IFFT

IFFT ( Inverse Fast Fourier Transformation Data Sheet ) stands for the inverse fast Fourier transform (FFT). Converts / transforms a signal from the frequency domain back into the time domain.

The IFFT and FFT are very similar. The only difference is that when the signs of the exponents of the IFFT complex rotation factors must be inverted, and the result by the factor 1 / n is to multiply. Said additional multiplication can be performed in the implementation as a shift operation, if the factor n in the FFT is a power of two. A more detailed description of this relationship is included in the article on the FFT.

Areas of application

  • Synthesis of timing signals in the frequency domain (for example, the generation of electronic sounds )
  • Digital modulation techniques (eg multi-carrier method: OFDM, Orthogonal Frequency Division Multiplexing engl. )
  • Calculating the filter coefficients for digital filter (for example, according to the window method)
  • Filtering in the frequency domain and inverse transform in the time domain
  • Fourier inverse transform from the frequency to the time domain into the signal analysis

More application areas are also here to see the article on the FFT.

  • Numerical Mathematics
  • Digital Signal Processing
407710
de