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:
Aug. 01, 1995
Filed:
Dec. 06, 1993
Tateo Masaki, Ichikawa, JP;
Uniden Corporation, Chiba, JP;
Abstract
In a radio receiver for electronically selecting channels by way of the frequency synthesizer system, a highspeed channel scanning operation is realized. A CPU (central processing unit) detects both an SC (squelch control) signal derived from a squelch circuit and an output voltage from a frequency discriminator. The CPU controls data to be supplied to a PLL (phase-locked loop) circuit employed in a frequency synthesizer so as to perform a channel scanning operation scanning three channels concurrently. When the CPU judges that a desirable reception signal is detected based on a change in the SC signals during the concurrent scan operation. This CPU determines at which channel, the scanning operation is stopped among three channels: the central channel of the three channels searched during the concurrent scan operation, a channel higher in frequency than this searched channel by 1 step, and a channel lower in frequency than this searched channel by 1 step. Then, the CPU supplies PLL data corresponding to the channel at which the scanning operation is stopped into the PLL circuit employed in the frequency synthesizer.