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:
Dec. 11, 1990
Filed:
Feb. 21, 1989
Yukinobu Ishigaki, Machida, JP;
Kenichi Mizuno, Yokohama, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
A spread spectrum communication system having a modulation unit for modulating and spreading an information signal by one or more of carrier signals and a spread code and transmitting it as a radio wave, and a demodulation unit for despreading and demodulating a received radio wave to pick up the information signal. The modulation unit includes a synthesizing and modulating unit for synthesizing a first primary modulated signal obtained by modulating a first carrier by the information signal and a second primary modulation signal obtained by modulating a second carrier, and a spectrum spreading unit for spreading the synthesized first and second primary modulation signals with a spread code to generate a spread spectrum signal containing first and second spread signal components. The demodulation unit includes a separation unit for separating a received spread spectrum signal into the first and second spread signals, a spread signal reproduction unit for reproducing the spread code on the separated first and second spread signal component, and a despreading unit for despreading the separated first spread signal component and reproduced spread code to reproduce the information signal.