ImpulseMsecSource

Overview

Source module which periodically outputs an impulse. Time specified in msec.

Discussion

This module has a single mono output pin and generates a periodic impulse of value 1; all other output samples are set to 0. The variable .periodMsec specifies the period of the generation process in milliseconds and can be adjusted at run-time.

If .periodMsec = 1.0, then the module generates an impulse every second. If .periodMsec = 0, then the module stops outputting values.

As with all source modules, you have to set the blockSize and sampleRate of the output pin. The module is initialized so that it fires immediately; sample 0 of block 0 is set to 1.0f.

Type Definition

CODE

typedef struct _ModuleImpulseMsecSource
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 periodMsec;                             // Period or rate of the impulse generator (in msec).
    INT32 period;                                 // Period or rate of the impulse generator (in samples).
    INT32 sampleIndex;                            // Specifies the index of the next non-zero value.
} ModuleImpulseMsecSourceClass;

Variables

Properties

Name	Type	Usage	isHidden	Default value	Range	Units
periodMsec	int	parameter	0	1000	0:10000	msec
period	int	derived	1	48000	0:240000	samples
sampleIndex	int	state	1	0	Unrestricted

Pins

Output Pins

Name: out

Description: audio output

Data type: float

MATLAB Usage

File Name: impulse_msec_source_module.m

CODE

 M=impulse_msec_source_module(NAME, BLOCKSIZE, SAMPLERATE)
 Source module which periodically outputs an impulse. An impulse is
 a single non-zero sample of value 1. The period is specified in msec
 and can be adjusted at run-time.  Arguments:
    NAME - name of the module.
    BLOCKSIZE - number of samples per output channel. If empty, then the
         blockSize is taken from the system input pin.  By default,
         BLOCKSIZE = [].
    SAMPLERATE - sample rate of the output signal, in Hz.  If empty, then
         the sample rate is taken from the system input pin.  By default,
         SAMPLERATE = [].