From fc39af08a1d6673aa727a84b17afd6c4485dff19 Mon Sep 17 00:00:00 2001 From: Lorenz Meier Date: Sat, 5 Apr 2014 17:02:37 +0200 Subject: airspeed: Prevent the filter from overshooting into the negative airspeed range --- src/lib/mathlib/math/filter/LowPassFilter2p.cpp | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'src/lib/mathlib/math/filter/LowPassFilter2p.cpp') diff --git a/src/lib/mathlib/math/filter/LowPassFilter2p.cpp b/src/lib/mathlib/math/filter/LowPassFilter2p.cpp index 3699d9bce..6f640c9f9 100644 --- a/src/lib/mathlib/math/filter/LowPassFilter2p.cpp +++ b/src/lib/mathlib/math/filter/LowPassFilter2p.cpp @@ -69,7 +69,7 @@ float LowPassFilter2p::apply(float sample) // do the filtering float delay_element_0 = sample - _delay_element_1 * _a1 - _delay_element_2 * _a2; if (isnan(delay_element_0) || isinf(delay_element_0)) { - // don't allow bad values to propogate via the filter + // don't allow bad values to propagate via the filter delay_element_0 = sample; } float output = delay_element_0 * _b0 + _delay_element_1 * _b1 + _delay_element_2 * _b2; @@ -81,5 +81,10 @@ float LowPassFilter2p::apply(float sample) return output; } +float LowPassFilter2p::reset(float sample) { + _delay_element_1 = _delay_element_2 = sample; + return apply(sample); +} + } // namespace math -- cgit v1.2.3