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Support squelch in pocsag (#1415)

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* Support squelch in pocsag

* Revert smooth threshold
This commit is contained in:
Kyle Reed 2023-08-27 15:56:40 -07:00 • committed by GitHub
parent d8930db8af
commit e7e1bedcad
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GPG key ID: 4AEE18F83AFDEB23
7 changed files with 100 additions and 78 deletions
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39
firmware/baseband/proc_pocsag.cpp
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@ -24,12 +24,13 @@
#include "proc_pocsag.hpp"
#include "dsp_iir_config.hpp"
#include "event_m4.hpp"
#include <cstdint>
#include <cstddef>
#include <algorithm>
#include <cmath>
#include <cstdint>
#include <cstddef>
void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
// This is called at 1500Hz
@ -41,9 +42,13 @@ void POCSAGProcessor::execute(const buffer_c8_t& buffer) {
const auto decim_1_out = decim_1.execute(decim_0_out, dst_buffer);
const auto channel_out = channel_filter.execute(decim_1_out, dst_buffer);
auto audio = demod.execute(channel_out, audio_buffer);
smooth.Process(audio.p, audio.count); // Smooth the data to make decoding more accurate
// Output audio pre-smoothing so squelch actually works.
// NB: It's useful to output *after* when debugging the smoothing filter.
audio_output.write(audio);
// Smooth the data to make decoding more accurate.
smooth.Process(audio.p, audio.count);
processDemodulatedSamples(audio.p, 16);
extractFrames();
}
@ -71,8 +76,23 @@ int POCSAGProcessor::OnDataFrame(int len, int baud) {
}
void POCSAGProcessor::on_message(const Message* const message) {
if (message->id == Message::ID::POCSAGConfigure)
configure();
switch (message->id) {
case Message::ID::POCSAGConfigure:
configure();
break;
case Message::ID::NBFMConfigure: {
auto config = reinterpret_cast<const NBFMConfigureMessage*>(message);
audio_output.configure(
audio_24k_hpf_300hz_config,
audio_8k_deemph_300_6_config,
config->squelch_level / 100.0);
break;
}
default:
break;
}
}
void POCSAGProcessor::configure() {
@ -91,13 +111,10 @@ void POCSAGProcessor::configure() {
decim_1.configure(taps_11k0_decim_1.taps, 131072);
channel_filter.configure(taps_11k0_channel.taps, 2);
demod.configure(demod_input_fs, 4'500); // FSK +/- 4k5Hz.
// Smoothing should be roughly sample rate over max baud
// 24k / 3.2k is 7.5
smooth.SetSize(8);
// TODO: support squelch?
// audio_output.configure(message.audio_hpf_config, message.audio_deemph_config, (float)message.squelch_level / 100.0);
audio_output.configure(false);
// Smoothing should be roughly sample rate over max baud
// 24k / 3.2k = 7.5
smooth.SetSize(8);
// Set up the frame extraction, limits of baud
setFrameExtractParams(demod_input_fs, 4000, 300, 32);