/**
* Find the appropriate filter for the given up/down compbination.
*
* @param upFactor up sampling factor
* @param downFactor down sampling factor
* @return filter
*/
private static Filters.FIRFilter createFilter(final int upFactor, final int downFactor) {
final int gcd = greatestCommonDivisor(upFactor, downFactor);
return Filters.createFir1_16thOrderLowpass(Math.max(upFactor / gcd, downFactor / gcd));
}
/**
* Creates a decimator using a simple fir1 16th order low pass filter.
*
* @param factor nth frame to keep (factor)
* @throws IllegalArgumentException if the decimation factor is not supported
* @see Filters#createFir1_16thOrderLowpass(int)
*/
public Decimator(final int factor) throws IllegalArgumentException {
super(Filters.createFir1_16thOrderLowpass(factor).getCoefficients());
this.factor = factor;
}
/**
* Creates an interpolator using a simple fir1 16th order low pass filter.
*
* @param factor upsample factor
* @throws IllegalArgumentException if the upsample factor is not supported
* @see Filters#createFir1_16thOrderLowpass(int)
*/
public Interpolator(final int factor) {
this(Filters.createFir1_16thOrderLowpass(factor).getCoefficients(), factor);
}
