Oversampled Data Transfer Compression for Control Frame Size Limits
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Solution Overview
Problem
The existing data transfer systems face challenges in reducing the large data size of data frames transmitted to control devices, especially when oversampling is performed, leading to data size restrictions and inefficiencies.
Innovation Solution
A data transfer device that acquires measurement results from multiple sampling processes and compresses subsequent sampling data based on the maximum change between consecutive processes, reducing the data size by representing changes with a smaller data size sufficient for the maximum change, thereby transmitting only the necessary data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If oversampling is performed to improve measurement accuracy, then measurement precision is improved, but data size of transmitted data frames increases
Solution Approach 1:
The patent extracts and transmits only the essential information - the change amount between consecutive sampling values - rather than transmitting complete sampling data. This removes redundant information while preserving measurement accuracy, allowing oversampling to be performed without proportionally increasing transmitted data size
Solution Approach 2:
The patent changes the representation parameter from absolute sampling values to differential change amounts. By transmitting the difference between consecutive samples rather than the raw sample values, the data size is reduced while still enabling accurate reconstruction of measurement results at the control device
2Reliability
If complete sampling data is transmitted to ensure accurate control, then reliability is improved, but loss of time increases due to larger data transmission
Solution Approach 1:
The patent extracts only the necessary information (change amounts) for accurate control reconstruction, eliminating redundant data transmission. This reduces transmission time while maintaining control reliability through differential data representation
Solution Approach 2:
The patent implements periodic differential encoding where each sampling value is represented as a change from the previous sample. This periodic pattern recognition allows efficient compression of time-series data, reducing transmission time while preserving complete measurement information for control accuracy
Data Source
AI summary
The present invention suppresses the data size of a data frame to be transmitted to a control device at every control period even if oversampling is performed. A counter unit (10) compresses the data size of sampling data (Sd) indicating a second or subsequent count value (Ct) to the number of bits by which the maximum (Vmax) of a count value countable in one sampling processing can be represented.