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Extend REC low bit rate bandwith options in Capture App till 75khz (#1380)

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* working_x32_Capture_till_75Khz

* format issues

* apply better accurate comments

* auto format issues
This commit is contained in:
Brumi-2021
2023-08-16 23:26:59 +02:00
committed by GitHub
parent e1cc0b1ad0
commit 12dbf957b3
6 changed files with 97 additions and 19 deletions
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2
firmware/application/ui/ui_spectrum.cpp
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@@ -383,7 +383,7 @@ void WaterfallView::on_audio_spectrum() {
// TODO: Comments below refer to a fixed oversample rate (8x), cleanup.
uint32_t filter_bandwidth_for_sampling_rate(int32_t sampling_rate) {
switch (sampling_rate) { // Use the var fs (sampling_rate) to set up BPF aprox < fs_max / 2 by Nyquist theorem.
case 0 ... 3'000'000: // BW Captured range (0 <= 250kHz max) fs = 8 x 250 kHz., 16 x 150 khz, 32 x 75 khz, , 64 x 40 khz
case 0 ... 3'500'000: // BW Captured range (0 <= 250kHz max) fs = 8x250 kHz =2000., 16x150 khz =2400, 32x100 khz =3200, (32x75k = 2400), (future 64x40 khz =2400)
return 1'750'000; // Minimum BPF MAX2837 for all those lower BW options.
case 4'000'000 ... 6'000'000: // BW capture range (500k...750kHz max) fs_max = 8 x 750kHz = 6Mhz