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:
Apr. 16, 1985
Filed:
Mar. 25, 1982
David Caldwell, Lubbock, TX (US);
Mahendra P Agrawal, Lubbock, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
A data processing apparatus employs a single key stroke for defining a complex number entry and for designating a particular complex number calculation mode. Entry of a complex number follows the following format: entry of the first part of the complex number, entry of a complex number mode designation command, and entry of the second part of the complex number. Entry of the complex number mode designation command designates the numeric data to be assigned the first part and the second part of a complex number and also causes the data processing apparatus to enter a corresponding complex number computation mode. Thereafter, upon entry of at least some of the normal operational commands of the data processing apparatus, these operational commands are performed upon the previously entered complex numbers in accordance with the mathematical laws of complex number arithmetic. The data processing apparatus preferably generates an indication of when a complex number computation mode has been set. Display of the two parts of a complex number is facilitated by an exchange operational command which exchanges the first and second parts of the complex number so that the other part of the complex number may be displayed. In a further preferred embodiment, complex numbers may be stored and recalled from pairs of user accessible memories in a manner similar to the normal operations on real numbers.