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. 24, 1986
Filed:
Oct. 12, 1984
Uniden Corporation, Ichikawa, JP;
Abstract
A selective call signal detection circuit comprises a channel free/busy state detection circuit for scanning a plurality of communication channels to determine their respective free/busy states, a present-time channel free/busy state memory circuit for temporarily storing channel free/busy detection signals resulting from the aforementioned scanning of communication channels, a past-time channel free-busy state memory circuit for receiving into storage therein in the subsequent channel scanning cycle the channel free/busy detection signals of the previous scanning cycle formerly stored in the aforementioned present-time channel free/busy state memory circuit, and a comparison circuit for comparing the signals from the aforementioned present-time past-time channel free/busy state memory circuits thereby discriminating between a selective call signal addressed to a given receiving station and selective call signals addressed to other receiving stations. Since this selective call signal detection circuit permits quick discrimination between a channel in the state of normal communication and a channel in the state of selective call, it serves to enhance the efficiency of channel scanning.