ComplexModulate

Overview

This module accepts a real or complex input and generates a complex

Discussion

This module multiplies the input by the complex exponential exp(-j2pimodBinn/K) where modBin is an inspector parameter, K is the size of the input buffer (the FFT size) and n = 0:1:(K-1) is the sample number in the block. The only tunable parameter is modBin and K is taken from the wire size.

This module is usually used as part of frequency domain processing. The module effectively shifts the frequency spectrum right by 2pimodBin/K radians/sample. Alternatively, you can think of the modules as shifting by modBin FFT bins.

modBin is a floating-point value and can take on any real value including non-integer values. By default modBin = 0.25. The module supports real and complex inputs and always generates a complex output.

Module Pack

Advanced

ClassID

classID = 1237

Type Definition

typedef struct _ModuleComplexModulate
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
FLOAT32 modBin;                               // Omega of modulation coefficient equation.
FLOAT32* modCoeffs;                           // Modulation coefficient array
} ModuleComplexModulateClass;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
modBin	float	parameter	0	0.25	Unrestricted
modCoeffs	float*	state	1	[32 x 1]	Unrestricted

Pins

Input Pins


Name	in
Description	Real or complex input
Data type	float
Channel range	1
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real and Complex

Output Pins


Name	cmplx
Description	Complex result
Data Type	float

Matlab Usage

File Name: complex_modulate_module.m 
 M=complex_modulate_module(NAME) 
 This module accepts a real or complex input and generates a complex 
 output by multiplying input with exp(j*2*pi*modBin*n/N) 
 Arguments: 
    NAME - name of the module.