Sensor Device Dynamic Sampling Frequency Control
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Solution Overview
Problem
Existing sensor devices face challenges in efficiently configuring sampling frequencies, leading to increased power consumption and potential data processing issues due to non-ideal frequency matching.
Innovation Solution
A sensor device with a processing unit that allows for the selection of a desired sampling frequency and measurement duration, enabling precise determination of the necessary time distance between consecutive measurements, thereby optimizing sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a lookup table with specified sampling frequencies is used, then the device complexity is reduced, but the adaptability and energy efficiency deteriorate due to large deviations from the required sampling frequency
Solution Approach 1:
The patent implements dynamic sampling frequency adjustment by allowing the processing unit to calculate and apply arbitrary sampling frequencies based on measurement duration and desired frequency parameters, rather than being constrained to fixed lookup table values. This enables the system to adapt continuously to different application requirements while maintaining precise control over sampling timing.
Solution Approach 2:
The system changes the sampling frequency parameter dynamically by computing it from user-defined measurement duration and desired sampling frequency inputs. The processing unit calculates the exact sampling interval (distance in time between consecutive measurements) and applies this calculated parameter, allowing continuous adjustment rather than discrete selection from predefined values.
2Measurement precision
If the sampling frequency is increased to ensure adequate sampling, then the measurement precision is improved, but the energy consumption increases
Solution Approach 1:
The system optimizes the sampling frequency parameter by calculating it precisely from the desired sampling frequency and measurement duration inputs. This allows the processing unit to set the minimum necessary sampling rate to achieve adequate measurement precision, avoiding unnecessary high sampling frequencies that would waste energy. The calculated sampling interval ensures exact timing without over-sampling.
3Device complexity
If a non-ideally matching sampling frequency is used, then the device complexity is reduced, but the reliability deteriorates due to aliasing effects
Solution Approach 1:
The system uses feedback from the desired sampling frequency and measurement duration parameters to calculate and adjust the actual sampling frequency. The processing unit continuously monitors and adjusts the sampling interval to ensure it matches the required frequency exactly, preventing aliasing by maintaining proper frequency alignment between the sensor device and external systems.
Data Source
AI summary
A sensor device. The sensor device includes a sensor element, a processing unit, and a communication interface. The processing unit is configured to receive a desired sampling frequency and a desired measurement duration via the communication interface, and to determine a necessary distance in time between two consecutive measurements depending on the desired sampling frequency and the desired measurement duration, and to sample a measurement signal of the sensor element depending on the necessary distance in time between two consecutive measurements. A method for operating a sensor device is also described.