BiquadLoading

Overview

Simulates loading of biquad filters

Discussion

This module is used for CPU load testing purposes and implements a large number of cascade Biquad filters. At instantiation time, you specify MAXSTAGES - the maximum number of filter stages that you would like to simulate. Then at run-time you can vary the number of filters running from 1 to MAXSTAGES. This makes the CPU work harder since more filter stages are running. Internally, the module uses a BiquadCascade module to implement the filtering.

Note that if the filter is connected to a multichannel input, then the module implements numChannels * numStages filters. That is, the number of filters is scaled by the number of channels processed. On some processors like the SHARC, you get more efficient processing when operating on multichannel signals.

Module Pack

Advanced

ClassID

classID = 1219

Type Definition

typedef struct _ModuleBiquadLoading
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
INT32 maxStages;                              // Maximum Biquad stages that can be run
INT32 numStages;                              // Number of Biquad stages currently running
awe_modBiquadCascadeInstance *filt; // Cascade of second order Biquad filters} ModuleBiquadLoadingClass;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
maxStages	int	const	0	100	1:100
numStages	int	parameter	0	1	1:100

Pins

Input Pins


Name	in
Description	Audio Input
Data type	float
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real

Output Pins


Name	out
Description	Audio output
Data Type	float

Matlab Usage

File Name: biquad_loading_module.m 
 M = biquad_loading_module(NAME, MAXSTAGES) 
 Module which simulates the loading of N series biquad stages.  The 
 module is used for profiling and demonstrations of the computational 
 capabilities of processors.  Arguments: 
    NAME - name of the module. 
    MAXSTAGES - maximum stages that will be tried (this is used for 
        memory allocation and is set to 100 by default).