8.0.1. fftw: an interface to the FFTW3 Fourier Transform library |
(packages/fftw/fftw.lsh) |

This is an interface to the FFTW3 Fourier Transform library. To use this interface, you must first install the FFTW3 library and development package. fftw3 is distributed with most Linux distros as fftw3 or libfftw3 and libfftw3-devel.

8.0.1.0. High Level Fourier Transform functions |
(packages/fftw/fftw.lsh) |

8.0.1.0.0. (spectrogram signal window stride) |
(packages/fftw/fftw.lsh) |

compute and return the spectrogram of signal in vector

(spectrogram m 512 256)

8.0.1.0.1. (idx1-power-spectrum in out) |
(packages/fftw/fftw.lsh) |

compute the power spectrum of a waveform

8.0.1.0.2. (idx1-complex2norm in out) |
(packages/fftw/fftw.lsh) |

Compute the vector of norms of a vector of complex numbers.

8.0.1.1. masking window utilities |
(packages/fftw/fftw.lsh) |

8.0.1.1.0. (make-hanning-window-tanh n p) |
(packages/fftw/fftw.lsh) |

make

8.0.1.1.1. (make-hanning-window-tanh n) |
(packages/fftw/fftw.lsh) |

make an

8.0.1.2. Low-Level Fast Fourier Transform funtions (FFT) |
(packages/fftw/fftw.lsh) |

These functions perform 1D and 2D FFTs from complex to complex, and real to complex.

8.0.1.2.0. (fftw-dct-1d (in out forward norm) |
(packages/fftw/fftw.lsh) |

compute the 1D DCT-II transform of vector

8.0.1.2.1. (fftw-dht-1d in out norm) |
(packages/fftw/fftw.lsh) |

computes the discrete hartley transform of

8.0.1.2.2. (fftw-dft-c2c-1d in out forward norm) |
(packages/fftw/fftw.lsh) |

compute the complex-to-complex 1D fourier transform of complex vector

8.0.1.2.3. (fftw-dft-r2c-1d in out norm) |
(packages/fftw/fftw.lsh) |

compute the real-to-complex 1D fourier transform of real vector

8.0.1.2.4. (fftw-dft-c2r-1d in out norm) |
(packages/fftw/fftw.lsh) |

compute the complex-to-real backwards 1D fourier transform of complex vector

8.0.1.2.5. (fftw-dft-c2c-2d in out forward norm) |
(packages/fftw/fftw.lsh) |

compute the complex-to-complex 2D fourier transform of complex matrix

8.0.1.2.6. (fftw-dft-r2c-2d in out norm) |
(packages/fftw/fftw.lsh) |

compute the real-to-complex 2D fourier transform of real matrix