US 9,118,528 B2
Method and system for down-converting an electromagnetic signal, and transforms for same, and aperture relationshipsGeneral
US 9,118,528 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:
2646 Telecommunications: Analog Radio Telephone; Satellite and Power Control; Transceivers, Measuring and Testing; Bluetooth; Receivers and Transmitters; Equipment Details
Agent:
Inventors:
Michael J. Bultman; Richard C. Looke; Gregory S. Rawlins; David F. Sorrells; Robert W. Cook; Charley D. Moses; Michael W. Rawlins
Assignee:
Priority:
10/21/98
Filed:
02/04/14
Granted:
08/25/15
Expiration:
09/30/19
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)
H04H04L27/2672H04B1/0025H04LH03D7/1441H03C1/62H03D