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Add Downsampling

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This commit is contained in:
Geoffrey Merck 2020-04-28 21:37:06 +02:00
parent dac0f26e5d
commit cf18f95a92
6 changed files with 283 additions and 3 deletions
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9
FM.cpp
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@ -41,7 +41,8 @@ m_filterStage2(32768, 0,-32768, 32768, -50339, 19052),
m_filterStage3(32768, -65536, 32768, 32768, -64075, 31460),
m_blanking(),
m_useCOS(true),
m_rfAudioBoost(1U)
m_rfAudioBoost(1U),
m_downsampler(1024)//Size might need adjustement
{
}
@ -74,8 +75,8 @@ void CFM::samples(bool cos, q15_t* samples, uint8_t length)
} else if (CTCSS_NOT_READY(ctcssState) && m_modemState == STATE_FM && i == length - 1) {
//Not enough samples for CTCSS but we already are in FM, trigger the state machine
//but do not trigger the state machine on every single sample, save CPU!
bool validCTCSS = CTCSS_VALID(ctcssState);
stateMachine(validCTCSS && cos, i + 1U);
bool validCTCSS = CTCSS_VALID(ctcssState);
stateMachine(validCTCSS && cos, i + 1U);
}
// Only let audio through when relaying audio
@ -101,6 +102,8 @@ void CFM::samples(bool cos, q15_t* samples, uint8_t length)
currentSample = q15_t(m_filterStage3.filter(m_filterStage2.filter(m_filterStage1.filter(currentSample))));
m_downsampler.addSample(currentSample);
currentSample += m_ctcssTX.getAudio();
samples[i] = currentSample;