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:
Jun. 16, 1992
Filed:
Dec. 18, 1990
Hideho Tomita, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A differential phase demodulator for demodulating a PSK-modulated signal including a zero-cross detector for detecting zero-cross points of intermediate frequency signals of the PSK-modulated signal and generating a zero-cross detection signal; a synchronization circuit for synchronizing an externally supplied baud timing signal with the zero-cross detection signal; an oscillator for generating clock pulses; a counter for counting the clock pulses and producing a pulse count; a phase difference detector for calculating the count per period of the synchronized baud timing signal and outputting the result as the phase difference data; and a decision circuit for outputting demodulated data based on the phase difference data.