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42 lines
677 B
C++
42 lines
677 B
C++
/*
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Numerically controlled oscillator
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Copyright 2019 Ahmet Inan <inan@aicodix.de>
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*/
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#include "unit_circle.hh"
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#pragma once
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namespace DSP {
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template <typename TYPE>
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class Phasor
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{
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typedef TYPE complex_type;
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typedef typename complex_type::value_type value_type;
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complex_type prev, delta;
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public:
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constexpr Phasor() : prev(1, 0), delta(1, 0)
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{
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}
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void omega(int n, int N)
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{
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delta = complex_type(
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UnitCircle<value_type>::cos(n, N),
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UnitCircle<value_type>::sin(n, N));
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}
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void omega(value_type v)
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{
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delta = complex_type(cos(v), sin(v));
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}
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complex_type operator()()
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{
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complex_type tmp = prev;
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prev *= delta;
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prev /= abs(prev);
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return tmp;
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}
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};
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}
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