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Increase REC BW Option till 1Mhz Capture App (#1352)

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* Increase REC BW Option till 1Mhz Capture App

* Format issues

* miss type correction

* format issues
This commit is contained in:
Brumi-2021
2023-08-06 21:54:24 +02:00
committed by GitHub
parent 1188157a3e
commit cb0a4854f5
5 changed files with 36 additions and 20 deletions
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22
firmware/baseband/proc_capture.cpp
View File

@@ -27,8 +27,10 @@
#include "utility.hpp"
CaptureProcessor::CaptureProcessor() {
decim_0_4.configure(taps_200k_decim_0.taps, 33554432);
decim_0_8.configure(taps_200k_decim_0.taps, 33554432);
decim_0_4.configure(taps_200k_decim_0.taps, 33554432); // to be used with decim1 (/2), then total two stages decim (/8)
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);
channel_spectrum.set_decimation_factor(1);
@@ -37,8 +39,12 @@ 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);
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
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_1_out = baseband_fs < 4800'000
? decim_1.execute(decim_0_out, dst_buffer) // < 500khz double decim. stage
: decim_0_out; // > 500khz single decim. stage
const auto& decimator_out = decim_1_out;
const auto& channel = decimator_out;
@@ -111,8 +117,12 @@ 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:
return decim_0_4.execute(src, dst);
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
} 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);

3
firmware/baseband/proc_capture.hpp
View File

@@ -56,8 +56,9 @@ class CaptureProcessor : public BasebandProcessor {
* use decim_0_8 for an overall decimation factor of 16. */
dsp::decimate::FIRC8xR16x24FS4Decim4 decim_0_4{};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0_8{};
dsp::decimate::FIRC8xR16x24FS4Decim8 decim_0_8_180k{};
dsp::decimate::FIRC16xR16x16Decim2 decim_1{};
int32_t channel_filter_low_f = 0;
int32_t channel_filter_high_f = 0;
int32_t channel_filter_transition = 0;