signal/include/nk/signal/convolution/extras.hpp

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// toolboxes/signal/include/nk/signal/convolution/extras.hpp
//
// Convolution / correlation extras (E1):
//   cconv(x, y[, n])           — circular convolution
//   convmtx(h, n)              — convolution matrix
//   xcorr2(A, B)               — 2-D cross-correlation
//   finddelay(x, y[, max])     — lag of max(xcorr(x, y))
//   alignsignals(x, y[, max])  — align two signals by zero-padding
 
#pragma once
 
#include <memory_resource>
#include <nk/value/value.hpp>
 
#include <tuple>
 
namespace nk::signal {

 

Value cconv(const Value &                x,
            const Value &                y,
            size_t                       n  = 0,
            std::pmr::memory_resource *  mr = nullptr);

Value convmtx(const Value &                h,
              size_t                       n,
              std::pmr::memory_resource *  mr = nullptr);

Value xcorr2(const Value &                A,
             const Value &                B,
             std::pmr::memory_resource *  mr = nullptr);

long finddelay(const Value &                x,
               const Value &                y,
               long                         max_lag = 0,
               std::pmr::memory_resource *  mr      = nullptr);

std::tuple<Value, Value>
alignsignals(const Value &                x,
             const Value &                y,
             long                         max_lag = 0,
             std::pmr::memory_resource *  mr      = nullptr);
 

} // namespace nk::signal