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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
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GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 36 additions and 20 deletions
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7
firmware/application/freqman_db.cpp
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@ -82,10 +82,11 @@ options_t freqman_bandwidths[4] = {
{"100k", 100000},
{"250k", 250000},
{"500k", 500000}, /* Previous Limit bandwith Option with perfect micro SD write .C16 format operaton.*/
{"600k", 600000}, /* That extended option is still possible to record with FW version Mayhem v1.41 (< 2,5MB/sec) */
{"600k", 600000}, /* We doubled x2 previous REC BW limit , now extended BW from 600k to 1M with fast enough SD card in C16 or C8 format .*/
{"650k", 650000},
{"750k", 750000}, /* From this BW onwards, the LCD is ok, but the recorded file is decimated, (not real file size) */
{"1100k", 1100000},
{"750k", 750000},
{"1000k", 1000000}, /* New limit bandwith option for recording in C16 (in fast SD card) or in C8 */
{"1500k", 1500000}, /* From this BW onwards, the LCD is ok, but M4 CPU is having periodical sample rec dropps, (not real file size, accelerated replay) */
{"1750k", 1750000},
{"2000k", 2000000},
{"2500k", 2500000},

14
firmware/application/ui/ui_spectrum.cpp
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@ -390,19 +390,23 @@ uint32_t filter_bandwidth_for_sampling_rate(int32_t sampling_rate) {
// BW 500k...750kHz, ex. 500kHz (fs = 8 x BW = 4Mhz), BW 600kHz (fs = 4,8Mhz), BW 750 kHz (fs = 6Mhz).
return 2'500'000; // In some IC, MAX2837 appears as 2250000, but both work similarly.
case 8'800'000: // BW capture 1,1Mhz fs = 8 x 1,1Mhz = 8,8Mhz. (1Mhz showed slightly higher noise background).
return 3'500'000;
case 8'000'000: // BW capture 1Mhz fs = 8 x 1Mhz = 8Mhz. (1Mhz showed slightly higher noise background).
return 3'500'000; // some low SD cards, if not showing avg. writting speed >4MB/sec, they will produce sammples drop at REC with 1MB and C16 format.
case 12'000'000: // BW capture 1,5Mhz, fs = 8 x 1,5Mhz = 12Mhz
// Good BPF, good matching, we have some periodical M4 % samples drop.
return 5'000'000;
case 14'000'000: // BW capture 1,75Mhz, fs = 8 x 1,75Mhz = 14Mhz
// Good BPF, good matching, but LCD flickers, refresh rate should be < 20 Hz, reasonable picture.
// Good BPF, good matching, we have some periodical M4 % samples drop.
return 5'000'000;
case 16'000'000: // BW capture 2Mhz, fs = 8 x 2Mhz = 16Mhz
// Good BPF, good matching, but LCD flickers, refresh rate should be < 20 Hz, reasonable picture.
// Good BPF, good matching, we have some periodical M4 % samples drop.
return 6'000'000;
case 20'000'000: // BW capture 2,5Mhz, fs = 8 x 2,5 Mhz = 20Mhz
// Good BPF, good matching, but LCD flickers, refresh rate should be < 20 Hz, reasonable picture.
// Good BPF, good matching, we have some periodical M4 % samples drop.
return 7'000'000;
default: // BW capture 2,75Mhz, fs = 8 x 2,75Mhz = 22Mhz max ADC sampling and others.

10
firmware/application/ui_record_view.cpp
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@ -107,13 +107,13 @@ uint32_t RecordView::set_sampling_rate(uint32_t new_sampling_rate) {
auto oversample_rate = get_oversample_rate(new_sampling_rate);
auto actual_sampling_rate = new_sampling_rate * toUType(oversample_rate);
/* We are changing "REC" icon background to yellow in BW rec Options >600kHz
* where we are NOT recording full IQ .C16 files (recorded files are decimated ones).
* Those decimated recorded files, has not the full IQ samples.
* are ok as recorded spectrum indication, but they should not be used by Replay app.
/* We are changing "REC" icon background to yellow in BW rec Options >1Mhz
* > 1Mhz BW options , we are NOT recording full IQ .C16 files (those files has some periodical missing dropped samples).
* Those recorded files, has not the full IQ samples information, looks like decimated in file size.
* They are ok as recorded spectrum indication, but they should not be used by Replay app. (the voice speed will be accelerated)
* We keep original black background in all the correct IQ .C16 files BW's Options. */
if (actual_sampling_rate > 4'800'000) { // > BW >600kHz (fs=8*BW), (750kHz...2750kHz)
if (actual_sampling_rate > 8'000'000) { // Till fw 1.7.4 BW limit yellow REC button was >500khz, now BW >1Mhz (fs=8*BW), (>1Mhz ..2M75)
button_record.set_background(ui::Color::yellow());
} else {
button_record.set_background(ui::Color::black());

22
firmware/baseband/proc_capture.cpp
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@ -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
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@ -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;