subband.h

#pragma once
 
#include <dsplib/array.h>
 
#include <cassert>
#include <memory>
 
namespace dsplib {
 
class ChannelizerImpl;
 
//TODO: use decim factor in matlab style (M/D)
 
class Channelizer
{
public:
    Channelizer(const Channelizer&) = delete;
 
    explicit Channelizer(span_real filter, int num_bands, int decim_factor);
 
    explicit Channelizer(std::shared_ptr<const arr_real> filter, int num_bands, int decim_factor);
 
    explicit Channelizer(int num_bands, int decim_factor, int num_taps);
 
    [[nodiscard]] arr_cmplx process(span_real x);
 
    arr_cmplx operator()(span_real x) {
        return this->process(x);
    }
 
    [[nodiscard]] int frame_len() const noexcept;
 
private:
    std::shared_ptr<ChannelizerImpl> d_;
};
 
class ChannelSynthesizerImpl;
 
class ChannelSynthesizer
{
public:
    ChannelSynthesizer(const ChannelSynthesizer&) = delete;
 
    explicit ChannelSynthesizer(span_real filter, int num_bands, int decim_factor);
 
    explicit ChannelSynthesizer(std::shared_ptr<const arr_real> filter, int num_bands, int decim_factor);
 
    explicit ChannelSynthesizer(int num_bands, int decim_factor, int num_taps);
 
    [[nodiscard]] arr_real process(span_cmplx x);
 
    arr_real operator()(span_cmplx x) {
        return this->process(x);
    }
 
    [[nodiscard]] int frame_len() const noexcept;
 
private:
    std::shared_ptr<ChannelSynthesizerImpl> d_;
};
 
}   // namespace dsplib