RM0020 datasheet(43/69 Pages) STMICROELECTRONICS

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RM0020

Function API

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ALIGN_DCC(4)

short x[8] ALIGN_MWERKS(4) = {6554,10393,269,12670,2496,6233,9945,-

303};

short y[8]

= {8192,-6113,3558,4066,-4590,10723,-

3612,6019};

/* #pragma and ALIGN macros used to align to 4 bytes */

#ifdef __ghs__

#pragma alignvar (4)

#endif

ALIGN_DCC(4)

short r [8] ALIGN_MWERKS(4);

unsigned short M, N;

void main(void)

{

/* compute correlation of x and y */

N = 16;

M = 16;

corr_frac16(N, M, x, y, r);

}

6.22

fir_float - float FIR filter

Function call:

void fir_float (unsigned short N, unsigned short ntaps, float *x,

float *y, float *h);

Arguments:

Description:

Computes the real FIR filter on float data. The input samples are stored in the array x,

output samples are written to the array y.

Table 22.

fir_float arguments arguments(1)

The arrays x, y, h must be double-word aligned. There must be 8 bytes of readable memory behind

the arrays h and x.

length of output array y (must be multiple of 2)

ntaps

number of filter coefficients (must be >= 4)

xin

array of input samples of length N+ntaps-1, x(-ntaps+1) x(-ntaps+2)

... x(0) x(1) ... x(N-1)

out

array of output samples of length N, y(0) y(1) ... y(N-1)

hin

array of filter coefficients stored in reversed order, h(ntaps-1) ... h(1)

h(0)

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