Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Reexamination Certificate
2005-11-10
2010-06-22
Dole, Timothy J (Department: 2831)
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
C324S076110, C324S076230
Reexamination Certificate
active
07741830
ABSTRACT:
The process eliminates image rays generated in a frequency converting device generating actual rays and image rays from frequency rays of an input signal. The frequency converting device comprising a mixer mixing the input signal and a signal provided by a local oscillator and a filter assembly filtering the mixed signals output by the mixer. In a first sweep and a second sweep, the frequency of the oscillator is varied and the signal level at the output of the frequency converting device is recorded for a set of converted frequencies. The second sweep is carried out so that the frequency of the actual ray generated in the second sweep by an input ray is the same as the frequency of the actual ray generated in said first sweep by said input ray, and the frequency of the image ray generated in the second sweep by an input ray is not the same as the frequency of the image ray generated in said first sweep by said input ray. Then, the process determines if a ray-including signal level was recorded both during the first sweep and the second sweep for at least one converted frequency and displays an indication of the presence of a ray for said at least one converted frequency on a screen only if said determination is positive.
REFERENCES:
patent: 4451782 (1984-05-01), Ashida
patent: 4950999 (1990-08-01), Agnello et al.
patent: 6265861 (2001-07-01), Musha
patent: 6861833 (2005-03-01), Miyauchi
patent: 7116092 (2006-10-01), Jenkins et al.
patent: 2004/0041554 (2004-03-01), Miyauchi
U.S. Appl. No. 11/718,486 to Griffault, filed May 2, 2007.
Advantest Corporation
Dole Timothy J
Greenblum & Bernstein P.L.C.
Hoque Farhana
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