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Enhancements to the decimator by 32

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This commit is contained in:
f4exb 2015-06-07 17:50:16 +02:00
parent 833890a1ea
commit 661ed3eb28
2 changed files with 9 additions and 8 deletions
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12
plugins/samplesource/bladerf/bladerfthread.cpp
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@ -28,7 +28,7 @@ BladerfThread::BladerfThread(struct bladerf* dev, SampleFifo* sampleFifo, QObjec
m_dev(dev),
m_convertBuffer(BLADERF_BLOCKSIZE),
m_sampleFifo(sampleFifo),
m_samplerate(2400000),
m_samplerate(3072000),
m_log2Decim(0)
{
}
@ -193,8 +193,8 @@ void BladerfThread::decimate32(SampleVector::iterator* it, const qint16* buf, qi
for (int pos = 0; pos < len - 63; ) {
for (int i = 0; i < 8; i++) {
xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 2; // was shift 4
yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 2; // was shift 4
xreal[i] = (buf[pos+0] - buf[pos+3] + buf[pos+7] - buf[pos+4]) << 1;
yimag[i] = (buf[pos+1] - buf[pos+5] + buf[pos+2] - buf[pos+6]) << 1;
pos += 8;
}
@ -212,10 +212,10 @@ void BladerfThread::decimate32(SampleVector::iterator* it, const qint16* buf, qi
m_decimator2.myDecimate(&s5, &s6);
m_decimator2.myDecimate(&s7, &s8);
m_decimator2.myDecimate(&s2, &s4);
m_decimator2.myDecimate(&s6, &s8);
m_decimator4.myDecimate(&s2, &s4);
m_decimator4.myDecimate(&s6, &s8);
m_decimator4.myDecimate(&s4, &s8);
m_decimator8.myDecimate(&s4, &s8);
**it = s8;
(*it)++;

5
plugins/samplesource/bladerf/bladerfthread.h
View File

@ -52,8 +52,9 @@ private:
int m_samplerate;
unsigned int m_log2Decim;
IntHalfbandFilter m_decimator2;
IntHalfbandFilter m_decimator4;
IntHalfbandFilter m_decimator2; // 1st stages
IntHalfbandFilter m_decimator4; // 2nd stages
IntHalfbandFilter m_decimator8; // 3rd stages
void run();
void decimate1(SampleVector::iterator* it, const qint16* buf, qint32 len);