The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 06, 1987
Filed:
Dec. 31, 1984
Applicant:
Inventors:
Jeffrey P Mills, Oak Park, IL (US);
Max S Macrander, Warrenville, IL (US);
Assignee:
GTE Communication Systems Corporation, Northlake, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F / ; G06F / ;
U.S. Cl.
CPC ...
364768 ; 364748 ;
Abstract
A circuit adds and subtracts pulse code modulation (PCM) samples in D2 format. An exponent subtractor determines the difference between exponents of the two PCM samples. A mantissa shifter circuit shifts the mantissa portion of a selected PCM sample to compensate for the difference in the exponents. A mantissa adder circuit adds or subtracts the mantissa portion of the shifted and unshifted PCM samples and a sign generator provides a sign value representative of the resultant added or subtracted PCM samples. A normalizer circuit ensures that the mantissa has a predetermined range of values.