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:
Sep. 28, 2010
Filed:
May. 02, 2007
Arie Gur, Kiriat Uno, IL;
Israel Greiss, Raanana, IL;
Arie Gur, Kiriat Uno, IL;
Israel Greiss, Raanana, IL;
D.S.P. Group Ltd., Herzliya, IL;
Abstract
The method provides a method and device for detecting in a single or multi frequency signal, one or more frequencies from a predetermined set of frequencies. The Signal is subjected to a complex filter substantially passing all of the frequencies in the predetermined set of frequencies. For each of one or more pairs of members of the complex filtered signal, a complex number Yis determined having a phase indicative of a phase difference between the two members of the pair. The one or more frequencies are then determined based upon the one or more complex numbers. The method and device of the invention may be used in an apparatus such as a call indicator (CI) detector or a DTMF detector.