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

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

Pins

Input Pins

Name: in

Description: Audio Input

...

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

...