Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2011-03-22
2011-03-22
Ngo, Chuong D (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
C708S319000
Reexamination Certificate
active
07912884
ABSTRACT:
A finite impulse response filter is implemented as a sum of individual component, running-sum filters. The sum of all of the component filters required for a desired filter response is calculated in an accumulator and only the component filters' update terms, which are the difference between a new and an old discarded sample, is calculated for each component filter. A desired impulse response is decomposed into a sum of rectangular impulse responses of equal height, each of which implemented as a running sum requiring a subtraction and an addition. Using circuits running at a multiple of the sampling clock, multiple running sums may be implemented on the same hardware. A whole filter of arbitrary impulse response shapes and lengths may be implemented using memory and two arithmetic units. Two or more such filters may be cascaded to obtain a better approximation of the desired frequency characteristic. The invention saves significant chip resources and manufacturing costs.
REFERENCES:
patent: 4736448 (1988-04-01), Umemura
patent: 2005/0271120 (2005-12-01), Hoctor
Aloka Co., Ltd.
Buckley Maschoff & Talwalkar LLC
Ngo Chuong D
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