IfftFract32
Overview
Inverse FFT of real data on fixed point
Discussion
Computes the inverse fast Fourier transform of a complex half spectrum yielding a real-valued result. The blockSize, N, of the real valued output must be a power of 2 in the range [4...1024]. The input pin is complex with a blockSize of N/2+1 complex samples. The input contains the complex transform at samples k=0, 1, ..., N/2. The DC (k=0) and Nyquist (k=N/2) samples always have an imaginary component of 0.
Type Definition
typedef struct _ModuleIfftFract32
{
ModuleInstanceDescriptor instance; // Common Audio Weaver module instance structure
fract32 onebyBlockSize; // value of 1/BlockSize in fractional value
} ModuleIfftFract32Class;
Variables
Properties
Name | Type | Usage | isHidden | Default value | Range | Units |
onebyBlockSize | fract32 | derived | 0 | 0.25 | Unrestricted | onebyBlockSize |
Pins
Input Pins
Name: in
Description: Complex input
Data type: fract32
Channel range: Unrestricted
Block size range: 3, 5, 9, 17, 33, 65, 129, 257, 513, 1025
Sample rate range: Unrestricted
Complex support: Complex
Output Pins
Name: out
Description: Real input
Data type: fract32
Scratch Pins
Channel count: 1
Block size: 8
Sample rate: 48000
MATLAB Usage
File Name: ifft_fract32_module.m
M=ifft_fract32_module(NAME)
Computes the inverse FFT of a real time domain Fractional sequence. The input
block is complex valued with a blockSize of N/2+1. The output is
real data of length N. The module supports multichannel signals.
Arguments:
NAME - name of the module.