diff --git a/src/ngfmdmasync.cpp b/src/ngfmdmasync.cpp
index 7512e0a..7b9c1cf 100644
--- a/src/ngfmdmasync.cpp
+++ b/src/ngfmdmasync.cpp
@@ -108,7 +108,7 @@ void ngfmdmasync::SetDmaAlgo()
 		//fprintf(stderr,"Last cbp :  src %x dest %x next %x\n",cbp->src,cbp->dst,cbp->next);
 }
 
-void ngfmdmasync::SetFrequencySample(uint32_t Index,double Frequency)
+void ngfmdmasync::SetFrequencySample(uint32_t Index,float Frequency)
 {
 	Index=Index%buffersize;	
 	sampletab[Index]=(0x5A<<24)|GetMasterFrac(Frequency);
@@ -116,7 +116,7 @@ void ngfmdmasync::SetFrequencySample(uint32_t Index,double Frequency)
 	PushSample(Index);
 }
 
-void ngfmdmasync::SetFrequencySamples(double *sample,size_t Size)
+void ngfmdmasync::SetFrequencySamples(float *sample,size_t Size)
 {
 	size_t NbWritten=0;
 	int OSGranularity=100;
diff --git a/src/ngfmdmasync.h b/src/ngfmdmasync.h
index c2491e3..227245e 100644
--- a/src/ngfmdmasync.h
+++ b/src/ngfmdmasync.h
@@ -17,8 +17,8 @@ class ngfmdmasync:public bufferdma,public clkgpio,public pwmgpio,public pcmgpio
 	void SetDmaAlgo();
 	
 	void SetPhase(bool inversed);
-	void SetFrequencySample(uint32_t Index,double Frequency);
-	void SetFrequencySamples(double *sample,size_t Size);
+	void SetFrequencySample(uint32_t Index,float Frequency);
+	void SetFrequencySamples(float *sample,size_t Size);
 }; 
 
 #endif