o_195h4n6al16jb186b1b2qs7fgssa.pdf

Oppenheim and
Ronald Schafer’s Discrete-Time Signal Processing, Prentice Hall, 1989. For
implementation details of Least Mean Square FIR filters, please refer to T.
Hsia’s Convergence
Analysis of LMS and NLMS Adaptive Algorithms, Proc. ICASSP, pp. 667-670,
1983, as
well as Sangil Park and Garth Hillman’s On Acoustic-Echo Cancellation
Implementation with Multiple Cascadable Adaptive FIR Filter Chips, Proc.
ICASSP,
1989.
FIRStruct
Structure: FIRStructdescribes the filter structure for any of the FIR filters.
Include: dsp.h
Declaration: typedef struct {
int numCoeffs;
fractional* coeffsBase;
fractional* coeffsEnd;
int coeffsPage;
fractional* delayBase;
fractional* delayEnd;
fractional* delay;
} FIRStruct;
Parameters: numCoeffs number of coefficients in filter (also M)
coeffsBase base address for filtercoefficients (also h)
coeffsEnd end address for filter coefficients
coeffsPage coefficients buffer page number
delayBase base address for delay buffer
delayEnd end address for delay buffer
delay current value of delay pointer (also d)
Remarks: Number of coefficients in filter is M.
Coefficients, h[m], defined in 0 ≤m