Computationally efficient linear-phase finite impulse response f

Details Computationally efficient linear-phase finite impulse response f Computationally efficient linear-phase finite impulse response f

1994-12-08

1996-08-20

Malzahn, David H.

Boots, shoes, and leggings

36472417, G06F 1710

Patent

active

055485430

ABSTRACT:
A discrete-time filter processes digital signals according to a specified function. It has a linear-phase response if all frequencies experience the same time delay when passing through the filter. In this invention computationally efficient digital filters with linear-phase response are constructed according to a very general and computationally efficient algorithm. The invention also specifies a method for constructing fast truncated infinite impulse response filters with polynomial-times-exponential response. The method may be used to design efficient special purpose filters for numerous dedicated applications, or it may be encoded on a chip to permit the creation in real time of many specific filters according to variable filtering parameters. Applications include fast high-resolution frequency estimation (e.g., for pitch tracking and radar) and fast digital filtering in commercial digital audio systems (e.g., for real-time mixing and equalization of signals and digital loudspeaker crossover networks).

REFERENCES:
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patent: 5373460 (1994-12-01), Marks, II
patent: 5388063 (1995-02-01), Takatori et al.
patent: 5402795 (1995-04-01), Reichl
Kay, "Statistically/Computationally Efficient Frequency Estimation" Proc. ICASSP, pp. 2292-2295, 1988, IEEE Service Center.
Saramaki et al "Properties & Structures of Linear-Phase FIR Filters Based on Switching & Resetting of IIR Filters" Proc. IEEE Int. Symposium on Circuits & System, 1990, pp. 3271-3274.

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