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iir.ino
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iir.ino
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/*This is a signal sum of 800 hz and 3.2 khz sine waves
which sampled in 10khz and 32 of this samples are
create a data array.(input signal)
In this example input signal is filtered with
8 points iir filter. Filter is designed as low pass filter
and filter coeficient calculated at Octave
more info https://github.com/mozanunal/SimpleDSP/wiki/IIR
*/
extern "C" {
#include "simpleDSP_iir.h"
}
float coefB[4] =
{
0.049533,
0.1486,
0.1486,
0.049533};
float coefA[4] =
{
1,
-1.1619,
0.69594,
-0.13776};
int input[255] =
{
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03,
-115.808,
-866.986,
-1567.2,
541.587,
618.034,
-263.146,
1504.41,
1504.41,
-263.146,
618.034,
541.587,
-1567.2,
-866.986,
-115.808,
-1618.03,
-613.161,
1031.37,
-101.597,
450.527,
2000,
450.527,
-101.597,
1031.37,
-613.161,
-1618.03};
IIR iir1;
long startTime;
long calcTime;
void setup()
{
Serial.begin(9600);
iirInit(&iir1, 4, coefB, 4, coefA);
Serial.println("IIR filter initiliaze finished");
float a;
startTime = micros();
for (int i = 0; i < 255; i++)
{
a = iirFilt(&iir1, input[i]);
}
calcTime = micros() - startTime;
Serial.print("Total calculation time: ");
Serial.println(calcTime);
}
void loop()
{
}