FIRFract32

Overview

FIR fract32 filter

Discussion

The FIR Fract32 Module implements a direct convolution N-order Finite Impulse Response filter. The module operates on multiple channels with all channels sharing the same set of filter coefficients. coeffs holds the filter coefficients and is of size numTaps x 1. The coefficients are stored in coeffs in normal order. The state variable array is of size numTaps*numChannels.

Module Pack

Standard

ClassID

classID = 142

Type Definition

typedef struct _ModuleFIRFract32
{
ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
INT32 numTaps;                                // Length of the filter
INT32 stateIndex;                             // Index of the oldest state variable in the array of state variables
INT32 postShift;                              // Number of bits to shift
FLOAT32* coeffs;                              // Coefficient array
fract32* coeffsfract32;                       // Coefficient array
fract32* state;                               // State variable array
} ModuleFIRFract32Class;

Variables

Properties

Name	Type	Usage	isHidden	Default Value	Range	Units
numTaps	int	const	0	31	1:1:5000	samples
stateIndex	int	state	1	0	Unrestricted
postShift	int	derived	1	1	Unrestricted
coeffs	float*	parameter	0	[31 x 1]	Unrestricted
coeffsfract32	fract32*	derived	0	[32 x 1]	Unrestricted
state	fract32*	state	1	[68 x 1]	Unrestricted

Pins

Input Pins


Name	in
Description	audio input
Data type	fract32
Channel range	Unrestricted
Block size range	Unrestricted
Sample rate range	Unrestricted
Complex support	Real

Output Pins


Name	out
Description	audio output
Data Type	fract32

Matlab Usage

File Name: fir_fract32_module.m 
 M=fir_fract32_module(NAME, L) 
 Creates an FIR filter object for use in the Audio Weaver environment. 
 The module has a single multi-channel input pin.  Arguments: 
    NAME - name of the module. 
    L - length of the filter (number of taps).