RPM filter
The RPM filter uses bidirectional-DShot motor RPM telemetry to place precise notches on each motor's rotational harmonics, removing motor noise at the source.
It's the most effective motor-noise filter because it targets the exact harmonics rather than a broad band, letting you run less gyro/D-term lowpass and therefore lower latency. PIDoctor verifies your RPM filter is active and effective and recommends rpm_filter settings.