PHP Classes

Fast Fourier Transform: Compute the Fast Fourier Transform of sampled data

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fft 0.1GNU General Publi...5Algorithms, PHP 5, Audio
Description 

Author

Michele Andreoli

This class can be used to compute the Fast Fourier Transform (FFT) of sampled data, as well the inverse Fast Fourier transform.

It takes an array of sample data values and calculates the respective Fast Fourier Transform. The result is returned as an array of complex values.

The class can also do the opposite, i.e. compute the inverse Fast Fourier transform .

Innovation Award
PHP Programming Innovation award nominee
May 2010
Number 5

Prize: One downloadable copy of Komodo IDE		 Fast Fourier transform is an algorithm that can be used to compute the spectrum of frequencies of a sound sample or any other type of sampled signal.

This class can be used to compute the Fast Fourier transform of a given sample, as well the inverse operation, rebuild the original signal from its frequency spectrum.

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  Files folder image Files  
File Role Description
Plain text file Complex.class.php Class Complex class
Plain text file FFT.class.php Class FFT class
Accessible without login Plain text file index.php Example Index
Accessible without login HTML file output.html Output Output

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User Comments (1)
Array dimensions limited to power of 2.
11 years ago (Özkan KIRIK)		27%StarStar
 

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Class Why it is needed Dependency
Probability distribution To perform the Fast Fourier Transform and applying the filters at the signal Required