// Tests the filter factor setter
TEST(HighPassFilter, TestCutoffFrequencySet) {
HighPassFilter hpf;
//Check the id's matches
EXPECT_TRUE( hpf.getId() == HighPassFilter::getId() );
const Float delta = 1.0 / 500.0f; //Set a delta for 500Hz
//Set the gain with a valid value
EXPECT_TRUE( hpf.setCutoffFrequency( 10, delta ) );
EXPECT_EQ( hpf.getFilterFactor(), GET_FILTER_FACTOR( 10.0, delta ) );
//Set the gain with a non valid value
EXPECT_FALSE( hpf.setCutoffFrequency( -1, delta ) );
EXPECT_EQ( hpf.getFilterFactor(), GET_FILTER_FACTOR( 10.0, delta ) ); //The gain should not have changed
//Set the gain with a non valid value
EXPECT_FALSE( hpf.setCutoffFrequency( 0, delta ) );
EXPECT_EQ( hpf.getFilterFactor(), GET_FILTER_FACTOR( 10.0, delta ) ); //The gain should not have changed
//Set the gain with a non valid value
EXPECT_FALSE( hpf.setCutoffFrequency( 10, 0 ) );
EXPECT_EQ( hpf.getFilterFactor(), GET_FILTER_FACTOR( 10.0, delta ) ); //The gain should not have changed
}
// Tests the save/load functions
TEST(HighPassFilter, TestSaveLoad) {
HighPassFilter hpf;
//Check the id's matches
EXPECT_TRUE( hpf.getId() == HighPassFilter::getId() );
const Float delta = 1.0 / 500.0f; //Set a delta for 500Hz
//Set the gain with a valid value
EXPECT_TRUE( hpf.setCutoffFrequency( 10, delta ) );
EXPECT_EQ( hpf.getFilterFactor(), GET_FILTER_FACTOR( 10.0, delta ) );
EXPECT_TRUE( hpf.save("hpf_unit_test_model.grt") );
EXPECT_TRUE( hpf.clear() );
EXPECT_TRUE( hpf.load("hpf_unit_test_model.grt") );
EXPECT_EQ( ROUND( hpf.getFilterFactor() ), ROUND( GET_FILTER_FACTOR( 10.0, delta ) ) ); //Due to differences in how things are load from the file, we need to round the expected value
}
int main (int argc, const char * argv[])
{
//Create a new instance of a high pass filter, using the default constructor
HighPassFilter hpf;
//Set the cutoff frequency of the filter to 2.0Hz
hpf.setCutoffFrequency( 2, 1.0/1000.0);
//Create some varaibles to help generate the signal data
const UINT numSeconds = 60; //The number of seconds of data we want to generate
double t = 0; //This keeps track of the time
double tStep = 1.0/1000.0; //This is how much the time will be updated at each iteration in the for loop
double freq = 0; //Stores the frequency
map< UINT, double > freqRates; //Holds the frequency rates
map< UINT, double >::iterator iter; //An iterator for the frequency rates map
//Add the freq rates
//The first value is the time in seconds and the second value is the frequency that should be set at that time
freqRates[ 0 ] = 0.1;
freqRates[ 10 ] = 0.5;
freqRates[ 20 ] = 1;
freqRates[ 30 ] = 2;
freqRates[ 40 ] = 4;
freqRates[ 50 ] = 8;
//Create and open a file to save the data
fstream file;
file.open("HighPassFilterData.txt", iostream::out);
//Generate the signal and filter the data
for(UINT i=0; i<numSeconds*1000; i++){
//Check to see if we should update the freq rate to the next value
iter = freqRates.find( i/1000 );
if( iter != freqRates.end() ){
//Set the new frequency value
freq = iter->second;
}
//Generate the signal
double signal = sin( t * TWO_PI*freq );
//Filter the signal
double filteredValue = hpf.filter( signal );
//Write the signal and the filtered data to the file
file << signal << "\t" << filteredValue << endl;
//Update the t
t += tStep;
}
//Close the file
file.close();
//Save the HighPassFilter settings to a file
hpf.saveSettingsToFile("HighPassFilterSettings.txt");
//We can then load the settings later if needed
hpf.loadSettingsFromFile("HighPassFilterSettings.txt");
return EXIT_SUCCESS;
}