|Describe floating point FFT|
|Extract this archive and copy the files to a directory. Then double-click FftFloat.sln. You need Visual Studio 2008 Standard Edition, if you don't have it, double-click on Exe file in Debug directory.
Microsoft Visual Studio starts. The project is FftFloat.
Choose "Solution" tab in the left window, then double-click FftFloatView.cpp.
Please look for FftCal function. iW[i] contains the input wave and tW[i] does the trigonometric function.
The input wave and the trigonometric function are multiplied. You may find triple-loops wrapping the calculation.
And please find that variables are defined as "double", that is floating point number.