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. 22, 1993
Filed:
Aug. 13, 1991
Jurgen Kasser, Diekholzen, DE;
Robert Bosch GmbH, Stuttgart, DE;
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.