plotwave.ipynb

wavegen.cc

#include <complex>
#include <vector>
#include <string>
#include <fstream>
#include <algorithm>
#include <iostream>

constexpr double PI = 3.1415926535897;

template <typename T>
class wave_table_t {
public:
  wave_table_t(const std::string &wave_type, size_t len, const T ampl)
    : _wave_table(len) {
    if (wave_type == "SINE") {
      static T tau = 2 * PI;
      static const std::complex<T> J(0, 1);

      for (size_t I = 0; I < len; ++I) {
	_wave_table[I] = ampl * std::exp(J * static_cast<T>(tau * I / len));
      }

      _power_dbfs = static_cast<T>(20 * std::log10(ampl));
    }
  }

  void dump_to_file(const std::string &filename) const {
    std::ofstream ofile(filename.c_str(), std::ofstream::binary);
    ofile.write((char *)&_wave_table[0], _wave_table.size() * sizeof(std::complex<T>));
    ofile.close();
  }
private:
  T _power_dbfs;
  std::vector<std::complex<T>> _wave_table;
};

int main() {
  wave_table_t<float> wt("SINE", 1024, 1.0);
  wt.dump_to_file("/tmp/mysine.data");
}