Measuring device, graphics generating method, program and recording medium

• US 7,859,534 B2
• Filed: 03/24/2005
• Issued: 12/28/2010
• Est. Priority Date: 03/24/2005
• Status: Expired due to Fees

• Current Assignee: Advantest Corporation
• Original Assignee: Advantest Corporation
• Inventors: Fujii, Yasuo
• Primary Examiner(s): Yang; Ryan R
• Application Number:
  US11/909,322
• Publication Number:
  US 20080252644A1
• Time in Patent Office: 2,105 Days
• Field of Search: 345/440, 345/440.1, 345/440.2, 702/67
• US Class Current: 345/440
• CPC Class Codes: G01R 13/02 for displaying measured electric variables in digital form
• CPC Class Codes: H04L 1/205 jitter monitoring

Abstract

There is provided a measuring device including an EVM measuring unit 32 which measures, in association with time, a physical quantity (EVM) of an RF signal, which uses different frequency bands according to time, a used band determining unit 36 which determines the type of the frequency band used by the RF signal in association with time, an EVM graph generating unit 42 which generates an EVM graph used to display an EVM on a display device 49 in association with a time axis, and a band graph generating unit 46 which generates a band graph used to display the type of the frequency band on the display device 49 in association with the time axis, where the band graph is a graphic having a predetermined height in a direction vertical to the time axis.

Claims

1. A measuring device comprising:

a physical quantity measurer that measures, in association with time, a physical quantity of a signal, which uses different frequency bands according to time;

a band type determiner that determines the type of the frequency band used by the signal in association with time;

a physical quantity display graphic generator that generates a physical quantity display graphic used to display the physical quantity on a display device in association with a time axis; and

a band display graphic generator that generates a band display graphic used to display the type of the frequency band on the display device in association with the time axis,

wherein the band display graphic is a graphic having a predetermined height in a direction perpendicular to the time axis.

2. The measuring device according to claim 1, wherein the band display graphic is different in color or pattern according to the type of the frequency band.

3. The measuring device according to claim 1, wherein the physical quantity is an EVM or a phase error.

4. The measuring device according to claim 1, wherein a symbol of the signal is displayed on the time axis.

5. The measuring device according to claim 1, wherein the physical quantity display graphic is formed by connecting display point whose distance from the time axis corresponds to the physical quantity.

6. The measuring device according to claim 1, wherein the predetermined height of the band display graphic corresponds to the physical quantity.

7. The measuring device according to claim 1, wherein the predetermined height of the band display graphic is constant.

8. The measuring device according to claim 1, wherein the band display graphic is displayed only for a specific frequency band.

9. A measuring method comprising:

measuring, in association with time, a physical quantity of a signal, which uses different frequency bands according to time;

determining the type of the frequency band used by the signal in association with time;

generating a physical quantity display graphic used to display the physical quantity on a display device in association with a time axis; and

generating a band display graphic used to display the type of the frequency band on the display device in association with the time axis,

wherein the band display graphic is a graphic having a predetermined height in a direction perpendicular to the time axis.

10. A computer-readable medium having a program of instructions for execution by the computer to perform a measuring processing;

said measuring processing comprising;

measuring, in association with time, a physical quantity of a signal, which uses different frequency bands according to time;

determining the type of the frequency band used by the signal in association with time;

generating a physical quantity display graphic used to display the physical quantity on a display device in association with a time axis; and

generating a band display graphic used to display the type of the frequency band on the display device in association with the time axis,

wherein the band display graphic is a graphic having a predetermined height in a direction perpendicular to the time axis.