Portable Device History Display via On-Demand Variation Calculation
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Solution Overview
Problem
Portable electronic devices face memory management challenges when storing series of values for multiple measured variables, particularly in terms of space requirements and power consumption, especially when measurement durations are long, leading to less representative stored values.
Innovation Solution
A portable electronic device that displays two chronological value sequences in parallel within a predetermined time interval, where one sequence represents the measurement values and the other represents the variation in time of the measurement, with the latter calculated during acquisition and display modes, optimizing memory usage by storing only a single series of values and calculating the variation series on demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple series of values for different measured variables are stored in memory, then the historical record completeness is improved, but the memory space requirements and power consumption increase significantly
Solution Approach 1:
The patent extracts only the essential data (single series of values with timestamps) from what would otherwise require storing multiple complete value series. By separating the raw measurement data storage from the derived variation data calculation, the system minimizes stored data while maintaining the ability to reconstruct complete historical records when needed.
Solution Approach 2:
The stored single series of values serves multiple purposes: it can be used directly as historical measurement data, and it can also serve as the basis for calculating variation over time when displayed. This multi-functional use of the stored data eliminates the need for separate storage of variation data series.
2Loss of information
If multiple series of values are stored to represent different measured variables, then the data representation accuracy is improved, but the power consumption increases
Solution Approach 1:
The system extracts and stores only the essential measurement values with timestamps, avoiding the energy cost of storing and processing multiple redundant data series. The variation information is derived on-demand from this compact stored data, maintaining accuracy while minimizing power consumption.
3Quantity of substance
If the interval between successive recordings is increased to reduce memory usage, then the memory space requirements are reduced, but the representativeness of stored values deteriorates
Solution Approach 1:
The system performs preliminary calculation of variation over time from the stored measurement values during the display process. This allows the use of larger recording intervals without losing representativeness, because the variation data is derived mathematically from the stored points rather than requiring continuous storage of all intermediate values.
Data Source
AI summary
The present invention relates to a portable electronic device (1) comprising at least two analog display elements (16, 17) to display the current time in a first operating mode, the time mode, the electronic device (1) additionally comprising a sensor (23) for a physical magnitude to measure the value of this physical magnitude as a function of time in a second operating mode and memory elements (25, 26) intended to store at least a portion of the measured values with a given period. The display elements can be controlled in the second operating mode to respectively display a value representative of the measured physical magnitude and a calculated value representative of the variation in time of the physical magnitude. The electronic device (1) has a third operating mode, the history mode, in which the analog display elements (17, 16) are actuated to respectively display, chronologically and with a time interval of predefined duration, values representative of the physical magnitude on the basis of the stored values and values representative of the variation in time of the physical magnitude calculated on the basis of the stored values. The invention also relates to a method of displaying a history.