X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FAutopilot%2Fdigitalfilter.cxx;h=26377e13141b289635ca871e4103579e0b5c66fb;hb=ff91fec1bb4b59dc2a7084de2a5ab0469abb1f3e;hp=d73a2585e150d062bc87a70e8042148cb424a26c;hpb=f6c3a41b92f1e40749dfcd3b1afac5013ecaf719;p=flightgear.git

diff --git a/src/Autopilot/digitalfilter.cxx b/src/Autopilot/digitalfilter.cxx
index d73a2585e..26377e131 100644
--- a/src/Autopilot/digitalfilter.cxx
+++ b/src/Autopilot/digitalfilter.cxx
@@ -40,6 +40,7 @@ class DigitalFilterImplementation : public SGReferenced {
 protected:
   virtual bool configure( const std::string & nodeName, SGPropertyNode_ptr configNode) = 0;
 public:
+  virtual ~DigitalFilterImplementation() {}
   DigitalFilterImplementation();
   virtual void   initialize( double output ) {}
   virtual double compute( double dt, double input ) = 0;
@@ -251,7 +252,7 @@ void NoiseSpikeFilterImplementation::initialize( double output )
 double NoiseSpikeFilterImplementation::compute(  double dt, double input )
 {
   double delta = input - _output_1;
-  if( delta == 0.0 ) return input; // trivial
+  if( fabs(delta) <= SGLimitsd::min() ) return input; // trivial
 
   double maxChange = _rateOfChangeInput.get_value() * dt;
   const PeriodicalValue * periodical = _digitalFilter->getPeriodicalValue();