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added FMD{1..5}, atan and atan2 approximations

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Ahmet Inan 2019-02-06 14:29:07 +01:00
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@ -44,6 +44,14 @@ The following [infinite impulse response](https://en.wikipedia.org/wiki/Infinite
[Numerically controlled oscillator](https://en.wikipedia.org/wiki/Numerically_controlled_oscillator) implemented using a [phasor](https://en.wikipedia.org/wiki/Phasor) and [complex multiplication](https://en.wikipedia.org/wiki/Complex_number#Multiplication) instead of a [lookup table](https://en.wikipedia.org/wiki/Lookup_table).
### [fmd.hh](fmd.hh)
[Frequency modulation](https://en.wikipedia.org/wiki/Frequency_modulation) [demodulation](https://en.wikipedia.org/wiki/Demodulation) with and without [atan2](https://en.wikipedia.org/wiki/Atan2).
### [atan2.hh](atan2.hh)
[atan](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) and [atan2](https://en.wikipedia.org/wiki/Atan2).
### [const.hh](const.hh)
Some constants we need