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@ -1,5 +1,5 @@ |
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/*
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* analyze_fft4096_iqem_F32.h Assembled by Bob Larkin 9 Mar 2021 |
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* analyze_fft4096_iqem_F32.h Assembled by Bob Larkin 18 Feb 2022 |
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* |
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* External Memory **** BETA TEST VERSION - NOT FULLY TESTED **** <<<<<<<<<< |
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* |
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@ -20,7 +20,7 @@ |
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* * Multiple bin-sum output to simulate wider bins. |
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* * Power averaging of multiple FFT |
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* |
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* Conversion Copyright (c) 2021 Bob Larkin |
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* Conversion Copyright (c) 2022 Bob Larkin |
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* Same MIT license as PJRC: |
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* |
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* From original real FFT: |
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@ -90,17 +90,23 @@ |
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* |
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* x-Axis direction and offset per setXAxis(xAxis) for sine to I |
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* and cosine to Q: |
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* If xAxis=0 f=0 in middle, f=fs/2 on left edge |
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* If xAxis=1 f=0 in middle, f=fs/2 on right edge |
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* If xAxis=2 f=0 on right edge, f=fs/2 in middle |
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* If xAxis=3 f=0 on left edge, f=fs/2 in middle |
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* |
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* If xAxis=0 f=fs/2 in middle, f=0 on right edge |
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* If xAxis=1 f=fs/2 in middle, f=0 on left edge |
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* If xAxis=2 f=fs/2 on left edge, f=0 in middle |
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* If xAxis=3 f=fs/2 on right edgr, f=0 in middle |
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* |
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* If there is 180 degree phase shift to I or Q these all get reversed. |
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* xAxis=1 is a mathemetically consistent method. It has positive frequencies |
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* on the right and negative ones on the left. The center is half the sample |
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* rate, both + and -. Uniormly sampled data lives in this circular world.rate. |
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* |
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* Timing, max is longest update() time: |
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* T4.0 Windowed, dBFS Out, 987 uSec <<<<<<CHECK |
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* Timing, maximum microseconds per update() over the 16 updates, |
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* and the average percent processor use for 44.1 kHz sample rate and Nave=1: |
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* T4.0 Windowed, dBFS Out (FFT_DBFS), 710 uSec, Ave 4.64% |
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* T4.0 Windowed, Power Out (FFT_POWER), 530 uSec, Ave 1.7% |
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* T4.0 Windowed, RMS Out, (FFT_RMS) 530 uSec, Ave 1.92% |
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* Nave greater than 1 decreases the average processor load. |
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* |
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* Windows: The FFT window array memory is provided by the INO. Three common and |
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* useful window functions, plus no window, can be filled into the array by calling |
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@ -131,6 +137,8 @@ |
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* removing 66.2 dB. With floating point, the dynamic range is maintained |
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* no matter how it is scaled, but this factor needs to be considered |
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* when building the INO. |
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* |
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* 22 Feb 2022 Fixed xAxis error. |
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*/ |
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/* Info
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* __MK20DX128__ T_LC; __MKL26Z64__ T3.0; __MK20DX256__T3.1 and T3.2 |
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@ -270,7 +278,7 @@ public: |
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// xAxis, bit 0 left/right; bit 1 low to high; default 0X03
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void setXAxis(uint8_t _xAxis) { |
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xAxis = _xAxis; |
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xAxis = _xAxis ^ 0X20; // Change bit 1 to be consistent with other IQ FFT
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} |
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virtual void update(void); |
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