Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Patent
1991-08-13
1993-06-22
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
4552261, 455296, 455297, H04B 1700
Patent
active
052222527
ABSTRACT:
An improved FM car radio includes a recognition circuit for detecting intermittent multipath reception from the audio frequency signal, rather than from the intermediate frequency signal, as in prior art detectors. The output signal of the stereo decoder 6 is fed to a recognition circuit containing a 90.degree. phase shifter 14, a multiplier circuit 15, a low-pass filter 16, a rectifier 17, and another low-pass filter 18. The resulting output signal U.sub.q is a measure of the quality of the signal, and can be used to initiate re-tuning to an alternate transmitter. For faster response, the recognition circuit can include a second signal path and a quotient former stage 23, resulting in an output signal U.sub.q *. Either U.sub.q or U.sub.q * is fed back to a threshold value stage 19 for evaluation.
REFERENCES:
patent: 4225751 (1980-09-01), Hershberger
patent: 4323731 (1982-04-01), Hershberger
patent: 4454607 (1984-06-01), Ogita
patent: 4524446 (1985-06-01), Sun et al.
patent: 4538285 (1985-08-01), Gielis et al.
patent: 4606048 (1986-08-01), Sasaki et al.
Eisenzopf Reinhard J.
Keough Timothy H.
Robert & Bosch GmbH
LandOfFree
Stereo radio receiver multipath disturbance detection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Stereo radio receiver multipath disturbance detection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Stereo radio receiver multipath disturbance detection circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1446811