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This version (09 Jul 2019 08:17) was approved by Ashwin Radhakrishnan.

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IFFT Window


This Module performs N-point IFFT on input samples in PCMx format. The FFT Output is given in the form of PCMx samples, the Blocksize of which is 3 * Schematic BlockSize.The first Schematic Block Size number of samples in a PCMx input contains the header information carried from the previous Module (say in this case FFT). Only when the PCMx type matches, IFFT is performed and output is given as PCM samples.



Input Pins

NameFormat [int/dec] - [control/audio]Function Description
Pin 0: Input(PCMx) decimal - Audio Frequency Domain Real Input
Pin 1: Input(PCMx) decimal - Audio Frequency Domain Imaginary Input


Output Pins

NameFormat [int/dec] - [control/audio]Function Description
Pin 0: Output(PCM) decimal - Audio Real PCM Output
Pin 1: Output(PCM) decimal - Audio Imaginary PCM Output


Grow Algorithm

The module does not support Growth and Add

Configuration



GUI Control NameDefault ValueRangeFunction Description
FFT Size 64 16 to 1024 Size of the IFFT(Should be power of 2,greater than or equal to preceding FFT Size)



DSP Parameter Information

GUI Control NameCompiler NameFunction Description
IFFT Size Ext_IFFTProc_algo_SC5xxAlg1MaxN Size of IFFT(Should be power of 2,greater than or equal to preceding FFT Size)



Here,

  • Green - Algorithm Name
  • Red - Instance Number (Changes for each instance)
  • Blue - Parameter Name



Algorithm Description

This module performs a Complex IFFT on the input samples received in PCMx format. The twiddle coefficients are computed within the code. Since Windowing is done in the FFT module for 2N samples, overlap and add for N samples are done at the IFFT end.

Supported ICs

  1. ADSP215xx
  2. ADSPSC5xx
resources/tools-software/sigmastudio/toolbox/frequencydomain/windowedifft.txt · Last modified: 27 Jun 2019 07:23 by Ashwin Radhakrishnan