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/*

Numerically controlled oscillator

Copyright 2019 Ahmet Inan <inan@aicodix.de>

*/

#include "unit_circle.hh"

#pragma once

namespace DSP {

template <typename TYPE>

class Phasor

{

typedef TYPE complex_type;

typedef typename complex_type::value_type value_type;

complex_type prev, delta;

public:

constexpr Phasor() : prev(1, 0), delta(1, 0)

{

}

void omega(int n, int N)

{

delta = complex_type(

UnitCircle<value_type>::cos(n, N),

UnitCircle<value_type>::sin(n, N));

}

void omega(value_type v)

{

delta = complex_type(cos(v), sin(v));

}

void freq(value_type v)

{

omega(Const<value_type>::TwoPi() * v);

}

void reset()

{

prev = complex_type(1, 0);

}

complex_type operator()()

{

complex_type tmp = prev;

prev *= delta;

prev /= abs(prev);

return tmp;

}

};

}