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:
Jul. 01, 2003
Filed:
Oct. 12, 1998
Stephen Robert Wynn, Lynchburg, VA (US);
Ericsson Inc., Research Triangle Park, NC (US);
Abstract
Systems for periodically determining and digitally representing the phase and/or frequency of an input signal are disclosed which include a frequency discriminator, a phase discriminator and a control network. The frequency and phase discriminators may be used to periodically sample and estimate, respectively, the frequency and phase of an input analog signal, and these estimates are provided to a control network which calculates an error estimate and adjusts the estimate of the frequency provided by the frequency discriminator based on this estimate of the error. The systems of the present invention may further include means for digitally representing the phase and/or frequency of the input signal, and may also include a frequency-to-phase converter coupled to the output of the control network which converts the adjusted output of the frequency discriminator into a phase value. Associated methods for extracting and digitizing phase and frequency information from an analog input signal are also disclosed.