partial revert of 74d9f5e31428ef362033a63c10b781d943c5e5a5

We actually need to use a float intermediate type lest the value gets
truncated.

2 files changed, 2 insertions, 2 deletions

diff --git a/filter-ewma2/ftnoir_filter_ewma2.cpp b/filter-ewma2/ftnoir_filter_ewma2.cpp
index 6f9e428c..bf4b1083 100644
--- a/filter-ewma2/ftnoir_filter_ewma2.cpp
+++ b/filter-ewma2/ftnoir_filter_ewma2.cpp
@@ -49,7 +49,7 @@ void FTNoIR_Filter::filter(const double *input, double *output)
         }
     }
     // Get the time in seconds since last run and restart the timer.
-    const double dt = timer.restart() / 1000;
+    const double dt = timer.restart() / 1000.;
     // Calculate delta_alpha and noise_alpha from dt.
     double delta_alpha = dt/(dt + delta_RC);
     double noise_alpha = dt/(dt + noise_RC);
diff --git a/filter-kalman/kalman.cpp b/filter-kalman/kalman.cpp
index 0e7537d1..5af548ed 100644
--- a/filter-kalman/kalman.cpp
+++ b/filter-kalman/kalman.cpp
@@ -80,7 +80,7 @@ void FTNoIR_Filter::filter(const double* input, double *output)
     if (!timer.isValid())
         timer.start();
     // Get the time in seconds since last run and restart the timer.
-    const double dt = timer.restart() / 1000;
+    const double dt = timer.restart() / 1000.;
     // Note this is a terrible way to detect when there is a new
     // frame of tracker input, but it is the best we have.
     bool new_input = false;