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. 28, 1976
Filed:
Sep. 03, 1974
Nobuaki Takahashi, Yamato, JA;
Kazunori Nishikawa, Fujisawa, JA;
Yoshiki Iwasaki, Yokohama, JA;
Masaaki Satoh, Yokohama, JA;
Katsuhiro Ohba, Yokohama, JA;
Shinji Nakamura, Minami-ashigara, JA;
Tatsuo Sawada, Sagamihara, JA;
Nobuhide Ohsaki, Yokohama, JA;
Yasuo Itoh, Tokyo, JA;
Nobuaki Suda, Yamato, JA;
Yasuhisa Okabe, Zama, JA;
Hideaki Ozaki, Sagamihara, JA;
Victor Company of Japan, Limited, Yokohama, JA;
Abstract
An angle modulated wave demodulation system demodulates an input angle modulated wave by means of a phase locked loop system which comprises a phase comparator, which is operated responsive to an input angle modulated wave. A voltage controlled oscillator is supplied with a part of the output of the phase comparator which controls its oscillation frequency. The oscillator supplies its oscillation frequency to the phase comparator. The phase locked loop system has a lock frequency range which decreases its width when the level of the input angle modulated wave is below a predetermined level. The portion of this lock range in which the width of the lock range decreases is positively utilized. The voltage controlled oscillator oscillates at a frequency equal to the center frequency of the carrier of the input angle modulated wave, when the phase locked loop becomes unlocked.