Signal acquisition system utilizing ultra-wide time range time base

• US 5,444,459 A
• Filed: 06/22/1993
• Issued: 08/22/1995
• Est. Priority Date: 12/03/1990
• Status: Expired due to Term

• Current Assignee: Mentor Graphics Corporation (Siemens AG)
• Original Assignee: Zeelan Technology, Inc.
• Inventors: Moriyasu, Hiro
• Primary Examiner(s): Weldon, Ulysses
• Assistant Examiner(s): Mengistu, Amare
• Application Number:
  US08/081,781
• Time in Patent Office: 791 Days
• Field of Search: 341/61, 341/118, 341/155, 341/122, 341/123, 341/125, 328/151, 328/13, 328/28, 324/77 R, 324/102, 358/160, 345/133, 345/134, 364/855
• US Class Current: 345/440.1
• CPC Class Codes: G01R 13/24 Time-base deflection circuits

Abstract

A signal acquisition system using an ultra-wide time range digitizer with variable time interval data sampling and data storage includes signal conditioning and sampling stages, a digitizing stage for generating digital representations of a signal, and a memory for storing the digital representations. Timing circuitry controls sampling and digitizing which may be varied so as to acquire signals on linear, logarithmic, or other time bases. Signal compression may be obtained by digitizing information only when a desired change rate is observed. A display allows acquired signals to be displayed in linear, logarithmic or other manner.

Claims

1. A display method for a signal acquisition system using an ultra-wide time range digitizer comprising the steps of:

obtaining first data representative of a signal across a non-linear portion of an ultra-wide time range of said digitizer;

obtaining second data representative of said signal across a linear portion of the ultra-wide time range;

displaying said first data in a non-linearly scaled fashion in a first region of a display; and

displaying said second data in a linearly scaled fashion in a second region of the display,

wherein said first and second regions are contiguously related within the display in accordance with the associated relative relationship between said linear and non-linear portions of the ultra-wide time range.

2. The method according to claim 1 wherein said step of displaying said second data in said second region comprises providing a linear portrayal thereof between zero and a first portion of said second region to allow zero reference in the display.

3. The method according to claim 2 wherein said step of obtaining said first data comprises obtaining data representative of said signal across a logarithmic portion of the ultra-wide time range.

4. The method according to claim 1 wherein said step of obtaining said first data comprises obtaining data representative of said signal across a logarithmic portion of the ultra-wide time range.

5. The method according to claim 4 wherein said step of obtaining said second data comprises sequentially sampling said signal, the sequential sampling having a substantially equal time duration between samples;

and

wherein said step of obtaining said first data comprises sampling said signal using a sequence of sample groupings of associated sequential samplings, the sequential sampling of a first sample grouping having a time duration between samples of greater or lesser duration relative those of a second sample grouping in accordance with the relative position of the first sample grouping relative to said second sample grouping in the sequence of said sample groupings and of greater duration relative the time duration between the samples associated with obtaining said second data.

6. The method according to claim 1 wherein said step of obtaining said first data comprises sampling said signal using a sequence of sample groupings of associated sequential samplings, the sequential sampling of a first sample grouping having a time duration between samples of greater or lesser duration relative those of a second sample grouping in accordance with the relative position of the first sample grouping relative to said second sample grouping in the sequence of said sample groupings;

and

wherein said step of obtaining said second data comprises sequentially sampling said signal subsequent the samplings associated with obtaining said first data, the sequential sampling associated with obtaining said second data having a time duration between samples greater than those between the samplings associated with obtaining said first data.

7. A display method for a signal acquisition system using an ultra-wide time range digitizer comprising the steps of:

displaying a first set of data obtained by the digitizer in a first region; and

displaying a second set of data obtained by the digitizer in a second region,

wherein said first and second sets of data are portrayed in contiguous relationship to each other along a shared axis, but in accordance with different associated scalings along said shared axis, and wherein the scaling associated with said first set of data along said shared axis is linear, and the scaling associated with said second set of data along said shared axis is logarithmic.

8. The method according to claim 7 wherein said shared axis is a time axis.