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:
Mar. 28, 1989
Filed:
Jul. 13, 1987
Isao Shimizu, Kanagawa, JP;
Katsunori Miyatake, Kanagawa, JP;
Shuji Urabe, Kanagawa, JP;
Kazuaki Murota, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
Local frequency which is subject to fluctuate in a mobile subscriber set is locked to stable transmit frequency of a base station. A mobile subscriber set (FIG. 3) for angle modulated signal has a frequency mixer (3.6, 3.9), for converting wireless receive frequency to an intermediate frequency by using local frequency (F.sub.L1, F.sub.L2), a limiter (3.11) for limiting amplitude of intermediate frequency signal, a discriminator (3.12) for demodulating angle modulated signal, a standard oscillator (3.1) by using a quartz crystal oscillator and a synthesizer (64) for providing local frequency for said mixer (3.6), a digital frequency counter (3.14) for measuring intermediate frequency, and control means (3.16) for adjusting said standard oscillator (3.1) depending upon error of intermediate frequency measured by said counter (3.14).