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uncrustify libraries/Filter/LowPassFilter.h

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uncrustify 2012-08-16 23:22:11 -07:00 committed by Pat Hickey
parent c284fb144f
commit 406abb3fa0
1 changed files with 37 additions and 33 deletions
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70
libraries/Filter/LowPassFilter.h
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@ -17,27 +17,31 @@
#include <inttypes.h>
#include <Filter.h>
// 1st parameter <T> is the type of data being filtered.
// 1st parameter <T> is the type of data being filtered.
template <class T>
class LowPassFilter : public Filter<T>
{
public:
// constructor
LowPassFilter(float gain);
public:
// constructor
LowPassFilter(float gain);
// apply - Add a new raw value to the filter, retrieve the filtered result
virtual T apply(T sample);
// apply - Add a new raw value to the filter, retrieve the filtered result
virtual T apply(T sample);
// reset - clear the filter - next sample added will become the new base value
virtual void reset() { _base_value_set = false; };
// reset - clear the filter - next sample added will become the new base value
virtual void reset() {
_base_value_set = false;
};
// reset - clear the filter and provide the new base value
virtual void reset( T new_base_value ) { _base_value = new_base_value; _base_value_set = true;};
// reset - clear the filter and provide the new base value
virtual void reset( T new_base_value ) {
_base_value = new_base_value; _base_value_set = true;
};
private:
float _gain; // gain value (like 0.02) applied to each new value
bool _base_value_set; // true if the base value has been set
float _base_value; // the number of samples in the filter, maxes out at size of the filter
private:
float _gain; // gain value (like 0.02) applied to each new value
bool _base_value_set; // true if the base value has been set
float _base_value; // the number of samples in the filter, maxes out at size of the filter
};
// Typedef for convenience (1st argument is the data type, 2nd is a larger datatype to handle overflows, 3rd is buffer size)
@ -56,34 +60,34 @@ typedef LowPassFilter<float> LowPassFilterFloat;
template <class T>
LowPassFilter<T>::LowPassFilter(float gain) :
Filter<T>(),
_gain(gain),
_base_value_set(false)
Filter<T>(),
_gain(gain),
_base_value_set(false)
{
// bounds checking on _gain
if( _gain > 1.0) {
_gain = 1.0;
}else if( _gain < 0.0 ) {
_gain = 0.0;
}
// bounds checking on _gain
if( _gain > 1.0) {
_gain = 1.0;
}else if( _gain < 0.0 ) {
_gain = 0.0;
}
};
// Public Methods //////////////////////////////////////////////////////////////
template <class T>
T LowPassFilter<T>::apply(T sample)
T LowPassFilter<T>:: apply(T sample)
{
// initailise _base_value if required
if( ! _base_value_set ) {
_base_value = sample;
_base_value_set = true;
}
// initailise _base_value if required
if( !_base_value_set ) {
_base_value = sample;
_base_value_set = true;
}
// do the filtering
_base_value = _gain * (float)sample + (1.0 - _gain) * _base_value;
// do the filtering
_base_value = _gain * (float)sample + (1.0 - _gain) * _base_value;
// return the value. Should be no need to check limits
return (T)_base_value;
// return the value. Should be no need to check limits
return (T)_base_value;
}
#endif