Overview

Forward and inverse FFT of complex data

Discussion

Computes the forward or inverse FFT of complex data. The parameter .dir control whether a forward (= +1) or inverse (= -1) FFT is computed. The module supports multichannel signals.

Type Definition

typedef struct _ModuleCfftFract32
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 dir;                                    // Transform direction. Forward = 1. Inverse = -1
    fract32 onebyBlockSize;                       // value of 1/BlockSize in fractional value
} ModuleCfftFract32Class;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
dir	int	const	0	1	-1, 1
onebyBlockSize	fract32	derived	0	0.5	Unrestricted

Pins

Input Pins

Name: in

Description: Complex input

Data type: fract32

Channel range: Unrestricted

Block size range: 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536

Sample rate range: Unrestricted

Complex support: Complex

Output Pins

Name: out

Description: Complex output

Data type: fract32

Scratch Pins

Channel count: 1

Block size: 2

Sample rate: 48000

MATLAB Usage

File Name: cfft_fract32_module.m

 M=cfft_fract32_module(NAME, ISFFT)
 Computes the forward or inverse FFT of complex input data.  The input
 block size must be a power of 2.  The module supports multichannel
 signals.  Arguments:
    NAME - name of the module.
    ISFFT :  1 for calculating FFT (default)
             -1 for calculating IFFT

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(8.D.2.2) CfftFract32

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