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:
Feb. 22, 1977
Filed:
Sep. 11, 1975
Yukinobu Ishigaki, Yamato, JA;
Kiyotake Fukui, Settsu, JA;
Matsushita Electric Industrial Co., Ltd., Kadoma, JA;
Victor Company of Japan, Limited, Yokohama, JA;
Abstract
An angle modulation system comprises a voltage controlled oscillator, and at least one frequency divider for dividing the frequency of the output of the voltage controlled oscillator. A phase comparator responds to the output of the frequency divider and to a reference signal supplied from a reference signal oscillator, through another frequency divider. A frequency selection circuit is provided in the path extending from the output side of the voltage controlled oscillator, through the frequency divider, to the phase comparator. This selection circuit eliminates an undesired side band component in the output of the voltage controlled oscillator and derives a required carrier component. An adder adds an input modulation signal and the output of the phase comparator, and applies the resulting signal to the voltage controlled oscillator. From the output of the voltage controlled oscillator, an angle-modulated wave signal is derived with a large signal to noise ratio and large modulation index.