Overview

General purpose time out module with configurable timeout in seconds

Discussion

General purpose time out module for floating-point signals. The module counts the blocks untill the timeOut seconds reached. Behaviour after the timeout is controlled by the parameter timeOutBehaviour. It is a droplist control with 0-mute output, 1-attenuate output and 2-Sine tone output. The attenuation level is controled by the parameter outputLevel in dB.

The module supports multiple input and output pins using the argument NUMPINS. By default, NUMPINS=1 and the module has a single input and output pin. If you set NUMPINS > 1 then the timeout applied on all pins with same settings.

Type Definition

typedef struct _ModuleTimeOut
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    FLOAT32 timeOut;                              // Timeout value in seconds. Module waits these many seconds and applies timeout based on timeOutBehaviour.
    INT32 timeOutBehaviour;                       // Selects the timeout behavior: MuteTheOutput=0 ReduceTheOutputLevel=1 PlaySineTone=2
    FLOAT32 outputLevel;                          // Output level after timeout in dB.
    FLOAT32 currentGain;                          // Instantaneous gain applied by the module. This is also the starting gain of the module.
    FLOAT32 gain;                                 // Target gain in linear units.
    FLOAT32 sineFreq;                             // Sine tone frequency in Hz.
    INT32 sineTableSize;                          // Sine table length.
    INT32 sineTableIndx;                          // Sine table read index.
    INT32 currentBlockCount;                      // Blocks counter.
    INT32 blockCounterCount;                      // Number of blocks to wait before timeout occures.
    FLOAT32 smoothingTime;                        // Time constant of the smoothing process.
    FLOAT32 smoothingCoeff;                       // Smoothing coefficient.
    FLOAT32* sineTable;                           // Pre-computed Sine tone table.
} ModuleTimeOutClass;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
timeOut	float	parameter	0	10	Unrestricted	sec
timeOutBehaviour	int	parameter	0	0	0:2
outputLevel	float	parameter	0	0	-50:0
currentGain	float	state	0	0	Unrestricted
gain	float	derived	1	1	Unrestricted
sineFreq	float	const	1	240	Unrestricted
sineTableSize	int	derived	1	200	Unrestricted
sineTableIndx	int	state	1	0	Unrestricted
currentBlockCount	int	state	1	0	Unrestricted
blockCounterCount	int	derived	1	15000	Unrestricted
smoothingTime	float	const	1	30	Unrestricted	msec
smoothingCoeff	float	derived	1	0.0006942	Unrestricted
sineTable	float*	state	0	[200 x 1]	Unrestricted

Pins

Input Pins

Name: in1

Description: audio input

Data type: float

Channel range: Unrestricted

Block size range: Unrestricted

Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out1

Description: audio output

Data type: float

MATLAB Usage

File Name: timeout_module.m

 M = timeout_module(NAME, NUMPINS)
 General purpose Timeout module. Module waits for TimeOut seconds and then once
 the timeout is reached the output will be muted or attenuated or a sine wave 
 depending on the parameter timeOutBehaviour. User can control the timeout level
 through the parameter outputLevel. Arguments:
    NAME - name of the module.
    NUMPINS - number of pins.  Default = 1.

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(8.D.2.2 ) TimeOut

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