/**
* Creates a resampler using a FIR low pass filter and the given up- and down-sample factors.
* The filter must be appropriate for the given factors. Internally the up- and down-factors are
* divided by their greatest common divisor to increase efficiency.
*
* @param filter FIR filter
* @param upFactor upsample factor
* @param downFactor downsample factor
*/
public Resampler(final Filters.FIRFilter filter, final int upFactor, final int downFactor) {
this(filter.getCoefficients(), upFactor, downFactor);
}
/**
* Creates a decimator with the given FIR (low pass) filter.
*
* @param filter FIR filter
* @param factor nth frame to keep (factor)
*/
public Decimator(final Filters.FIRFilter filter, final int factor) {
super(filter.getCoefficients());
this.factor = factor;
}
/**
* Creates an interpolator with the given FIR filter for filtering after upsampling to avoid
* aliasing. It's recommended to use a filter with a multiple of the upsample factor as the
* number of coefficients (taps). If that's not the case, zeros are added to the filter's
* coefficients.
*
* @param filter FIR filter
* @param factor upsample factor
*/
public Interpolator(final Filters.FIRFilter filter, final int factor) {
this(filter.getCoefficients(), factor);
}
