### Stereo Enhancer

References : Posted by kurmisk[at]inbox[DOT]lv
Notes :

Stereo Enhanca

Code :

// WideCoeff  0.0 .... 1.5

#define StereoEnhanca(SamplL,SamplR,MonoSign, \
DeltaLeft,WideCoeff ) \
MonoSign = (SamplL + SamplR)/2.0; \
DeltaLeft = SamplL - MonoSign; \
DeltaLeft = DeltaLeft * WideCoeff; \
SamplL=SamplL + DeltaLeft; \
SamplR=SamplR - DeltaLeft;

from : tahome[AT]postino[DOT]ch
comment : This code is nonsense, all it does is create an out-of-balance stereo field... --th

from : xeeton[AT]gmail[DOT]com
comment : #define StereoEnhanca(SamplL,SamplR,MonoSign, DeltaLeft,DeltaRight,WideCoeff ) MonoSign = (SamplL + SamplR)/2.0; DeltaLeft = SamplL - MonoSign; DeltaLeft *= WideCoeff; DeltaRight = SamplR - MonoSign; DeltaRight *= WideCoeff; SamplL += DeltaLeft; SamplR += DeltaRight; I think this is more along the lines of what you were trying to accomplish. I doubt this is the correct way of implementing this type of thing however.

from : mark_hamburg[AT]baymoon[DOT]com
comment : I believe both pieces of code do the same thing. Since MonoSign is set equal to the average of the two signals, in the second case DeltaRight = -DeltaLeft.

comment : Note 'half' is defined as const half:single = 0.5; This is an ommission in the above posting

from : gtekprog[AT]hotmail[DOT]com
comment : This original code makes indeed no sense. >#define StereoEnhanca(SamplL,SamplR,MonoSign, \ >DeltaLeft,WideCoeff ) \ >MonoSign = (SamplL + SamplR)/2.0; \ >DeltaLeft = SamplL - MonoSign; \ >DeltaLeft = DeltaLeft * WideCoeff; \ >SamplL=SamplL + DeltaLeft; \ >SamplR=SamplR - DeltaLeft; Deltaleft hold no stereoinformation. explained: Deltaleft=L-(L+R) = R!!! So, in this example your stereo image would slide to the right more as you put widecoeff higher. A better implementation is the following code. #define StereoEnhanca(SamplL,SamplR,MonoSign, \ stereo,WideCoeff ) \ MonoSign = (SamplL + SamplR)/2.0; \ stereo = SamplL - Sampl1L; \ stereo = DeltaLeft * WideCoeff; \ SamplL=SamplR + stereo; // R+Stereo = L SamplR=SamplL - stereo; // L-Stereo = R This way of stereoenhancement will lead to exaggerated reverberation effects ( snaredrums). This is not the best way to do widening, but it is the easiest. Gtekprog. Evert Verduin

from : gtekprog[AT]hotmail[DOT]com
comment : oops, stereo = SamplL - Sampl1L; needs ofcourse to be stereo = SamplL - Sampl1R; and stereo = DeltaLeft * WideCoeff; \ needs to be stereo = stereo * WideCoeff; \ Again the correct code: #define StereoEnhanca(SamplL,SamplR,MonoSign, \ stereo,WideCoeff ) \ MonoSign = (SamplL + SamplR)/2.0; \ stereo = SamplL - Sampl1R; \ stereo = stereo * WideCoeff; \ SamplL=SamplR + stereo; // R+Stereo = L SamplR=SamplL - stereo; // L-Stereo = R This will do. Evert

from : claytonhotson[AT]gmail[DOT]com
comment : You mean to use MonoSign variable somewhere - as in: #define StereoEnhanca(SamplL,SamplR,MonoSign, \ stereo,WideCoeff ) \ MonoSign = (SamplL + SamplR)/2.0; \ stereo = SamplL - Sampl1R; \ stereo = stereo * WideCoeff; \ SamplL = MonoSign + stereo; // R+Stereo = L SamplR = MonoSign - stereo; // L-Stereo = R Or some variation? Clayton

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