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. 14, 1976
Filed:
Aug. 27, 1974
Yoichi Sato, Tokyo, JA;
Nippon Electric Company, Ltd., Tokyo, JA;
Abstract
A modulator for quadrature amplitude modulating a carrier signal by a first and a second signal derived from an input analog signal includes an A/D converter for converting the input signal to a digital signal in each clock interval and a circuit for producing an error signal representative of quantization errors of the digital signal in the respective clock intervals. The modulator comprises means for dividing the digital signal into a more and a less significant signal comprising more significant and the remaining digits of the digital signal, means for producing the first signal by arranging the more and less significant signals in succession in each clock interval, and a selectively operable inverter for producing the second signal by arranging the error signal in succession in each clock interval with the error signal left as it is and with its polarity inverted.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile