Multi-rate Digital Sensor Synchronization via Preliminary Resampling
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Solution Overview
Problem
Digital sensor data processing algorithms often suffer from latency and desynchronization issues when the sensor data sample rate differs from the processing algorithm's sample rate, leading to degraded performance, particularly in applications like active noise cancellation (ANC) that require low latency.
Innovation Solution
A multi-rate synchronization method is implemented, where the digital sensor operates at a first sample rate and the processor at a second sample rate, which is an integer multiple of the first, using synchronization markers and re-sampling techniques to align data without asynchronous conversion, thereby reducing latency and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the processor operates at a different sample rate than the sensor, then processing flexibility is improved, but synchronization complexity and latency increase
Solution Approach 1:
The system performs preliminary resampling of sensor data to the processor's sample rate before processing begins. A resampler is configured to convert sensor data from the sensor's native sample rate to the processor's sample rate in advance, eliminating the need for complex real-time synchronization mechanisms and reducing processing latency.
2Productivity
If asynchronous processing is used between sensor and processor, then processing independence is improved, but data alignment accuracy deteriorates
Solution Approach 1:
The resampler acts as an intermediary component between the sensor and processor. It receives data from the sensor at its native sample rate and outputs resampled data at the processor's sample rate, enabling asynchronous operation while maintaining precise data alignment through controlled resampling rather than direct asynchronous connection.
3Adaptability or versatility
If sample rate conversion is performed asynchronously, then processing flexibility is improved, but latency increases
Solution Approach 1:
The system performs preliminary resampling of sensor data to the processor's sample rate before processing begins. A resampler is configured to convert sensor data from the sensor's native sample rate to the processor's sample rate in advance, eliminating the need for complex real-time synchronization mechanisms and reducing processing latency.
Data Source
AI summary
A system and method for multi-rate synchronization of a digital sensor that provides a digital sensor output signal and a processor arrangement that processes the digital sensor output signal according to a processing algorithm and that provides a processor output signal, including operating the digital sensor to provide the digital sensor output signal with a first sample rate, and operating the processor arrangement to provide a processor output signal with a second sample rate. The second sample rate is an integer multiple of the first sample rate.