# US 7,610,161 B2 · Wander gamut display

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- Number: US 7,610,161 B2
- Document ID: US7610161B2
- Status: Granted
- Kind: B2
- Application number: 10/428,361
- Filed: 2003-05-01
- Published: 2004-11-25
- Granted: 2009-10-27
- Earliest claimed: 2003-05-01
- Assignees: Tektronix, Inc.
- Inventors: Daniel G. Baker
- Web page: https://patentgrep.com/patent/US7610161B2

## CPC

- H04N 17/00: Diagnosis, testing or measuring for television systems or their details
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A wander gamut display for perturbation analysis is created by determining from a periodic input data signal and a reference clock a frequency offset and frequency drift rate for the input signal. The frequency offset and frequency drift rate are input to respective orthogonal axes of a Cartesian display together with a wander limit bounding box that defines the wander gamut. Values that fall outside the bounding box on the display indicate wander that may result in data errors.

## Claims

### Claim 1

A method of displaying timing perturbation analysis information comprising the steps of:
determining frequency offset and frequency drift rate values by low pass filtering an input signal below a demarcation frequency; and
providing a Cartesian plot of frequency offset versus frequency drift rate, the Cartesian plot including limits for the frequency offset and frequency drift rate values that define a central bounding box.

### Claim 2 (depends on 1)

The method as recited in claim 1 further comprising the step of highlighting values for the frequency offset/drift rate when the values are outside the central bounding box.

### Claim 3 (depends on 1)

The method as recited in claim 1 further comprising the step of recursively updating the values in the Cartesian plot with a set integration time.

### Claim 4 (depends on 1)

The method as recited in claim 1 further comprising the step of accumulating the values in the Cartesian plot until cleared to provide infinite persistence for program quality control testing.

### Claim 5

A method of displaying frequency offset and frequency drift rate data produced by a wander measurement instrument comprising the steps of:
calculating the frequency offset and frequency drift rate data by low pass filtering an input signal below a demarcation frequency; and
displaying the frequency offset and frequency drift rate data on a Cartesian plot of frequency offset versus frequency drift rate, the Cartesian plot including limits for the frequency offset and frequency drift rate values that define a central bounding box.

### Claim 6 (depends on 1)

A wander measurement instrument having a display according to the method of claim 1.