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ggwave : do not compute Tx amplitudes when Tx only tones

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This commit is contained in:
Georgi Gerganov
2022-05-29 17:58:07 +03:00
parent f6378c7b09
commit fb2dcb3a37
1 changed files with 31 additions and 28 deletions
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59
src/ggwave.cpp
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@@ -700,34 +700,6 @@ bool GGWave::encode(const CBWaveformOut & cbWaveformOut) {
m_resampler->reset();
}
for (int k = 0; k < (int) m_tx->phaseOffsets.size(); ++k) {
m_tx->phaseOffsets[k] = (M_PI*k)/(m_tx->txProtocol.nDataBitsPerTx());
}
// note : what is the purpose of this shuffle ? I forgot .. :(
//std::random_device rd;
//std::mt19937 g(rd());
//std::shuffle(phaseOffsets.begin(), phaseOffsets.end(), g);
for (int k = 0; k < (int) m_tx->dataBits.size(); ++k) {
const double freq = bitFreq(m_tx->txProtocol, k);
const double phaseOffset = m_tx->phaseOffsets[k];
const double curHzPerSample = m_hzPerSample;
const double curIHzPerSample = 1.0/curHzPerSample;
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx->bit1Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*(freq*curIHzPerSample) + phaseOffset);
}
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx->bit0Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*((freq + m_hzPerSample*m_freqDelta_bin)*curIHzPerSample) + phaseOffset);
}
}
const int nECCBytesPerTx = getECCBytesForLength(m_tx->txDataLength);
const int sendDataLength = m_tx->txDataLength + m_encodedDataOffset;
const int totalBytes = sendDataLength + nECCBytesPerTx;
@@ -813,6 +785,37 @@ bool GGWave::encode(const CBWaveformOut & cbWaveformOut) {
}
}
// compute Tx data
{
for (int k = 0; k < (int) m_tx->phaseOffsets.size(); ++k) {
m_tx->phaseOffsets[k] = (M_PI*k)/(m_tx->txProtocol.nDataBitsPerTx());
}
// note : what is the purpose of this shuffle ? I forgot .. :(
//std::random_device rd;
//std::mt19937 g(rd());
//std::shuffle(phaseOffsets.begin(), phaseOffsets.end(), g);
for (int k = 0; k < (int) m_tx->dataBits.size(); ++k) {
const double freq = bitFreq(m_tx->txProtocol, k);
const double phaseOffset = m_tx->phaseOffsets[k];
const double curHzPerSample = m_hzPerSample;
const double curIHzPerSample = 1.0/curHzPerSample;
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx->bit1Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*(freq*curIHzPerSample) + phaseOffset);
}
for (int i = 0; i < m_samplesPerFrame; i++) {
const double curi = i;
m_tx->bit0Amplitude[k][i] = std::sin((2.0*M_PI)*(curi*m_isamplesPerFrame)*((freq + m_hzPerSample*m_freqDelta_bin)*curIHzPerSample) + phaseOffset);
}
}
}
int frameId = 0;
uint32_t offset = 0;
const float factor = m_sampleRate/m_sampleRateOut;