Frequency-domain block-adaptive digital filter

Details Frequency-domain block-adaptive digital filter Frequency-domain block-adaptive digital filter

1987-06-03

1989-02-21

Malzahn, David H.

Boots, shoes, and leggings

36472419, G06F 1531

Patent

active

048071730

ABSTRACT:
A frequency-domain block-adaptive digital filter (FDAF) having a finite impulse response of length N for filtering a time-domain input signal in accordance with the overlap-save method includes window means (11) for obtaining modifications (B(p;m)) of the 2N frequency-domain weighting factors (W(p;m)) from correlation products (A(p;m)). A known FDAF of this type contains five 2N-point FFT's, two of which are used in the window means (11). By utilizing a special time-domain window function which can be implemented very efficiently in the window means (11) with the aid of a frequency-domain convolution, a FDAF of this type containing only three 2N-point FFT's is obtained whose convergence properties are comparable to those of the known FDAF containing five 2N-point FFT's.

REFERENCES:
patent: 3883726 (1975-05-01), Schmidt
Clark et al, "A Unified Approach to Time-and Frequency-Domain Realization of FIR Adaptive Digital Filters", IEEE Trans. on Acoustics, Speech, and Signal Processing, vol. ASSP-31, No. 5, Oct. 1983, pp. 1073-1083.
Gritton et al, "Echo Cancellation Algorithms", IEEE ASSP Magazine, Apr. 1984, pp. 30-38.

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