9 Commits

Author	SHA1	Message	Date
furrtek	b813b32593	Added an audio FFT view in Wideband FM receive ... Tried speeding up fill_rectangle for clearing the waveform widget	2018-05-21 18:46:48 +01:00
Jared Boone	dfbcf5bc75	Extract some constexpr math utilities to utility.hpp ... ...my dumping ground for so many random bits.	2016-02-10 10:15:42 -08:00
Jared Boone	5547782f5a	Improve FFT twiddle factor precisions using Python SymPy. ... Python math, numpy, scipy produce values with significant rounding errors.	2016-01-03 21:02:44 -08:00
Jared Boone	963b6e257a	FFT twiddles can be used for all K <= table length. ... Change assert to allow FFTs < 8.	2016-01-03 20:25:31 -08:00
Jared Boone	54e59cc224	Hard-code K=8 FFT twiddle constants for now. ... So low on baseband RAM! This eliminates the sin_f32() function and table, which is only used in the FFT, for the moment.	2016-01-03 20:08:26 -08:00
Jared Boone	65dd385c94	Little FFT loop indexing tweak.	2016-01-03 17:47:08 -08:00
Jared Boone	b41ff962f4	Replace std::sin() with interpolated LUT.	2015-10-14 11:10:24 -07:00
Jared Boone	882fbbef31	Add more fft_swap bit reversal functions.	2015-10-14 11:10:24 -07:00
Jared Boone	dc6fee8370	Initial firmware commit.	2015-07-08 08:39:24 -07:00