Adaptive Barometer Sampling Around Speaker and Haptic Noise
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Solution Overview
Problem
Barometers in personal electronics are prone to noise interference from features like speakers and haptic actuators, which degrades measurement accuracy and battery life due to low sampling rates to conserve power.
Innovation Solution
A device configures variable sampling rates for the barometer based on noise conditions from other hardware, delaying measurements if noise is detected and increasing rates when noise is high, using a timer and buffer intervals to optimize data acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If barometer sampling rate is increased to improve measurement accuracy, then measurement precision improves, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the barometer sampling rate variable rather than fixed. The system dynamically adjusts the sampling interval based on real-time noise conditions detected from accelerometers and other sensors. When noise levels are high, the sampling rate is reduced or suspended; when noise levels are low, the sampling rate increases. This dynamic adaptation resolves the contradiction by optimizing measurement accuracy only when conditions permit, thereby reducing overall power consumption while maintaining measurement precision when needed.
Solution Approach 2:
The system changes the sampling interval parameter based on detected noise conditions. The processor monitors accelerometer data and other noise indicators, then adjusts the barometer sampling interval accordingly. This parameter change allows the system to transition between different sampling rates, achieving high measurement accuracy when noise is low while conserving power when noise is high, thus resolving the contradiction between measurement precision and power consumption.
2Measurement precision
If barometer sampling rate is increased to improve measurement accuracy, then measurement precision improves, but battery life deteriorates
Solution Approach 1:
The system dynamically adjusts barometer sampling based on real-time noise conditions. By making the sampling rate variable rather than continuously high, the system extends battery life while maintaining measurement accuracy when conditions are favorable. The processor monitors noise indicators and adapts the sampling schedule, ensuring high measurement precision only when noise levels permit, thereby extending operational duration and battery life.
Solution Approach 2:
The sampling interval parameter is changed based on detected environmental conditions. When noise levels exceed thresholds, the system increases the sampling interval or suspends sampling temporarily. This parameter adjustment reduces power consumption during high-noise periods, extending battery life while preserving the ability to achieve high measurement accuracy during low-noise periods.
3Measurement precision
If noise filtering is applied to improve measurement accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent uses other sensors (accelerometers, microphones, proximity sensors) as intermediaries to detect noise conditions. Instead of implementing complex filtering algorithms on barometer data, the system uses these intermediary sensors to monitor environmental noise and control barometer sampling accordingly. This approach improves measurement precision by avoiding sampling during high-noise periods while maintaining relatively simple device architecture, as the intermediary sensors are typically already present in modern devices.
Solution Approach 2:
The system implements feedback by continuously monitoring noise conditions through accelerometer and other sensor data, then using this feedback to adjust barometer sampling rates. The processor receives feedback from noise-indicating sensors and modifies sampling behavior in response. This feedback mechanism improves measurement precision adaptively while keeping the system relatively simple, as it leverages existing sensor feedback pathways rather than requiring complex dedicated filtering hardware.
4Volume of moving object
If barometer is placed near speaker for compact design, then device compactness improves, but measurement accuracy deteriorates due to noise interference
Solution Approach 1:
The system dynamically adjusts barometer sampling based on detected speaker activity and noise conditions. When the speaker is active or high noise is detected, the system increases sampling intervals or suspends sampling temporarily. This dynamic adaptation allows the barometer to be placed near the speaker for compact design while maintaining measurement accuracy by avoiding sampling during high-noise periods. The processor monitors noise indicators and adapts sampling behavior in real-time.
Solution Approach 2:
The sampling interval parameter is changed based on detected noise conditions from speaker activity or other sources. When noise levels exceed thresholds, the system increases the sampling interval or suspends sampling. This parameter change allows compact placement of the barometer near the speaker while preserving measurement accuracy by adapting the sampling rate to environmental conditions, thus resolving the contradiction between compactness and measurement precision.
Data Source
AI summary
A personal electronic device is provided with a feature of intelligently adjusting a sampling rate of sensors, such as barometers. Before acquiring a measurement from the sensor, the device checks other hardware for conditions that could introduce noise into the measurement. If the device does not determine that excessive noise is likely after checking the other hardware, the device proceeds to acquire the measurement from the sensor. Otherwise, the device delays the measurement. At the end of the delay, the device may check the other hardware again before acquiring the measurement from the sensor.