Sensor Module Dynamic Sampling Period Adjustment
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Solution Overview
Problem
Existing inertial sensor systems face a tradeoff between quantization error and signal processing limitations due to varying sampling periods, where shorter periods reduce quantization error but limit processing, and longer periods increase error but allow more processing, necessitating an optimal balance.
Innovation Solution
A sensor module with a processing circuit that dynamically adjusts the sampling period and signal processing content based on the requirements of the host device, employing multiple signal processing modes to balance quantization error and processing limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sampling period becomes shorter, then the quantization error becomes smaller, but the signal processing that can be executed during the sampling becomes limited
Solution Approach 1:
The patent applies dynamics by making the sampling period variable rather than fixed. The control unit dynamically adjusts the sampling period based on the type of signal processing requested by the external device. When high-precision measurement is needed, a shorter sampling period is used; when complex signal processing is required, a longer sampling period is used. This dynamic adjustment resolves the contradiction between quantization error reduction and signal processing capability.
Solution Approach 2:
The patent changes the parameter of sampling period based on different processing requirements. The control unit receives processing type information from the external device and adjusts the sampling period parameter accordingly. This parameter change allows the system to optimize between measurement precision (shorter period) and processing capability (longer period) based on actual needs.
2Productivity
If the sampling period becomes longer, then the quantization error becomes greater, but the signal processing that can be executed during the sampling is less likely to be limited
Solution Approach 1:
The system dynamically adjusts the sampling period based on processing requirements. When the external device requests complex signal processing, the control unit extends the sampling period to provide sufficient processing time. When simple processing or high-precision measurement is needed, the sampling period is shortened. This dynamic behavior resolves the contradiction by adapting to different operational contexts.
Solution Approach 2:
The sampling period parameter is changed according to the type of signal processing required. The control unit modifies this parameter based on instructions from the external device, allowing the system to prioritize either processing capability or measurement precision depending on the specific application needs.
Data Source
AI summary
A sensor module includes: an inertial sensor; and a processing circuit processing an output signal from the inertial sensor. The processing circuit varies processing of the output signal according to a sampling period for acquiring the output signal. The processing circuit may change the sampling period for acquiring the output signal according to a content of processing of the output signal.