Sensor Apparatus Crosstalk Reduction via Frequency Control
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Solution Overview
Problem
Existing wearable devices face challenges in simultaneously using inertial and structure-borne sound sensors due to crosstalk issues, which affect the accuracy of control commands and noise suppression, especially in devices with limited space like in-ear headphones.
Innovation Solution
A sensor apparatus that includes an inertial sensor device and a structure-borne sound sensor device, controlled by a control device using an external clock signal to select operating frequencies that maximize differences or exceed thresholds, thereby preventing crosstalk, and integrates both sensors into a common package using an analog-digital converter and upsampling device to optimize sampling rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If inertial sensor device and structure-borne sound sensor device are integrated into a common package, then space requirements are minimized, but crosstalk between sensors occurs affecting measurement accuracy
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the operating frequency of the structure-borne sound sensor device based on the operating frequency of the inertial sensor device. The control device selects an operating frequency for the structure-borne sound sensor that maintains a sufficient frequency difference from the inertial sensor, thereby preventing crosstalk while allowing both sensors to coexist in a compact integrated package.
2Measurement precision
If structure-borne sound sensor device operates at high sampling rates, then noise suppression accuracy is improved, but crosstalk with inertial sensor increases
Solution Approach 1:
The patent resolves this contradiction by dynamically changing the operating frequency parameter of the structure-borne sound sensor device. The control device monitors the operating frequency of the inertial sensor and adjusts the structure-borne sound sensor's frequency to maintain optimal separation, enabling high sampling rates for accurate noise suppression without causing crosstalk interference.
Solution Approach 2:
The system implements dynamics by making the operating frequency of the structure-borne sound sensor device adjustable and adaptive rather than fixed. The control device dynamically selects the operating frequency based on real-time conditions and the inertial sensor's operating frequency, allowing the system to optimize performance while avoiding interference.
3Device complexity
If inertial sensor and structure-borne sound sensor share common package, then device complexity is reduced, but frequency interference occurs
Solution Approach 1:
The patent applies parameter changes by implementing a control device that dynamically adjusts the operating frequency of the structure-borne sound sensor based on the inertial sensor's frequency. This frequency adaptation mechanism prevents frequency interference while maintaining the benefits of a simplified integrated package design with reduced device complexity.
Data Source
AI summary
A sensor apparatus. The sensor apparatus includes an interface which is designed to receive an external clock signal. The sensor apparatus also includes an inertial sensor device which is designed to generate an inertial sensor measurement signal, a structure-borne sound sensor device which is designed to generate a structure-borne sound measurement signal, and a control device which is designed to control the structure-borne sound sensor device with a control signal that depends on the external clock signal in order to operate the structure-borne sound sensor device depending on the control signal at an operating frequency selected from a plurality of possible operating frequencies.