Boots – shoes – and leggings
Patent
1986-10-14
1988-05-24
Harkcom, Gary V.
Boots, shoes, and leggings
364752, G06F 738
Patent
active
047470674
ABSTRACT:
Vector magnitude approximating logic using logarithms of the vector's orthogonal components to select multiplier scaling constants and to minimize arithmetic-function and hardware complexity. The apparatus is particularly applicable to a high-throughput, pipelined, digital signal processing application such as radar. The vector magnitude is approximated by multiplying each component of a complex number representing the vector by selected scaling constants and then by summing the two resulting products. The scaling constants are selected by feeding each orthogonal component of the vector into one of two identical logic arrays which determine the base-2 logarithm of the absolute value of each component. The resulting logarithm values are fed, in parallel, into a third logic array which outputs an address to real and imaginary constant read-only memory generators for providing respective scaling constant pairs which are used to compute the approximate magnitude of the vector or complex number representing the vector.
REFERENCES:
patent: 3829671 (1974-08-01), Gathright et al.
patent: 3858036 (1974-12-01), Lunsford
patent: 4481601 (1984-11-01), Heinle
patent: 4599701 (1986-07-01), Vojir et al.
patent: 4692889 (1987-09-01), McNeely
"The CORDIC Trigonometric Computing Technique", by Volder, IRE Transactions on Electronic Computers, Sep., 1959, pp. 330-334.
"Magnitude Approximations for Microprocessor Implementation", by Adams et al., IEEE MICRO, Oct., 1983, pp. 27-31.
Evett Ronald C.
Jagodnik, Jr. Anthony J.
Dawson Walter F.
Harkcom Gary V.
Mai Tan V.
Raytheon Company
Sharkansky Richard M.
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