Overview

Sparse FIR filter which works together with the DelayStateWriter module

Discussion

This module implements a sparse FIR filter which is also known as a tapped delay line. This module stores only the coefficients and delay times and works in conjunction with an upstram delay_state_writer_module.m. The delay_state_writer_module.m holds the state variables and can be shared by multiple FIRSpareReaderModules.

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The module only outputs a mono channel of data and the output blockSize must be a multiple of 8 samples. This last condition is checked by the module's prebuild function.

Type Definition

typedef struct _ModuleFIRSparseReader
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 numTaps;                                // Number of non-zero coefficients (taps) in the filter
    INT32 dswObjectID;                            // Object ID of the upstream DelayStateWriter module
    INT32* tapDelay;                              // Current delay per tap
    INT32* tapDelayTarget;                        // Current delay per tap
    FLOAT32* tapCoeffs;                           // Coefficient applied to each tap output
    void * dswObjectPtr;                          // Points to the upstream DelayStateWriter module
} ModuleFIRSparseReaderClass;

Variables

Properties

Pins

Input Pins

Name: ID

Description: audio input

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Sample rate range: Unrestricted

Complex support: Real

Output Pins

Name: out

Description: audio output

Data type: float

MATLAB Usage

File Name: fir_sparse_reader_module.m

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