SDKZSPF LSI, SDKZSPF Datasheet - Page 344

• Manufacturer Part Number: SDKZSPF
• Manufacturer: LSI

Specifications of SDKZSPF

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E.10 API Specification for Real Block FIR Library Function on
E.10.1 Real Block FIR
E-12
G2
Synopsis
void lib_realblockfir(*FIR)
*RBF_CFG_Type
Input
int *x
int *h
int N
int T
Output
int *y
int *delay_line
int *delay_current
Description
This function implements a real valued block FIR filter. The N samples
of input array (“x”) are filtered with T filter coefficients in array (“h”), and
the result is stored in array (“y”).
The input, output, and filter coefficients are 16-bits. The filter coefficients
must be stored in reverse order h(T-1) ... h(0).
A delay line is used to hold the history of input data and it is updated
each time to contain the latest T samples and point to the oldest of them.
Signal Processing Library
Copyright © 1999-2003 by LSI Logic Corporation. All rights reserved.
Address of input array, length>=N.
Address of coefficients, length>=T.
Coefficients stored in reverse order h(T-1) ... h(0).
Number input samples in x to filter.
N must be multiple of 4.
Number of filter taps (length of h).
T must be multiple of 4 and T>=8.
Pointer to a configuration type structure
Address of output array, length>=N
Base address of delay line
Ptr to current addr in delay line (oldest sample)