Position Detection System Sampling Frequency Offset Correction
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Solution Overview
Problem
Existing position detection systems fail to precisely measure sound output positions due to differences in sampling frequencies between received signals, leading to inaccurate synchronization and position detection.
Innovation Solution
A position detection system comprising first and second sensors with processors that receive broadcasting radio waves and measured waveform signals, estimate and correct for offsets in sampling frequencies, and detect the position of an object based on corrected signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual leakage sound detectors are used to measure leakage sounds, then the ability to detect leakage position is improved, but the synchronization precision between detectors deteriorates due to sampling frequency differences
Solution Approach 1:
The patent applies parameter changes by detecting and correcting sampling frequency offsets between multiple sensors. The system measures the actual sampling frequencies of each sensor and calculates offset values, then uses these offsets to synchronize the timing information of leakage sound waves across all sensors, ensuring accurate position detection despite hardware variations
Solution Approach 2:
The system implements feedback by continuously monitoring the sampling frequency of each sensor and using this information to adjust the timing synchronization. The offset detection mechanism provides feedback about frequency deviations, allowing the system to dynamically correct synchronization issues and maintain reliable operation
2Device complexity
If sampling frequency differences between sensors are ignored, then the device complexity is reduced, but the position measurement precision deteriorates
Solution Approach 1:
The patent applies preliminary action by performing offset detection and correction before the actual position measurement process. The system pre-calculates the sampling frequency offsets for each sensor and stores this correction information, so that when leakage sounds are detected, the timing synchronization is already prepared and applied automatically without adding complex real-time processing
Data Source
AI summary
A position detection system, including a memory storing instructions, and at least one processor configured to process the instructions to receive measured waveform signals sent out from an object to be measured via a first sensor and a second sensor, receive the broadcasting radio wave signals sent out from the first sensor and the second sensor, separate the measured waveform signals and the broadcasting radio wave, for each sensor, estimate an offset between the sampling frequencies of the measured waveform signal of the first sensor and the measured waveform signal of the second sensor based on the broadcasting radio wave signals respectively sent out from the first sensor and the second sensor, correct the measured waveform signal sent out from the second sensor based on the estimated offset between the sampling frequencies, and detect a position of the object to be measured based on the measured waveform signal sent out from the first sensor and a signal obtained by correcting the measured waveform signal sent out from the second sensor.