Frequency difference detection apparatus and method,...

Details Frequency difference detection apparatus and method,... Frequency difference detection apparatus and method,...

2005-06-14

2011-10-18

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By frequency

C327S039000, C327S040000, C327S042000, C348S500000, C348S505000, C348S536000, C348S537000

Reexamination Certificate

active

08040158

ABSTRACT:
An apparatus having a complex sine wave generating circuit (3) that generates a complex sine wave, a multiplying circuit (4) that multiplies an input signal by the complex sine wave, a first integrating circuit (5) that integrates the product obtained by the multiplying circuit (4) in the time direction, a first squaring circuit (6) that takes the square of the absolute value of a complex signal output by the first integrating circuit (5), a second squaring circuit (7) that takes the square of the absolute value of the instantaneous amplitude of the input signal, a second integrating circuit (8) that integrates the results obtained by the second squaring circuit (7) in the time direction, and a frequency difference calculating circuit (9) that finds the difference between the frequency of the input signal and the oscillation frequency of the complex sine wave on the basis of the ratio between the output signal level of the first squaring circuit (6) and the output signal level of the second integrating circuit (8).

REFERENCES:
patent: 4090145 (1978-05-01), Webb
patent: 4561021 (1985-12-01), Abe
patent: 4594555 (1986-06-01), Hilton
patent: 4847678 (1989-07-01), McCauley
patent: 6172713 (2001-01-01), Morita
patent: 2004/0243329 (2004-12-01), Seki
patent: 0 373 517 (1989-12-01), None
patent: 0 789 466 (1997-08-01), None
patent: 4-503441 (1992-06-01), None
patent: 9-233136 (1997-09-01), None
patent: 10-51802 (1998-02-01), None
patent: 10-174112 (1998-06-01), None
patent: 2004-242324 (2004-08-01), None
patent: 2004-361124 (2004-12-01), None

Affiliated with

Also associated with

Rating

Frequency difference detection apparatus and method,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Frequency difference detection apparatus and method,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Frequency difference detection apparatus and method,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4281775