Fft Library 11 Cpp 1.1

File	fft-library-11-ppc-cpp.hqx
Size	37.2 KB
Version	1.1
Category	Development
Architecture	PowerPC

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Enclosed is a stuffit archive of version 1.1 of my fft 'C' source code. Now includes an already compiled shared library in case your compiler doesn't like my code. Revisions version 1.1: Re-arranged to put fft routines in a shared library and changed source file name to fftlib.c. Removed some ugly optimizations that are no longer needed for CodeWarrier. Fast Fourier Transform routines. Routines are provided for the complex forward and inverse transforms as well as for a real forward transform. I coded these to optimize execution speed on a PowerPC processor. Also included are some simple test programs which time the FFTs. Compiled with Metrowerk's Codewarrier 7/8, my PowerMac 8100/80 executes a 2048 point real transform in about one millisecond. I would definitly like to know the timing results with other compilers and computers. Warning- treat this code as untested. Before you use these routines in a program, be sure to test them for latent bugs! This code is public domain, do anything you want to with it. 1024 Point complex FFT timings with best optimization: 0.8 ms. Powermac 8100/80, CodeWarrier. 0.36 ms. Powermac 9500/chipped to 150, CodeWarrier (thanks to Robert Kay.) 2.7 ms Intel Plato 2 with Pentium P90, Visual C++ compiler, Windows 95. 1.7 ms Intel Plato 2 with Pentium P90, Intel's Native Signal Processing FFT routine, Windows 95.