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:
Jan. 26, 1988
Filed:
Dec. 17, 1985
Hidetoshi Ozaki, Chofu, JP;
Kaoru Kobayashi, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A digital phase difference detecting circuit has a phase shifting circuit for shifting by +90.degree. or -90.degree. a phase of an input signal which has been sampled over a predetermined sampling period, a dividing circuit for dividing an output signal of the phase shifting circuit by the input signal, an operation circuit for performing an inverse trigonometric function operation on an output signal of the dividing circuit, and a subtracting circuit for obtaining the difference between an output signal of the operation circuit and a phase of a reference signal. The resulting output signal of the subtracting circuit indicates the phase difference between the reference signal and the input signal.