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Wider maximum waterfall bandwidth.

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This commit is contained in:
John Greb
2014-11-24 11:01:07 +00:00
parent 1964946afe
commit ad68f6a06c
5 changed files with 28 additions and 43 deletions
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plugins/samplesource/rtlsdr/rtlsdrthread.cpp
+13 -26
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@@ -108,12 +108,14 @@ void RTLSDRThread::decimate8(SampleVector::iterator* it, const quint8* buf, qint
for (int pos = 0; pos < len - 15; pos += 8) {
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s1( xreal << 3, yimag << 3 );
pos += 8;
xreal += buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag += buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
xreal = buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4];
yimag = buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6];
Sample s2( xreal << 3, yimag << 3 );
Sample s( xreal << 3, yimag << 3 );
**it = s;
m_decimator2.myDecimate(&s1, &s2);
**it = s2;
(*it)++;
}
}
@@ -144,33 +146,18 @@ void RTLSDRThread::decimate16(SampleVector::iterator* it, const quint8* buf, qin
// Decimate everything by 16x, except 288kHz
// Decimate everything by 16x, except 288kHz by 4x
// and 1152kHz, 2048kHz by 8x
void RTLSDRThread::callback(const quint8* buf, qint32 len)
{
SampleVector::iterator it = m_convertBuffer.begin();
int mode = 0;
if (m_samplerate < 800000)
mode = 2;
switch(mode) {
case 0:
decimate16(&it, buf, len);
break;
case 1:
break;
case 2:
decimate4(&it, buf, len);
break;
case 3:
break;
default:
decimate16(&it, buf, len);
break;
}
decimate4(&it, buf, len);
else if ((m_samplerate == 1152000)||(m_samplerate == 2048000))
decimate8(&it, buf, len);
else
decimate16(&it, buf, len);
m_sampleFifo->write(m_convertBuffer.begin(), it);