Telecommunications – Receiver or analog modulated signal frequency converter – With wave collector
Patent
1994-09-29
1996-05-14
Pham, Chi H.
Telecommunications
Receiver or analog modulated signal frequency converter
With wave collector
4552761, 455289, 455304, H04B 708
Patent
active
055176860
ABSTRACT:
An FM stereo receiving system and a method for aligning phases of RF signals received by multiple antennas. The FM stereo receiving system includes two antennas for receiving RF signals having a common frequency but potentially different phases. The system also includes an FM receiver having a detector output and a pilot output on which a pilot tone, such as a 19 kHz pilot tone, is present. A summer is included in the system for summing the RF signals and providing the summed signal to the receiver. The amplitude modulator of the system resides between one of the antennas and the summer to amplitude modulate the antenna's RF signal at a perturbation frequency which is a whole number multiple greater than 1 of the pilot tone. The receiver thus produces on its phase detector output a phase signal having a frequency equal to the perturbation frequency and a magnitude corresponding to the phase error between the RF signals which is connected in a feedback loop to align the phases.
REFERENCES:
patent: 2951152 (1960-08-01), Sichak et al.
patent: 5204979 (1993-09-01), Schenkyr et al.
Kennedy Richard A.
Koch Barry F.
Delco Electronics Corporation
Funke Jimmy L.
Pham Chi H.
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