Method and system for down-converting an electromagnetic signal

H - Electricity – 03 – D

Patent

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Details

H03D 3/00 (2006.01) H03C 1/62 (2006.01) H03D 7/00 (2006.01) H04B 7/12 (2006.01)

Patent

CA 2347078

Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an aliasing rate. The EM signal is abased according to the aliasing signal to down-convert the EM signal. The term aliasing, as used herein, refers to both down converting an EM signal by under-sampling the EM signal at an aliasing rate, and down-converting an EM signal by transferring energy from the EM signal at the aliasing rate. 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 demodulated 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 et des dispositifs permettant de transposer un signal électromagnétique (EM) avec abaissement de fréquence par repliement dudit signal. Schématiquement, ces procédés, systèmes et dispositifs consistent à recevoir un signal EM et un signal de repliement affecté d'un taux de repliement. Le signal EM est transposé avec abaissement de fréquence en fonction du signal de repliement. Le terme de repliement, tel qu'il est utilisé ici, concerne l'abaissement de fréquence d'un signal EM à la fois par sous-échantillonage et par transfert de l'énergie de ce signal selon le taux de repliement. Selon un mode de réalisation, le signal EM est transposé en un signal de fréquence intermédiaire (IF). Selon un autre mode de réalisation, le signal EM est transposé en un signal d'information à bande de base démodulée. Selon un autre mode de réalisation encore, le signal EM est un signal à modulation de fréquence (FM), qui est transposé par abaissement de fréquence en un signal non-FM tel qu'un signal modulé en phase (PM) ou un signal modulé en amplitude (AM).

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