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, 1998
Filed:
Jan. 21, 1997
Franz-Otto Witte, Emmendingen, DE;
Deutsche ITT Industries GmbH, Freiburg, DE;
Abstract
Digital demodulator for a quadrature-modulated signal (sq) which transmits a combination signal by amplitude and phase modulation. A quadrature-signal source provides a digitized in-phase component (I) and a digitized quadrature component (Q) of low frequency. A resolver converts the two components (I,Q) into a magnitude signal (b) and a first phase signal (p1). A first feedback control loop and a second feedback control loop that maintains the slope (mp) of the first phase signal (p1) at the zero value and the time average (pm1) at the zero phase position, whereby a third phase signal (p3) is formed. From the resulting signals (b, p3, p3') a decoder forms at least one of the required components (R,L,P).