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.

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.