how to use the filter library in arduino..need some help

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1

Hi. i have arduino filter library installed in my IDE software...i want to use low pass filter with cutoff frequncy Fc = 9 HZ ...also there is no butterworth filter ... so i will use Chebychev....but how to set the Fc and the bandwidth of filter ..need some help pls

the example code

#include <SignalFilter.h>

SignalFilter Filter;

int value;
int filtered;

void setup()
{
  Serial.begin(9600);
  Filter.begin();
  Filter.setFilter('c');
  Filter.setOrder(1);
}

void loop()
{
  value = analogRead(A0);
  filtered= Filter.run(value);
  Serial.print("In: ");
  Serial.print(value);
  Serial.print(" - Out: ");
  Serial.println(filtered);
  delay(500);                                     //make it readable
}
2

the source of the library is

3

this error occured when i run the code....?

Chebychev:3: error: 'SignalFilter' does not name a type
Chebychev.ino: In function 'void setup()':
Chebychev:11: error: 'Filter' was not declared in this scope
Chebychev.ino: In function 'void loop()':
Chebychev:19: error: 'Filter' was not declared in this scope