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:
May. 31, 1994
Filed:
Dec. 01, 1992
David A Kranzler, Belmont, CA (US);
3COM Corporation, Santa Clara, CA (US);
Abstract
A digital frequency discrimination circuit includes an edge detector coupled to receive a transmission signal for producing an edge detected signal; an edge timer including a shift register clocked by the clock signal and having the edge detected signal as a data input, and a timeout determining subcircuit having a plurality of bits of the shift register coupled as edge detection inputs, for determining and providing a timeout signal indicating whether any of the edge detection inputs represents an edge detection; and a state machine circuit coupled to receive the clock signal, the edge detected signal, and the timeout signal for producing an unsquelch signal indicating whether the transmission signal meets frequency discrimination requirements.