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, 2010
Filed:
Sep. 12, 2002
Yozo Shoji, Tokyo, JP;
Hiroyo Ogawa, Tokyo, JP;
Yozo Shoji, Tokyo, JP;
Hiroyo Ogawa, Tokyo, JP;
Abstract
A transmitter shown in FIG.inputs to a mixeran IF band modulation signal generated from transmission data and a frequency hopping signal obtained by a hopping synthesizercontrolled by a hopping pattern generator, thereby obtaining a frequency hopping radio signal to be transmitted. In a receiver shown in FIG., a received signal is amplified and an unnecessary wave is removed from the signal, and the resultant signal is input to a mixer. The mixerreceives an output signal of a hopping synthesizercontrolled by a signal obtained by adding a fixed frequency offset signal to the hopping pattern generator. A signal downconverted to a first IF band without frequency hopping corresponding to the offset signal with a radio frequency band signal maintaining the relative spectrum relationship appears in the output of the mixer. An unnecessary wave of the signal is removed, a square unitperforms square detection, and a modulation signal in the intermediate frequency band used by the source is regenerated. The obtained IF band signal is modulated, thereby receiving desired data.