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rtty xmt shape 

* changed xmt signal shaper to optimize s/n decoding
    with fldigi decoder.
pull/1/head
David Freese 2014-11-20 18:02:05 -06:00
rodzic 3a00dfcd7f
commit 311925bab2
1 zmienionych plików z 9 dodań i 5 usunięć
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14
src/cw_rtty/rtty.cxx
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@ -907,6 +907,7 @@ if (!progStatus.shaped_rtty) {
mark = m_SymShaper1->Update( sym) * m_Osc1->Update( freq1 );
space = m_SymShaper2->Update(!sym) * m_Osc2->Update( freq2 );
signal = mark + space;
if (maxamp < fabs(signal)) maxamp = fabs(signal);
}
}
@ -915,8 +916,8 @@ if (!progStatus.shaped_rtty) {
for( int i = 0; i < len; ++i ) {
mark = m_SymShaper1->Update( symbol) * m_Osc1->Update( freq1 );
space = m_SymShaper2->Update(!symbol) * m_Osc2->Update( freq2 );
signal = mark + space;
if (maxamp < fabs(signal)) {
maxamp = fabs(signal);
}
@ -970,8 +971,8 @@ if (!progStatus.shaped_rtty) {
for( int i = 0; i < stoplen; ++i ) {
mark = m_SymShaper1->Update( symbol)*m_Osc1->Update( freq1 );
space = m_SymShaper2->Update(!symbol)*m_Osc2->Update( freq2 );
signal = mark + space;
if (maxamp < fabs(signal)) maxamp = fabs(signal);
outbuf[i] = maxamp ? (0.99 * signal / maxamp) : 0.0;
@ -997,8 +998,8 @@ void rtty::flush_stream()
for( int i = 0; i < symbollen * 6; ++i ) {
mark = m_SymShaper1->Update(0)*m_Osc1->Update( freq1 );
space = m_SymShaper2->Update(0)*m_Osc2->Update( freq2 );
signal = mark + space;
if (maxamp < fabs(signal)) maxamp = fabs(signal);
outbuf[i] = maxamp ? (0.99 * signal / maxamp) : 0.0;
@ -1302,8 +1303,11 @@ void SymbolShaper::Preset(double baud, double sr)
for( int x=0; x<m_table_size; ++x ) {
int const offset = m_table_size/2;
double const T = sample_rate / (baud_rate*2.0); // symbol-length in samples
double const t = (x-offset); // symbol-time relative to zero
double wfactor = 1.0 / 1.568; // optimal
// symbol-length in samples if wmultiple = 1.0
double const T = wfactor * sample_rate / (baud_rate*2.0);
// symbol-time relative to zero
double const t = (x-offset);
m_sinc_table[x] = rcos( t, T, 1.0 );