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:
Jan. 06, 1987
Filed:
Jun. 25, 1985
John C Tate, Garland, TX (US);
Eric K Weeren, Carrollton, TX (US);
General Electric Company, King of Prussia, PA (US);
Abstract
A demodulating apparatus receives a differential phase shift keyed analog signal which is coupled to the input of a voltage controlled oscillator. The voltage controlled oscillator generates a plurality of pulses at a frequency which is proportional to the amplitude of the analog signal. The pulses are counted during in-phase intervals and intervals which are quadrature phase related to the in-phase intervals. The signs of the differences between (i) the number of in-phase and quadrature phase interval pulses counted during a first bit rate interval and (ii) a reference pulse count number, are determined. The signs of the differences between (i) the in-phase and quadrature phase pulses counted during a second bit rate interval, which follows the first bit rate interval, and (ii) the reference count number, are also determined. A phase change is indicated when the signs of the second in-phase and quadrature phase differences are different from the signs of the first in-phase and quadrature phase differences respectively.