frequency determination is achieved, but data communication start timing is delayed
Solution Approach 1:
The patent performs preliminary calibration of the reference value during the initial data communication period rather than before communication starts. The calibration unit calibrates the reference value for frequency determination by using the received pulse signal characteristics during the first data communication period, enabling stable frequency determination for subsequent periods without pre-calibration delay.
Solution Approach 2:
The patent maintains continuous data communication while performing calibration operations. The calibration of the reference value is executed during the first data communication period without interrupting the communication flow, allowing the useful action of data transmission to continue uninterrupted while the calibration process occurs in parallel.
2Productivity
If multi-level data communication using duty ratio and frequency modulation is implemented, then communication rate is increased, but complexity of frequency determination increases
Solution Approach 1:
The patent uses feedback from the received pulse signal to automatically calibrate the reference value for frequency determination. The calibration unit monitors the actual frequency characteristics of received pulses during the first communication period and adjusts the reference value accordingly, creating a self-correcting system that handles the complexity of multi-level modulation automatically.
Solution Approach 2:
The patent dynamically adjusts the reference value parameter for frequency determination based on actual received signal characteristics. By changing the reference value from a fixed predetermined value to a calibrated value derived from actual communication signals, the system adapts to the multi-level modulation scheme without requiring complex manual configuration.
Data Source
AI summary
In a data carrier apparatus, a first determination unit determines a duty ratio of each pulse of a pulse signal received from a data carrier driving apparatus, and a second determination unit determines a frequency of each pulse of the received pulse signal. A calibration unit performs calibration of a reference value to be used for determination performed by the second determination unit, during a calibration period. A demodulation unit demodulates data conveyed by the received pulse signal. The demodulation unit performs first demodulation based on a determination result of the first determination unit during the calibration period, and start second demodulation based on the determination result of the first determination unit and a determination result of the second determination unit when the calibration period ends.