Corrected comments, only

pull/13/head
boblark 2 years ago
parent 8ac9b2f536
commit a27123ec64
  1. 6
      analyze_fft4096_iq_F32.cpp
  2. 6
      analyze_fft4096_iq_F32.h

@ -70,7 +70,7 @@ static void apply_window_to_fft_buffer1(void *fft_buffer, const void *window) {
void AudioAnalyzeFFT4096_IQ_F32::update(void) {
audio_block_f32_t *block_i,*block_q;
int ii;
// uint32_t tt = micros(); // timing
block_i = receiveReadOnly_f32(0);
if (!block_i) return;
block_q = receiveReadOnly_f32(1);
@ -79,7 +79,6 @@ void AudioAnalyzeFFT4096_IQ_F32::update(void) {
return;
}
// Here with two new blocks of data
switch (state) {
case 0:
blocklist_i[0] = block_i; blocklist_q[0] = block_q;
@ -283,7 +282,7 @@ void AudioAnalyzeFFT4096_IQ_F32::update(void) {
case 31:
blocklist_i[31] = block_i; blocklist_q[31] = block_q;
// This state==31 takes about 500 uSec, including the FFT.
// This state==31 takes about 500 uSec, including the FFT.
copy_to_fft_buffer1(fft_buffer+0x000, blocklist_i[0]->data, blocklist_q[0]->data);
copy_to_fft_buffer1(fft_buffer+0x100, blocklist_i[1]->data, blocklist_q[1]->data);
copy_to_fft_buffer1(fft_buffer+0x200, blocklist_i[2]->data, blocklist_q[2]->data);
@ -378,5 +377,6 @@ void AudioAnalyzeFFT4096_IQ_F32::update(void) {
state = 16;
break; // From case 31
} // End of switch & case 31
// Serial.println(micros() - tt);
} // End update()
#endif

@ -73,11 +73,13 @@
* If xAxis=0 f=fs/2 in middle, f=0 on right edge
* If xAxis=1 f=fs/2 in middle, f=0 on left edge
* If xAxis=2 f=fs/2 on left edge, f=0 in middle
* If xAxis=3 f=fs/2 on right edgr, f=0 in middle
* If xAxis=3 f=fs/2 on right edge, f=0 in middle
* If there is 180 degree phase shift to I or Q these all get reversed.
*
* Timing, max is longest update() time:
* T4.0 Windowed, dBFS Out, 987 uSec
* T4.0 Windowed, dBFS Out, 701 uSec
* Averaged over all updates this is 4.3% processor load
* or less, depending on averaging.
*
* Scaling:
* Full scale for floating point DSP is a nebulous concept. Normally the

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