Signal Recording Trigger Using Reference-Period Change Detection
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Solution Overview
Problem
Conventional recording devices face challenges in efficiently recording signal values over extremely short time periods, leading to rapid RAM overflow and requiring trial-and-error methods to manage recording operations effectively.
Innovation Solution
A recording device that includes a determination reference value obtaining section to analyze signal values during a reference time period and a recording control section to determine and initiate recording based on a recording start condition, which indicates significant changes in signal values after the reference period, thereby optimizing when to start recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal values are recorded over an extremely short sampling period, then the recording precision and time resolution are improved, but the quantity of data increases enormously causing RAM to overflow quickly
Solution Approach 1:
The system performs preliminary analysis during a reference time period before actual recording begins. It calculates statistical values (mean, standard deviation) from signal values during this reference period to establish baseline characteristics, then uses these to determine when significant changes occur that warrant recording, avoiding the need to record all data points from the start
Solution Approach 2:
The system changes the recording parameter from continuous recording of all signal values to selective recording based on deviation from statistical baseline. It records only when the absolute value of deviation between current signal values and the statistical mean exceeds a threshold (multiple of standard deviation), thus transforming the recording strategy from quantity-based to significance-based
2Reliability
If continuous recording is performed to ensure no data is missed, then the reliability of data capture is improved, but the storage capacity is consumed rapidly
Solution Approach 1:
The system implements feedback by continuously monitoring signal values against dynamically calculated statistical thresholds (mean ± n×standard deviation). When signal values exceed these thresholds, indicating significant changes, the system triggers recording. This feedback mechanism ensures reliable capture of important events while avoiding recording of normal fluctuations
Solution Approach 2:
The system performs preliminary statistical analysis during a reference period to establish baseline parameters before actual event detection begins. This preliminary characterization of normal signal behavior enables the system to distinguish between routine variations and significant events requiring recording
3Ease of operation
If trial and error methods are used to determine recording timing, then the ease of operation is worsened requiring significant effort, but the system can eventually find working solutions
Solution Approach 1:
The system performs self-service by automatically determining optimal recording timing through statistical analysis of the input signal characteristics. It calculates the mean and standard deviation from the reference period, dynamically sets thresholds based on these statistics, and autonomously decides when recording should begin without requiring user trial and error or manual configuration
Data Source
AI summary
To allow a time-series change among signal values to be recorded easily for a process of recording the respective time-series values of input signals, a recording device includes: a determination reference value obtaining section configured to obtain a determination reference value on a basis of signal values during a reference time period, the reference time period being a predetermined time period after a start of input of time-series signal values, the determination reference value indicating a feature of the signal values during the reference time period, and a recording control section configured to (i) obtain information on a recording start condition on a basis of the determination reference value, the recording start condition indicating whether, as compared to the signal values during the reference time period, there has been a large change among signal values after the reference time period has elapsed, and (ii) start recording signal values in response to the recording start condition becoming satisfied.