Invert

Overview

Phase invert module

Discussion

This module inverts the phase of a signal. Inverting the phase is simply multiplying by -1. The variable isInverted is a Boolean which controls the behavior. When isInverted=1, the module multiplies the input signal by -1. When isInverted=0, the module passes the input signal through unchanged. Internally, the module uses a first order smoother to seamlessly switch between +1 and -1. The smoothing time of the switching process is set by the smoothingTime variable.

Type Definition

CODE

typedef struct _ModuleInvert
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 isInverted;                             // Boolean that specifies whether the signal is inverted (=1) or not (=0).
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process.
    FLOAT32 currentGain;                          // Instantaneous gain applied by the module. This is also the starting gain of the module.
    FLOAT32 smoothingCoeff;                       // Smoothing coefficient.
} ModuleInvertClass;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
isInverted	int	parameter	0	0	0:1
smoothingTime	float	parameter	0	10	0:1000	msec
currentGain	float	state	1	1	-1:1	linear
smoothingCoeff	float	derived	1	0.002081	Unrestricted

Pins

Input Pins

Name: in

Description: audio input

Data type: float

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real and Complex

Output Pins

Name: out

Description: audio output

Data type: float

MATLAB Usage

File Name: invert_module.m

CODE

 M=invert_module(NAME)
 Creates a module which inverts the phase of a signal (that is, sets the
 gain equal to -1). The change happens smoothly with a specified 
 smoothing time.
 
 Arguments:
    NAME - name of the module.