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:
Nov. 22, 1988
Filed:
Oct. 27, 1986
Shin'Ichi Koike, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A quadriphase phase modulation system having a serial to parallel converter for converting first symbols of two-bit serial data into second symbols of two-bit parallel data, a circuit for generating waveform information in response to the second symbols, a memory for storing basic waveforms and a connection waveform and for reading out basic and connecting waveforms in response to the received waveform information. The basic waveform information is selected on the basis of the present waveform information and the connecting waveform is selected on the basis of the present waveform information and the immediately preceding waveform information. A digital to analog converter converts the basic and connecting waveforms output by the memory means into an analog signal.