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:
Apr. 12, 1988
Filed:
Feb. 17, 1987
Hitachi, Ltd., Tokyo, JP;
Abstract
A digital demodulator for separating and demodulating quadrature modulated signals to produce the inphase components and quadrature components of a baseband through simple digital processing. This digital demodulator is constructed by an A/D converter for sampling received modulated signal so as to be converted into digital signals, means for distributing every other sample signal of the sample signals from said A/D converter into two trains of the sample signals, means for inverting the polarity of every other signal of the one signal train so as to provide the inphase components of the baseband, and means for delaying the other signal sequence by one sampling period and thereafter inverting the polarity of every other signal of the delayed signals so as to provide the quadrature components of the baseband.