spectrogram.hpp

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// toolboxes/signal/include/nk/signal/time_frequency/spectrogram.hpp
//
// Short-time Fourier transform. periodogram / pwelch (which collapse the
// time axis) live in spectral_analysis/periodogram_pwelch.hpp.
 
#pragma once
 
#include <memory_resource>
#include <nk/value/value.hpp>
 
#include <tuple>
 
namespace nk::signal {

 

std::tuple<Value, Value, Value>
spectrogram(const Value &                x,
            const Value &                window,
            size_t                       noverlap,
            size_t                       nfft,
            std::pmr::memory_resource *  mr = nullptr);

Value stft(const Value &                x,
           const Value &                window,
           std::size_t                  overlap,
           std::size_t                  fftLength,
           const std::string &          range,
           std::pmr::memory_resource *  mr = nullptr);

Value istft(const Value &                S,
            const Value &                window,
            std::size_t                  overlap,
            std::size_t                  fftLength,
            const std::string &          range,
            std::pmr::memory_resource *  mr = nullptr);

std::tuple<Value, Value, Value>
iscola(const Value &                window,
       std::size_t                  noverlap,
       const std::string &          method,
       std::pmr::memory_resource *  mr = nullptr);
 

} // namespace nk::signal