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. 07, 1999
Filed:
Sep. 12, 1997
Takashi Suga, Yokohama, JP;
Yoshihiko Hayashi, Tokyo, JP;
Ryouzou Yoshino, Hadano, JP;
Kenji Nagai, Iruma, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
An arrangement to realize the functions of a radio card system in which power is transmitted to perform data communication. According to such arrangement, a delay line and a clock regenerating circuit such as PLL circuit which are previously necessary for demodulation by PSK are not necessary, and thus functions of data communication are realized by minimum hardware construction, size, cost and power consumption. Further, in a data communication system in which electric power transmission using a signal of a frequency fp and digital data communication using a carrier wave of a frequency fs are performed by radio, fs and fp are in the relationship of fs=fp/N (where N is an integer) and a phase shift P when the phase of the carrier wave is modulated by PSK is (M.times.360.degree.)/N (where M, N are integers and P is preferably not equal to 180.degree.).