Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1995-04-06
1996-05-14
Pham, Chi H.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551642, 4551861, 4551901, 4551922, H04B 116
Patent
active
055176780
ABSTRACT:
A satellite radio receiver obtains signals from a satellite receiving installation comprising one or more frequency converters which may, for example, undergo a frequency drift as a result of temperature variations which cannot be compensated for by an AFC circuit which is located in the satellite radio receiver and which controls a carrier oscillator for carrier regeneration in a demodulator circuit. A local oscillator for a mixer is designed as a PLL local oscillator (44) which can be tuned in large or small increments. The AFC circuit (1) and a synchronizing signal evaluation circuit (40) are coupled to a control circuit (34) so that the PLL local oscillator (44) is tuned: 1) outside the control range of the AFC circuit (1), with a large tuning increment in the case of undetected synchronizing signals, and 2) with a small tuning increment in the case of detected synchronizing signals, until the control range of the AFC circuit (1) is reached. The satellite radio receiver is suitable for connection to satellite receiving installations which comprise a plurality of frequency converters and therefore deviate the nominal receiving frequency in a summary fashion, and for private individual installations which, for economic reasons, possess low frequency stability.
REFERENCES:
patent: 4405947 (1983-09-01), Tults et al.
patent: 4763195 (1988-08-01), Tults
patent: 4777657 (1988-10-01), Gillaspie
patent: 4823387 (1989-04-01), Tults
Digital Sound Service for Direct Broadcasting Satellites, Published by the Federal Minister of Research and Technology, Federal Republic of Germany.
Proceedings ICDSC-7, 7th International Conference on Digital Satellite Communications, May 12-16, 1986.
Eilts-Grimm Klaus
Klank Otto
Laabs Jurgen
Deutsche Thomson-Brandt GmbH
Emanuel P. M.
Pham Chi H.
Tripoli J. S.
Wein F. A.
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