diff --git a/Detector.cpp b/Detector.cpp
index 2eda83781..039b0a41c 100644
--- a/Detector.cpp
+++ b/Detector.cpp
@@ -6,6 +6,10 @@
 
 #include "commons.h"
 
+extern "C" {
+void   fil4_(qint16*, qint32*, qint16*, qint32*);
+}
+
 Detector::Detector (unsigned frameRate, unsigned periodLengthInSeconds, unsigned framesPerSignal, QObject * parent)
   : AudioDevice (parent)
   , m_frameRate (frameRate)
@@ -31,8 +35,8 @@ void Detector::clear ()
   // jt9com_.kin = qMin ((msInPeriod * m_frameRate) / 1000, static_cast<unsigned> (sizeof (jt9com_.d2) / sizeof (jt9com_.d2[0])));
   jt9com_.kin = 0;
 
-  // fill buffer with zeros (G4WJS commented out because it might cause decoder hangs)
-  // qFill (jt9com_.d2, jt9com_.d2 + sizeof (jt9com_.d2) / sizeof (jt9com_.d2[0]), 0);
+  // fill buffer with zeros
+  qFill (jt9com_.d2, jt9com_.d2 + sizeof (jt9com_.d2) / sizeof (jt9com_.d2[0]), 0);
 }
 
 qint64 Detector::writeData (char const * data, qint64 maxSize)
@@ -49,10 +53,13 @@ qint64 Detector::writeData (char const * data, qint64 maxSize)
 	  qDebug () << "dropped " << maxSize / sizeof (jt9com_.d2[0]) - framesAccepted << " frames of data on the floor!";
 	}
 
-      store (data, framesAccepted, &jt9com_.d2[jt9com_.kin]);
+      qint32 m_n1,m_n2;
+      m_n1 = framesAccepted;
+      fil4_((qint16 *)data, &m_n1, m_translate, &m_n2);
+      store ((char const *) m_translate, m_n2, &jt9com_.d2[jt9com_.kin]);
 
       unsigned lastSignalIndex (jt9com_.kin / m_framesPerSignal);
-      jt9com_.kin += framesAccepted;
+      jt9com_.kin += m_n2;
       unsigned currentSignalIndex (jt9com_.kin / m_framesPerSignal);
 
       if (currentSignalIndex != lastSignalIndex && m_monitoring)
diff --git a/Detector.hpp b/Detector.hpp
index 65aef4d8d..77375b935 100644
--- a/Detector.hpp
+++ b/Detector.hpp
@@ -49,6 +49,7 @@ private:
   unsigned m_framesPerSignal;
   bool volatile m_monitoring;
   bool m_starting;
+  qint16 m_translate[20000];
 };
 
 #endif
diff --git a/soundin.cpp b/soundin.cpp
index 5dacd7aef..32f478586 100644
--- a/soundin.cpp
+++ b/soundin.cpp
@@ -48,7 +48,7 @@ void SoundInput::start(QAudioDeviceInfo const& device, unsigned channels, int fr
   QAudioFormat format (device.preferredFormat());
   format.setChannelCount (channels);
   format.setCodec ("audio/pcm");
-  format.setSampleRate (12000);
+  format.setSampleRate (48000);
   format.setSampleType (QAudioFormat::SignedInt);
   format.setSampleSize (16);