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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
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 97 additions and 19 deletions
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79
firmware/baseband/proc_capture.cpp
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@ -31,7 +31,8 @@ CaptureProcessor::CaptureProcessor() {
decim_0_8.configure(taps_200k_decim_0.taps, 33554432); // to be used with decim1 (/2), then total two stages decim (/16)
decim_0_8_180k.configure(taps_180k_wfm_decim_0.taps, 33554432); // to be used alone - no additional decim1 (/2), then total single stage decim (/8)
decim_1.configure(taps_200k_decim_1.taps, 131072);
decim_1_2.configure(taps_200k_decim_1.taps, 131072);
decim_1_8.configure(taps_16k0_decim_1.taps, 131072); // tentative decim1 /8 and taps, pending to be optimized.
channel_spectrum.set_decimation_factor(1);
baseband_thread.start();
@ -39,11 +40,16 @@ CaptureProcessor::CaptureProcessor() {
void CaptureProcessor::execute(const buffer_c8_t& buffer) {
/* 2.4576MHz, 2048 samples */
const auto decim_0_out = decim_0_execute(buffer, dst_buffer); // selectable 3 possible decim_0, (/4. /8 200k soft transition filter , /8 180k sharp )
const auto decim_0_out = decim_0_execute(buffer, dst_buffer); // selectable 3 possible decim_0, (/4. /8 200k soft filter , /8 180k sharp )
const auto decim_1_out = decim_1_execute(decim_0_out, dst_buffer); // selectable 3 possible decim_1, (/8. /2 200k or bypassed /1 )
/* this code was valid when we had only 2 decim1 cases.
const auto decim_1_out = baseband_fs < 4800'000
? decim_1.execute(decim_0_out, dst_buffer) // < 600khz double decim. stage , means 500khz and lower bit rates.
: decim_0_out; // >= 600khz single decim. stage , means 600khz and upper bit rates.
? decim_1_2.execute(decim_0_out, dst_buffer) // < 600khz double decim. stage , means 500khz and lower bit rates.
// ? decim_1_8.execute(decim_0_out, dst_buffer) // < 600khz double decim. stage , means 500khz and lower bit rates.
: decim_0_out; // >= 600khz single decim. stage , means 600khz and upper bit rates.
} */
const auto& decimator_out = decim_1_out;
const auto& channel = decimator_out;
@ -91,13 +97,44 @@ void CaptureProcessor::sample_rate_config(const SampleRateConfigMessage& message
baseband_thread.set_sampling_rate(baseband_fs);
// Current fw , we are using only 2 decim_0 modes, /4 , /8
auto decim_0_factor = oversample_rate == OversampleRate::x8
? decim_0_4.decimation_factor
: decim_0_8.decimation_factor;
size_t decim_0_output_fs = baseband_fs / decim_0_factor;
size_t decim_0_output_fs = baseband_fs / decim_0_factor;
size_t decim_1_input_fs = decim_0_output_fs;
size_t decim_1_output_fs = decim_1_input_fs / decim_1.decimation_factor;
size_t decim_1_factor;
switch (oversample_rate) { // we are using 3 decim_1 modes, /1 , /2 , /8
case OversampleRate::x8:
if (baseband_fs < 4800'000) {
decim_1_factor = decim_1_2.decimation_factor; // /8 = /4x2
} else {
decim_1_factor = 2 * 1; // 600khz and onwards, single decim /8 = /8x1 (we applied additional *2 correction to speed up waterfall, no effect to scale spectrum)
}
break;
case OversampleRate::x16:
decim_1_factor = 2 * decim_1_2.decimation_factor; // /16 = /8x2 (we applied additional *2 correction to increase waterfall spped >=600k and smooth & avoid abnormal motion >1M5 )
break;
case OversampleRate::x32:
decim_1_factor = 2 * decim_1_8.decimation_factor; // /x32 = /4x8 (we applied additional *2 correction to speed up waterfall, no effect to scale spectrum)
break;
default:
decim_1_factor = 2; // just default initial value to remove compile warning.
break;
}
/*
auto decim_1_factor = oversample_rate == OversampleRate::x32 // that was ok, when we had only 2 oversampling x8 , x16
? decim_1_8.decimation_factor
: decim_1_2.decimation_factor;
*/
size_t decim_1_output_fs = decim_1_input_fs / decim_1_factor;
channel_filter_low_f = taps_200k_decim_1.low_frequency_normalized * decim_1_input_fs;
channel_filter_high_f = taps_200k_decim_1.high_frequency_normalized * decim_1_input_fs;
@ -117,15 +154,39 @@ void CaptureProcessor::capture_config(const CaptureConfigMessage& message) {
buffer_c16_t CaptureProcessor::decim_0_execute(const buffer_c8_t& src, const buffer_c16_t& dst) {
switch (oversample_rate) {
case OversampleRate::x8: // we can get /8 by two means , decim0 (:4) + decim1 (:2) . or just decim0 (;8)
case OversampleRate::x8: // we can get /8 by two means , decim0 (/4) + decim1 (/2) . or just decim0 (/8)
if (baseband_fs < 4800'000) { // 600khz (600k x 8)
return decim_0_4.execute(src, dst); // decim_0 /4 with double decim stage
return decim_0_4.execute(src, dst); // decim_0 , /4 with double decim stage
} else {
return decim_0_8_180k.execute(src, dst); // decim_0 /8 with single decim stage
}
case OversampleRate::x16:
return decim_0_8.execute(src, dst);
return decim_0_8.execute(src, dst); // decim_0 , /8 with double decim stage
case OversampleRate::x32:
return decim_0_4.execute(src, dst); // decim_0 , /4 with double decim stage
default:
chDbgPanic("Unhandled OversampleRate");
return {};
}
}
buffer_c16_t CaptureProcessor::decim_1_execute(const buffer_c16_t& src, const buffer_c16_t& dst) {
switch (oversample_rate) {
case OversampleRate::x8: // we can get /8 by two means , decim0 (/4) + decim1 (/2) . or just decim0 (/8)
if (baseband_fs < 4800'000) { // 600khz (600k x 8)
return decim_1_2.execute(src, dst);
} else {
return src;
}
case OversampleRate::x16:
return decim_1_2.execute(src, dst); // total decim /16 = /8x2, applied to 150khz
case OversampleRate::x32:
return decim_1_8.execute(src, dst); // total decim /32 = /4x8, appled to <= 100khz , 75k with margin ,(50k, 25k, 12k5 now also) ...
default:
chDbgPanic("Unhandled OversampleRate");