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Solve_quality_problem_low_bit_rate_100k_150k_REC_Capture_App (#1367)

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* Solve_low_bit_rate_150k_Capture_App

* Applying  review comments.

* format issues

* Adding back requested previous low bit rates
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Brumi-2021 2023-08-12 16:20:15 +02:00 • committed by GitHub
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7 changed files with 17 additions and 9 deletions
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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 ... 2'000'000: // BW Captured range (0 <= 250kHz max) fs = 8 x 250 kHz.
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
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