Apparatus for estimating the square of digital samples

Details Apparatus for estimating the square of digital samples Apparatus for estimating the square of digital samples

1986-03-26

1988-11-22

Harkcom, Gary V.

Boots, shoes, and leggings

G06F 738

Patent

active

047870567

ABSTRACT:
Apparatus for estimating the square of a multi-bit digital sample having a value (A+B) segments the sample into a most significantf bit (MSB) portion having the value A, and a least significant bit (LSB) portion having a value B. The LSB portion is added back to the sample to produce a sample having a value of (A+2B), which sample is applied to the multiplicand input of a multiplier circuit. The MSB portion of the sample is coupled to the multiplier input of the multiplier circuit which produces the product (A.sup.2 +2AB) as an estimate of the square of the sample. Estimating the square in this manner significantly reduces the size of the multiplier circuit.

REFERENCES:
patent: 3749898 (1973-07-01), Logan
patent: 4158889 (1979-06-01), Monden
patent: 4598382 (1986-06-01), Sato
Oberman, Digital Circuits for Binary Arithmetic, John Wiley & Sons, New York, pp. 169-177, 1979.
Leslie B. Tyler et al, A Companding System for Multichannel TV Sound, IEEE Trans., On Consumer Electronics, vol. CE-30, No. 4, 11/84, pp. 633-640.
Office of Science and Technology, Bulletin No. 60.
V. Cappellini et al, Digital Filters and Their Application, Academic Press, New York, 1978, pp. 243-245.

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