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. 26, 1976
Filed:
May. 29, 1975
Ritsu Katsuoka, Okazaki, JA;
Hisasi Kawai, Toyohashi, JA;
Nippon Soken, Inc., Nishio, JA;
Abstract
A digital logarithmic function generator comprising a converter circuit for producing an output signal which is proportional to the number of input signals, a setting circuit the content n of which is changed each time the output voltage of said converter circuit changes by a fixed amount Vo, and a modulator circuit for frequency modulating a clock signal train of a constant frequency with said content n to produce an output signal train the period of which varies proportionally with 2.sup.nVo, the output signal train of said modulator circuit being applied to said converter circuit as the input signal thereto. The present digital logarithmic function generator is useful in various control systems, such as an electronically controlled fuel injection system, in which an electrical signal which is logarithmically related to time is required.