IDFT

Purpose:

Calculates the inverse Discrete Fourier Transform of any series or series expression in Real/Imaginary form.

Syntax:

IDFT(series)

series

-

An input series or array.

Returns:

A series or table.

Example:

Try setting up a three Window Worksheet:

 

W1: gsin(128, 0.01, 1.0)

W2: ifft(W1)

W3: idft(W1)

 

Windows 2 and 3 will produce the same results, however the IDFT will be considerably slower.

Remarks:

The IDFT returns the same result as an IFFT. Although the IDFT is a more straightforward method than the IFFT is for calculating the Discrete Fourier Transform, it is also a much slower algorithm.

See Also:

DFT

IFFT

INVPSD

References:

Oppenheim and Schafer.

Digital Signal Processing

Prentice Hall, 1975

 

Digital Signal Processing Committee

Programs for Digital Signal Processing

I.E.E.E. Press, 1979