US 7,865,177 B2
Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationshipsGeneral
US 7,865,177 B2
Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationships
Tech Center:
2600 Communications
Examiner:
Sam Bhattacharya
Art Unit:
2617 Computer Graphic Processing, 3D Animation, Display Color Attribute, Object Processing, Hardware and Memory
Inventors:
David F. SORRELLS; Michael J. Bultman; Robert W. Cook; Richard C. Looke; Charley D. Moses; Michael W. Rawlins; Gregory S. Rawlins
Assignee:
Priority:
10/21/98
Filed:
01/07/09
Granted:
01/04/11
Expiration:
02/11/19
Abstract
Methods, systems, and apparatuses, and combinations and sub-combinations 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 (½, 1½, 2½, 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.
Cooperative Patent Classification (CPC)
H03H03D7/00H03D