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:
Feb. 08, 1994
Filed:
Dec. 18, 1992
Takao Kurihara, Tokyo, JP;
Clarion Co., Ltd., Tokyo, JP;
Abstract
A spread spectrum receiving device is disclosed, in which data demodulation is effected in such a way that a received signal is divided into two parts, from which a COS PN code chip signal and a SIN PN code chip signal are obtained; that these chip signals are A/D-converted by means of A/D converters and then given to digital correlators; and that correlation outputs thus obtained are combined to synthesize a final correlation output. Further there are disposed a plurality of steering gates on the input side of the A/D converters. The a/D conversion can be effected in the neighborhood of a point, where the level of PN code chip waveforms is stable, owing to the fact that the steering gates are controlled by control signals obtained by processing the correlation outputs or output of the A/D conversion. In this way it is made unnecessary to raise the sampling frequency for the A/D conversion and to increase the number of stages of shift registers in the digital correlators.