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Extract ChannelDecimator into separate files.

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Jared Boone 2015-08-27 09:49:14 -07:00
parent 035ec84f04
commit c92bf12fbd
4 changed files with 160 additions and 101 deletions
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103
firmware/baseband/main.cpp
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@ -51,6 +51,8 @@
#include "channel_stats_collector.hpp"
#include "audio_stats_collector.hpp"
#include "channel_decimator.hpp"
#include "block_decimator.hpp"
#include "clock_recovery.hpp"
#include "access_code_correlator.hpp"
@ -76,107 +78,6 @@
constexpr auto baseband_thread_priority = NORMALPRIO + 20;
constexpr auto rssi_thread_priority = NORMALPRIO + 10;
class ChannelDecimator {
public:
enum class DecimationFactor {
By4,
By8,
By16,
By32,
};
ChannelDecimator(
DecimationFactor f
) : decimation_factor { f }
{
}
void set_decimation_factor(const DecimationFactor f) {
decimation_factor = f;
}
buffer_c16_t execute(buffer_c8_t buffer) {
auto decimated = execute_decimation(buffer);
return decimated;
}
private:
std::array<complex16_t, 1024> work_baseband;
const buffer_c16_t work_baseband_buffer {
work_baseband.data(),
work_baseband.size()
};
const buffer_s16_t work_audio_buffer {
(int16_t*)work_baseband.data(),
sizeof(work_baseband) / sizeof(int16_t)
};
//const bool fs_over_4_downconvert = true;
dsp::decimate::TranslateByFSOver4AndDecimateBy2CIC3 translate;
//dsp::decimate::DecimateBy2CIC3 cic_0;
dsp::decimate::DecimateBy2CIC3 cic_1;
dsp::decimate::DecimateBy2CIC3 cic_2;
dsp::decimate::DecimateBy2CIC3 cic_3;
dsp::decimate::DecimateBy2CIC3 cic_4;
DecimationFactor decimation_factor { DecimationFactor::By32 };
buffer_c16_t execute_decimation(buffer_c8_t buffer) {
/* 3.072MHz complex<int8_t>[2048], [-128, 127]
* -> Shift by -fs/4
* -> 3rd order CIC: -0.1dB @ 0.028fs, -1dB @ 0.088fs, -60dB @ 0.468fs
* -0.1dB @ 86kHz, -1dB @ 270kHz, -60dB @ 1.44MHz
* -> gain of 256
* -> decimation by 2
* -> 1.544MHz complex<int16_t>[1024], [-32768, 32512] */
const auto stage_0_out = translate.execute(buffer, work_baseband_buffer);
//if( fs_over_4_downconvert ) {
// // TODO:
//} else {
// Won't work until cic_0 will accept input type of buffer_c8_t.
// stage_0_out = cic_0.execute(buffer, work_baseband_buffer);
//}
/* 1.536MHz complex<int16_t>[1024], [-32768, 32512]
* -> 3rd order CIC: -0.1dB @ 0.028fs, -1dB @ 0.088fs, -60dB @ 0.468fs
* -0.1dB @ 43kHz, -1dB @ 136kHz, -60dB @ 723kHz
* -> gain of 8
* -> decimation by 2
* -> 768kHz complex<int16_t>[512], [-8192, 8128] */
auto cic_1_out = cic_1.execute(stage_0_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By4 ) {
return cic_1_out;
}
/* 768kHz complex<int16_t>[512], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 384kHz complex<int16_t>[256], [-32768, 32512] */
auto cic_2_out = cic_2.execute(cic_1_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By8 ) {
return cic_2_out;
}
/* 384kHz complex<int16_t>[256], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 192kHz complex<int16_t>[128], [-32768, 32512] */
auto cic_3_out = cic_3.execute(cic_2_out, work_baseband_buffer);
if( decimation_factor == DecimationFactor::By16 ) {
return cic_3_out;
}
/* 192kHz complex<int16_t>[128], [-32768, 32512]
* -> 3rd order CIC decimation by 2, gain of 1
* -> 96kHz complex<int16_t>[64], [-32768, 32512] */
auto cic_4_out = cic_4.execute(cic_3_out, work_baseband_buffer);
return cic_4_out;
}
};
static constexpr iir_biquad_config_t audio_hpf_config {
{ 0.93346032f, -1.86687724f, 0.93346032f },
{ 1.0f , -1.97730264f, 0.97773668f }