Downsampler

Overview

Downsampler (or decimator) - keeps 1 out of every D samples

Discussion

Multichannel downsampling module. When downsampling by a factor of D, the module will keep 1 of every D samples, with the other samples being discarded. No filtering is incorporated within the module. It is expected that the user will incorporate the filters of their choice to systems that incorporate downsampling.

Module Pack

Advanced

ClassID

classID = 1261

Type Definition

typedef struct _ModuleDownsampler
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
INT32 D;                                      // Decimation factor. 1 out of every D samples is output.
} ModuleDownsamplerClass;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
D	int	const	0	2	1:1:1024

Pins

Input Pins


Name	in
Description	Input signal
Data type	{float, int, fract32}
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real

Output Pins


Name	out
Description	Output signal
Data Type	{float, int, fract32}

Matlab Usage

File Name: downsampler_module.m 
 M=downsampler_module(NAME, D) 
 Creates a multi-input downsampler module for use in the Audio Weaver 
 environment. This module keeps only 1 out of every D samples. 

 Arguments: 
    NAME - name of the module. 
    D - decimation factor. 

 The decimation factor is set at construction time and cannot be changed 
 during tuning. Note, the decimation factor must evenly divide the 
 block size.