Robert D Bales

US Patent:

20060078311, Apr 13, 2006

Filed:

Oct 12, 2004

Appl. No.:

10/964168

Inventors:

Robert Bales - Portland OR, US

International Classification:

H04N 5/76
H04N 5/225

US Classification:

386117000

Abstract:

A video camera is used to record a picture sequence on a recording medium. A related geographic location signal provided by a GPS receiver is recorded as audio data on the recording medium concurrently with the picture sequence.

US Patent:

48272272, May 2, 1989

Filed:

Jul 15, 1988

Appl. No.:

7/219496

Inventors:

Leonard A. Hayden - Corvallis OR
Robert W. Bales - Portland OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

H03B 712

US Classification:

331179

Abstract:

A step transition time reduction technique for a YIG oscillator having a capacitive filter uses an inverse transfer function to produce a predistorted drive step signal from an input drive step signal, the predistorted drive step signal being used to drive the YIG oscillator. The inverse transfer function uses R,L,C values from the oscillator circuit to generate an intermediate step in the input drive step signal, the value of the step being determined by a factor k=1/(1+e. sup. -a*pi/b) and the duration of the step being determined by a delay time dt=pi/b, where a=R/(2L) and b=(1/(LC)-R. sup. 2 /(4L. sup. 2)). sup. 1/2.

US Patent:

45688788, Feb 4, 1986

Filed:

Mar 19, 1984

Appl. No.:

6/590943

Inventors:

Robert W. Bales - Portland OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G01R 2316

US Classification:

324 77B

Abstract:

Spurious responses generated by operation of a spectrum analyzer are eliminated from the analyzer's display by selecting a feature of the displayed signal for testing, adjusting the analyzer controls to display the feature of interest at the center of the screen and with a predetermined span, adjusting the second L. O. frequency by a predetermined amount, and comparing the amplitude of the signal in the analyzer's storage location corresponding to a point on the screen at a predetermined position different from the center of the screen with the amplitude of the signal previously in the storage location corresponding to the center of the screen. If the comparison does not yield substantial equality, the selected feature is eliminated from the display.

US Patent:

48902373, Dec 26, 1989

Filed:

May 25, 1989

Appl. No.:

7/357629

Inventors:

Robert W. Bales - Portland OR
Lynn T. Olson - Portland OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G01R 2316

US Classification:

364485

Abstract:

A signal processing system for a spectrum analyzer presents a three-dimensional display of a signal in the form of a display of an independent variable, such as frequency, versus a selected property of the signal, such as power, where the selected property is represented as a distribution of values for each independent variable interval in the form of intensity variation on the display. The independent variable is divided into m slots, and the selected property is sampled k times for each slot. A histogram for each slot is built up in a buffer representing the number of samples occurring at each of n power levels. The histogram is transferred to a display memory column by column for each slot, and after all the slots have been processed the display memory is read out onto a display device, such as a CRT, in a raster scan format with the intensity of each pixel element being a function of the number or samples at that power level within that frequency interval.

US Patent:

49183826, Apr 17, 1990

Filed:

Mar 20, 1989

Appl. No.:

7/325845

Inventors:

Robert W. Bales - Portland OR
Joan E. Bartlett - Portland OR

Assignee:

Tektronix, Inc. - Beaverton OR

International Classification:

G01R 2316

US Classification:

324 77B

Abstract:

A method for distinguishing between real and spurious responses in a swept frequency spectrum analyzer in a convenient and on-going way uses sweep data from two different, but equivalent, paths through the spectrum analyzer front end. The setup of the spectrum analyzer front end continuously alternates between the first and second of these setups. A sweep of the spectrum using the first setup is digitized and stored, as well as displayed. The sweep obtained using the second setup is also digitized and stored, as well as displayed. However, at the same time that the current sweep data is being displayed, the stored sweep data from the previous sweep using the other setup is also displayed at the same location on the screen. At anyone time, there are two displays on the screen, overlaid with each other as exactly as possible. The two sweeps are displayed using different intensities or, preferably, using different colors, so that they may be distinguished from each other, and, more importantly, so that regions where they coincide appear different to the operator than regions where they do not coincide, thus permitting easy visual identification of real and spurious signals.