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betaflight_processing
This repository contains only processing charts based on latest Betaflight (4.3) version
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you really want to know the actual code it's all available on the betaflight github repository. https://github.com/betaflight/betaflight I'm out of my depth trying to understand or explain the actual code, but it's all there. u/moralbound's explanation is as good a summary for an end user as you'll get.
This is a nice chart by mrRobot62 on github how signal processing in betaflight v4.2 works: https://github.com/mrRobot62/betaflight_processing/blob/master/bf-4.2_processing-workflow.png?raw=true