Floating Point Dither For All

1 files changed, 6 insertions, 19 deletions

diff --git a/plugins/MacAU/C5RawBuss/C5RawBuss.cpp b/plugins/MacAU/C5RawBuss/C5RawBuss.cpp
index 4f45ac0..9cca2dd 100755
--- a/plugins/MacAU/C5RawBuss/C5RawBuss.cpp
+++ b/plugins/MacAU/C5RawBuss/C5RawBuss.cpp
@@ -160,9 +160,7 @@ void		C5RawBuss::C5RawBussKernel::Reset()
 {
 	lastFXBuss = 0.0;
 	lastSampleBuss = 0.0;
-	fpNShapeA = 0.0;
-	fpNShapeB = 0.0;
-	fpFlip = true;
+	fpNShape = 0.0;
 }
 
 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -177,9 +175,6 @@ void		C5RawBuss::C5RawBussKernel::Process(	const Float32 	*inSourceP,
 	UInt32 nSampleFrames = inFramesToProcess;
 	const Float32 *sourceP = inSourceP;
 	Float32 *destP = inDestP;
-	Float32 fpTemp;
-	long double fpOld = 0.618033988749894848204586; //golden ratio!
-	long double fpNew = 1.0 - fpOld;	
 
 	long double centering = GetParameter( kParam_One ) * 0.5;
 	centering = 1.0 - pow(centering,5);
@@ -237,19 +232,11 @@ void		C5RawBuss::C5RawBussKernel::Process(	const Float32 	*inSourceP,
 		//build new signal off what was present in output last time
 		//slew aspect
 		
-		//noise shaping to 32-bit floating point
-		if (fpFlip) {
-			fpTemp = inputSample;
-			fpNShapeA = (fpNShapeA*fpOld)+((inputSample-fpTemp)*fpNew);
-			inputSample += fpNShapeA;
-		}
-		else {
-			fpTemp = inputSample;
-			fpNShapeB = (fpNShapeB*fpOld)+((inputSample-fpTemp)*fpNew);
-			inputSample += fpNShapeB;
-		}
-		fpFlip = !fpFlip;
-		//end noise shaping on 32 bit output
+		//32 bit dither, made small and tidy.
+		int expon; frexpf((Float32)inputSample, &expon);
+		long double dither = (rand()/(RAND_MAX*7.737125245533627e+25))*pow(2,expon+62);
+		inputSample += (dither-fpNShape); fpNShape = dither;
+		//end 32 bit dither
 		
 		*destP = inputSample;