FIR Filter Library
mikroBasic PRO for dsPIC30/33 and PIC24 includes a library for finite impulse response (FIR) filter. All routines work with fractional Q15 format.
A finite impulse response (FIR) filter is a type of a digital filter, whose impulse response (the filter's response to a delta function) is finite because it settles to zero in a finite number of sample intervals.
Library Routines
FIR_Radix
| Prototype |
sub function FIR_Radix(dim FilterOrder as word, dim ptrCoeffs as longint,dim BuffLength as word, dim ptrInput as word, dim Index as word) as word |
|---|---|
| Description |
This function applies FIR filter to |
| Parameters |
|
| Returns |
with : N - buffer length
k - current index
|
| Requires |
Nothing. |
| Example |
const BUFFFER_SIZE = 32
const FILTER_ORDER = 20
const COEFF_B as integer[FILTER_ORDER+1] = (
0x0000, 0x0048, 0x0133, 0x02D3, 0x052B, 0x0826,
0x0BA0, 0x0F62, 0x1329, 0x16AA, 0x199A, 0x16AA,
0x1329, 0x0F62, 0x0BA0, 0x0826, 0x052B, 0x02D3,
0x0133, 0x0048, 0x0000
)
dim input as word[BUFFFER_SIZE] ydata ' Input buffer
inext as word ' Input buffer index
...
dim CurrentValue as word
CurrentValue = FIR_Radix(FILTER_ORDER+1, ' Filter order
word(@COEFF_B), ' B coefficients of the filter
BUFFFER_SIZE, ' Input buffer length
word(@input), ' Input buffer
inext) ' Current sample
|
| Notes |
Input samples must be in Y data space. |
Copyright (c) 2002-2012 mikroElektronika. All rights reserved.
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