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:
Dec. 06, 1994
Filed:
Sep. 25, 1991
Daniel Marz, Feasteville, PA (US);
Abstract
A method and apparatus are provided for recovering a desired baseband signal from a signal represented by in-phase and quadrature-phase signal components, while automatically correcting phase error present between these signal components. In general, the method of the present invention involves providing to the input of a local signal generating circuit, a first signal representative of the in-phase signal component, and generating therefrom local in-phase and quadrature-phase signals. One of the local in-phase and quadrature-phase signals is phase shifted by a selected amount of phase correction. The local in-phase signal is multiplied by the first signal to produce a first resultant signal. The local quadrature-phase signal is multiplied by the second signal representative of the quadrature-phase signal, to produce a second resultant signal. The first resultant signal and the second resultant signal are then summed so as to produce an output signal representative of the desired baseband signal.