Debounce

Overview

Debounces signals

Discussion

Debouncer module which limits how often a signal can change. After a signal changes, the module holds the current block for .waitTime milliseconds before allowing it to change again. If a signal is constantly changing then it will only change every .waitTime milliseconds.

The module supports any data type but only 1 channel of data with any blockSize of samples. When a change is detected, the .count variable counts down from .waitCount down to zero before allowing another change.

At the start of processing, the module samples and holds the first input block. It holds this block for .waitTime until finally resampling the input.

Type Definition

CODE

typedef struct _ModuleDebounce
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    FLOAT32 waitTime;                             // Waiting time before switching
    INT32 count;                                  // Counts down to zero
    INT32 waitCount;                              // waitTime as a number of blocks
    INT32 firstTime;                              // Indicates first block processed
    INT32* previousBlock;                         // Held block
} ModuleDebounceClass;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
waitTime	float	parameter	0	100	0:5000	msec
count	int	state	0	0	Unrestricted
waitCount	int	derived	1	149	Unrestricted
firstTime	int	state	1	1	Unrestricted
previousBlock	float*	state	1	[32 x 1]	Unrestricted

Pins

Input Pins

Name: in

Description: audio input

Data type: {float, int, fract32}

Channel range: 1

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: audio output

Data type: {float, int, fract32}

MATLAB Usage

File Name: debounce_module.m

CODE

 M = debounce_module(NAME)
 Audio Weaver module which debounces a signal (reduces the frequency
 of changes).  Arguments:
    NAME - name of the module.