H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 1/04 (2006.01) H03C 3/09 (2006.01) H03J 7/04 (2006.01) H04B 17/00 (2006.01)
Patent
CA 2182710
In a transmitter (100), circuitry is employed to automatically calibrate errors in a modulated carrier signal. A generator (320) is activated to generate (510) a low frequency square wave for use as data, which is used to generate a modulating signal from which the modulated carrier signal is generated. The modulated carrier signal is down-converted to an intermediate frequency (IF) signal having a steady state IF signal level. The instantaneous IF signal level is compared (545) to the steady state IF signal level to determine (550) whether the instantaneous IF signal level differs from the steady state IF signal level by greater than a predetermined amount, and, when the instantaneous IF signal level differs from the steady state IF signal level by greater than the predetermined amount, the modulating signal is adjusted (560).
Dans un émetteur (100), on utilise des circuits chargés d'étalonner automatiquement des erreurs présentes dans un signal porteur modulé. Un générateur (320) est mis en service pour produire (520) une onde carrée à basse fréquence utilisée en guise de donnée et servant à produire un signal de modulation à partir duquel est émis un signal porteur modulé. Ce dernier est abaissé à un signal de fréquence intermédiaire (FI) présentant un niveau de signal FI à régime permanent. Le niveau de signal FI instantané est comparé (545) au niveau de signal FI à régime permanent pour déterminer (550) s'ils diffèrent de plus qu'une valeur déterminée, auquel cas le signal de modulation subit un réglage (560).
Christian Paul
Karczewski Casimir
Gowling Lafleur Henderson Llp
Motorola Inc.
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