Ronald John Potter

US Patent:

53008782, Apr 5, 1994

Filed:

Nov 19, 1992

Appl. No.:

7/978551

Inventors:

Jay M. Wardle - Seattle WA
Ronald W. Potter - Snohomish WA
John A. Gibbs - Lynnwood WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2316

US Classification:

324 7627

Abstract:

The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

US Patent:

51171791, May 26, 1992

Filed:

Mar 13, 1990

Appl. No.:

7/493590

Inventors:

Jay M. Wardle - Seattle WA
Ronald W. Potter - Snohomish WA
John A. Gibbs - Lynnwood WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2702

US Classification:

324 77CS

Abstract:

The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

US Patent:

54735556, Dec 5, 1995

Filed:

Aug 4, 1994

Appl. No.:

8/286497

Inventors:

Ronald W. Potter - Snohomish WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1710

US Classification:

3647241

Abstract:

A signal processing technique allows accurate interpolation between points of a sampled frequency domain function. A time-based sampling process samples a time waveform of duration T having a sub time interval T'. A signal processor applies a discrete Fourier transform over a time period T to transform the sampled data from the time domain to the frequency domain. The sampled frequency domain data is convolved with one or more convolution kernels to yield a continuous line shape. The result of this convolution permits the spectral composition at arbitrary frequencies to be determined. The disclosed frequency domain interpolation process is characterized by preservation of data in the T' interval of the time domain with an arbitrary but specified degree of accuracy.

US Patent:

52355349, Aug 10, 1993

Filed:

Aug 25, 1991

Appl. No.:

7/722377

Inventors:

Ronald W. Potter - Snohomish WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1531

US Classification:

36472401

Abstract:

A method and apparatus for interpolating between data samples (V. sub. S) that preserves the frequency spectrum of a sampled analog signal (V. sub. O) is provided. Data samples (V. sub. S) are interpolated to produce interpolated values (V. sub. IV) that contain frequency domain information that accurately replicates an original frequency spectrum (24) of the analog signal (V. sub. O) is disclosed. A signal processor (10) reads data samples (V. sub. S) which occur at sampling times (t. sub. S) and resample times (t. sub. R) at which the V. sub. S values are interpolated. A set of t. sub. S times are found near each t. sub. R time. A digital FIR filter having a frequency function (H(fT)) and a continuous impulse response function ##EQU1## is embodied in software form within a program that controls the signal processor (10) where T is the width of the filter impulse response. The signal processor (10) convolves an offset continuous impulse response function ##EQU2## with the V. sub. S values. A plurality of convolved values (V. sub.

US Patent:

54205140, May 30, 1995

Filed:

Feb 7, 1994

Appl. No.:

8/192927

Inventors:

Jay M. Wardle - Seattle WA
Ronald W. Potter - Snohomish WA
John A. Gibbs - Lynnwood WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2316

US Classification:

324615

Abstract:

The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments are obviated by optimizing filter circuitry and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping. Some selective windowing is also used to compensate for distortions due to fast sweep rates.

US Patent:

51682133, Dec 1, 1992

Filed:

Jan 9, 1992

Appl. No.:

7/819147

Inventors:

Jay M. Wardle - Seattle WA
Ronald W. Potter - Snohomish WA
John A. Gibbs - Lynnwood WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G01R 2316

US Classification:

324 77CS

Abstract:

The sweep rate limitations that heretofore have constrained the maximum sweep rates of swept analysis instruments (10,38) are obviated by optimizing filter circuitry (24,32,34,46) and post-processing the IF signal using various techniques to compensate for errors caused by fast sweeping.

US Patent:

49126610, Mar 27, 1990

Filed:

Dec 1, 1987

Appl. No.:

7/127356

Inventors:

Ronald W. Potter - Mill Creek WA

Assignee:

Hewlett-Packard Company - Palo Alto CA

International Classification:

G06F 1546
G01H 100

US Classification:

364550

Abstract:

A tracking and resampling method for monitoring the performance of a rotating machine (10) is disclosed. One or more measuring devices (13) provide rotating machine performance data to a signal processor (14) that samples the performance data at uniform time increments. A digitized waveform of the sampled performance data is interpolated by an interpolation filter. The sampled performance data is convolved with the impulse response of the interpolation filter to provide a continuous time function waveform depicting the rotating machine performance data. The signal processor (14) resamples the continuous time function waveform at uniform rotating shaft phase angle increments.