Method for down-converting an electromagnetic signal

H - Electricity – 03 – D

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H03D 7/00 (2006.01) H03D 3/00 (2006.01)

Patent

CA 2370100

Methods, systems, and apparatuses, and combinations and subcombinations thereof, for down-converting an electromagnetic (EM) signal are described herein. Briefly stated, in embodiments the invention operates by receiving an EM signal and recursively operating on approximate half cycles (1/2, 1 , 2 , etc.) of the carrier signal. The recursive operations can be performed at a sub-harmonic rate of the carrier signal. The invention accumulates the results of the recursive operations and uses the accumulated results to form a down-converted signal. In an embodiment, the EM signal is down-converted to an intermediate frequency (IF) signal. In another embodiment, the EM signal is down-converted to a baseband information signal. In another embodiment, the EM signal is a frequency modulated (FM) signal, which is down-converted to a non- FM signal, such as a phase modulated (PM) signal or an amplitude modulated (AM) signal.

La présente invention concerne des procédés, des systèmes, des appareils et des combinaisons et sous-combinaisons de ces derniers, qui permettent de convertir et abaisser un signal électromagnétique (EM). En résumé, dans des modes de réalisation, l'invention reçoit un signal EM et effectue des opérations récurrentes sur des demi-périodes approximatives (1/2, 1 1/2,2 1/2, etc.) du signal de porteuse. Les opérations récurrentes peuvent être effectuées à une fréquence sous-harmonique du signal de porteuse. L'invention accumule les résultats des opérations récurrentes et utilise les résultats accumulés pour former un signal abaissé. Dans un mode de réalisation, on convertit et abaisse le signal EM en un signal de fréquence intermédiaire (FI). Dans un autre mode de réalisation, on convertit et abaisse le signal EM en un signal d'information dans la bande de base. Dans encore un autre mode de réalisation, le signal EM est un signal modulé en fréquence (FM), qui est converti et abaissé en un signal non FM, tel qu'un signal modulé en phase (PM) ou un signal modulé en amplitude (AM).

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