Channel selecting method and highspeed scanning radio receiver w

Details Channel selecting method and highspeed scanning radio receiver w Channel selecting method and highspeed scanning radio receiver w

1993-12-06

1995-08-01

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

4551651, 4551661, 4551681, 4551831, 4551841, 4551881, 455208, H04B 1702

Patent

active

054386888

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.

REFERENCES:
patent: 4092594 (1978-05-01), Baker
patent: 4603438 (1986-07-01), Filliman
patent: 4870492 (1989-09-01), Hakamada et al.
patent: 5020142 (1991-05-01), Shirasaka

Affiliated with

Also associated with

Rating

Channel selecting method and highspeed scanning radio receiver w does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Channel selecting method and highspeed scanning radio receiver w, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Channel selecting method and highspeed scanning radio receiver w will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-739776