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:
Sep. 29, 1998
Filed:
Dec. 10, 1997
Hiroshi Kushihara, Nagano-ken, JP;
Tamagawa Seiki Kabushiki Kaisha, Nagano-ken, JP;
Abstract
In a conventional digital angle conversion method, constituent parts partially have an analog arrangement, the entire arrangement is not easily made as a monolithic semiconductor, and a low price, a light weight, and high reliability cannot be easily obtained. In addition, high-speed tracking is limited. A digital angle conversion method according to the present invention is a method in which a rotating signal is introduced into a sin.multidot.cos multiplier (2) to obtain a first output signal sin(.theta.-.phi.).multidot.f(t), the first output signal sin(.theta.-.phi.).multidot.f(t) is synchronously rectified to remove an exciting component f(t) so as to obtain a second output signal sin(.theta.-.phi.), a digital angle output (.phi.) is obtained by a voltage control oscillator (5) and a one-turn counter (6), and the arrangement of respective sections can be made as a monolithic semiconductor.