DAVID EUGENE SCHMIDT, M.D.
Medical Practice at Interstate Ave, Portland, OR

5939887, Aug 17, 1999

Sep 5, 1997

8/924753

David W. Schmidt - Portland OR
Gerald S. Harris - Portland OR

Tektronix, Inc. - Wilsonville OR

G01R 2726, H04B 1700

324628

A method for measuring interference in a cable transmission system includes the step of establishing a spectrum frequency measurement window having start and stop frequencies and an amplitude threshold. Data is acquired over the window representative of the spectral energy of the cable transmission system within the window and the data is compared against the threshold value. If the data falls below the threshold value, indicating the absence of a carrier signal within the window, a display is generated characterizing the interference over the window. Additional measurement windows may be established having different start and stop frequencies and thresholds for measuring different portions of the cable transmission system frequency spectrum.

7920990, Apr 5, 2011

Jul 16, 2008

12/174588

Richard B. Nicholls - Portland OR, US
Walter R. Strand - Portland OR, US
Lynne A. Fitzsimmons - Portland OR, US
David W. Schmidt - Portland OR, US
Ronald J. Larrick - Beaverton OR, US

Tektronix, Inc. - Beaverton OR

G01R 23/00, G06F 17/00

702190, 702 68, 702 73, 702 76, 324 7619

Apparatus and methods are provided to allow multiple, possibly overlapping, regions of interest within a frequency spectrum to be defined, and managed. Each of these regions of interest may be selected for further testing or identification. Unselected regions are allowed to collapse into narrow bars so as not to interfere with the selected region. Multiple rows are provided to allow for the definition and selection of overlapping regions of interest. Furthermore, in some embodiments aid is provided for identifying the signal type by providing a list of signal type candidates based upon such parameters as region of interest bandwidth, region of interest center frequency and geographic location.