Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1995-06-09
1997-02-11
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
4552261, 4552262, 455 333, 4552771, 4552772, H04B 1702
Patent
active
056031076
ABSTRACT:
An FM radiowave receiver includes a diversity antenna system responsive to signal strength and noise levels. The signal strength and noise detectors generate representative signals that are compared with a threshold value for determining the input to a control for the antenna switch alternately connecting two or more antennas to the front end of the FM receiver. The present invention provides an adaptive threshold for each of the signal strength and noise signals so that the switching is limited to significant changes in signal strength and noise levels. In the preferred embodiment, the noise level threshold is adapted as a function of the modulation level of the audio composite signal delivered from the FM detector to the FM stereo decoder of the receiver.
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"PAC/CDR--14 General Information", Service Manual, 4 pp., 1995.
Burek Mark C.
Gottfried Gordon E.
Ravi Latha
Arthur Gertrude
Eisenzopf Reinhard J.
Ford Motor Company
May Roger L.
Mollon Mark L.
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