Time reversal gaussian approximation filter

Details Time reversal gaussian approximation filter Time reversal gaussian approximation filter

1992-06-01

1994-08-09

Smith, Jerry

Boots, shoes, and leggings

36472417, G06F 1531

Patent

active

053372646

ABSTRACT:
A time reversal filter uses exponential decay infinite impulse response filters to achieve an approximation to a true Gaussian low pass filter. In one embodiment, a time reversal Gaussian approximation filter performs the forward and backward passes of a time reversal filter in essentially one pass using a segmented signal approach. The input signal is divided into segments, each segment is filtered first in the forward direction, then in the reverse direction, and the segments thus filtered are reassembled to form the output signal. In addition, the overlap in the reverse direction from each filtered segment extending backward into the prior filtered segment is preserved in memory and added to the output of reassembled segments.

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Jose M. Costa, Design of Circularly Symmetric Two-Dimensional Recursive Filters--IEEE Transactions on Acoustics, Speech and Signal Processors vol. ASSP-22 No. 6 Dec. 1974.

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