TD_IDFFT

This function simply reverses the effects of the forward transform. It takes as its input either a logical-runtime series containing complex number elements, or, alternatively, a logical-runtime series containing amplitude-phase pair elements; runs them through a reverse-transform summation formula; and outputs the original signal (time series or spatial series or arbitrary discrete series) that was input into the TD_DFFT to generate the Fourier coefficients.

Input ports

1. Type: DB Session
   Teradata Connection
   Connection to a Teradata Database Instance
2. Type: Table
   Input
   It takes as its input a logical-runtime series, aka, 'a 1D array', that has been populated previously with Fourier Transform coefficients. The calculated coefficients may exist in either the form of : complex numbers - real and imaginary pairs; or exist as amplitude-phase pairs.

Output ports

1. Type: Table
   output of TD_IDFFT
   output of TD_IDFFT