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#ifndef FILTER_SPLITTER_H
#define FILTER_SPLITTER_H
#include <cstddef>
/* Band splitter. Splits a signal into two phase-matching frequency bands. */
template<typename Real>
class BandSplitterR {
Real coeff{0.0f};
Real lp_z1{0.0f};
Real lp_z2{0.0f};
Real ap_z1{0.0f};
public:
BandSplitterR() = default;
BandSplitterR(const BandSplitterR&) = default;
BandSplitterR(Real f0norm) { init(f0norm); }
void init(Real f0norm);
void clear() noexcept { lp_z1 = lp_z2 = ap_z1 = 0.0f; }
void process(Real *hpout, Real *lpout, const Real *input, const size_t count);
void applyHfScale(Real *samples, const Real hfscale, const size_t count);
/* The all-pass portion of the band splitter. Applies the same phase shift
* without splitting the signal. Note that each use of this method is
* indepedent, it does not track history between calls.
*/
void applyAllpass(Real *samples, const size_t count) const;
};
using BandSplitter = BandSplitterR<float>;
#endif /* FILTER_SPLITTER_H */
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