FM receiver

Details FM receiver FM receiver

2008-02-07

2010-12-28

Vuong, Quochien B (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S067130, C455S339000

Reexamination Certificate

active

07860479

ABSTRACT:
An FM receiver that is suitable for reducing a transmission bandwidth WFof a bandpass filter to remove adjacent-channel interference, and increasing WFto prevent audio distortion. A detection output signal SOUTis inputted to an HPF122when a reception electric field strength signal SM-DCindicates an intermediate or stronger electric field. In a weak electric field, an AC component signal SM-AC, which is extracted from an intermediate signal SIF1prior to detection and which has fewer high-pass noise components than SOUT, is inputted to the HPF122. A control circuit120detects a case as an adjacent-channel interference state when a large amount of high-pass components passes through the HPF122, and reduces WFof an IFBPF70in order to remove adjacent-channel interference. When a small amount of high-pass components is transmitted, WFis increased in order to minimize audio distortion.

REFERENCES:
patent: 4918532 (1990-04-01), O'Connor
patent: 5023939 (1991-06-01), Hori
patent: 5287557 (1994-02-01), Hansen
patent: 5691666 (1997-11-01), Owen
patent: 7177615 (2007-02-01), Ono
patent: 7522896 (2009-04-01), Oshima et al.
patent: 2001/0026597 (2001-10-01), Komiyama
patent: 2005/0020220 (2005-01-01), Gamou
patent: 42 44 630 (1993-07-01), None
patent: 1 379 003 (2004-01-01), None
patent: A-2004-312077 (2004-11-01), None
patent: WO 89/12352 (1989-12-01), None
patent: WO 00/77939 (2000-12-01), None

Affiliated with

Also associated with

Rating

FM receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with FM receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and FM receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4236954