Satellite radio receiver
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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.
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Specification
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Current AssigneeDeutsche Thomson-Brandt Gmbh (Vantiva SA)
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Original AssigneeDeutsche Thomson-Brandt Gmbh (Vantiva SA)
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InventorsEilts-Grimm, Klaus, Klank, Otto, Laabs, Jurgen
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Primary Examiner(s)Pham, Chi H.
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Application NumberUS08/418,901Time in Patent Office404 DaysField of Search455/3.2, 455/164.1, 455/164.2, 455/182.1, 455/182.2, 455/184.1, 455/186.1, 455/190.1, 455/192.1, 455/192.2US Class Current455/182.2CPC Class CodesH03J 1/005 in a loopH03J 7/06 using counters or frequency...H04H 40/90 specially adapted for satel...
