SDKZSPF LSI, SDKZSPF Datasheet - Page 346

• Manufacturer Part Number: SDKZSPF
• Manufacturer: LSI

Specifications of SDKZSPF

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E.11 API Specification for 256 point FFT Library Function on
E.11.1 256 point FFT
E-14
G2
Synopsis
void lib_FFT256(short *in_data, short *out_data, *twiddles)
void lib_iFFT256(short *in_data, short *out_data, *twiddles)
Input
Short *in_data
Short *twiddles
Return
None
Output
Short *out_data
Description
This function implements a 256 point complex, Radix-2, decimation-in-
time Fast Fourier Transform (FFT) algorithm.
Dependencies/Assumptions
The input and output data are to be stored as Im,Re,Im,Re... and are in
natural order.
The input and output data is in Q.15 format.
Twiddle factors have to be recalculated and stored in memory.
Signal Processing Library
Copyright © 1999-2003 by LSI Logic Corporation. All rights reserved.
Pointer to input data
Array of Twiddle factors
Computed FFT or iFFT values