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.

Type Definition

CODE

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

CODE

 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).