System and method for an acquisition of data in a particular manner

• US 6,621,443 B1
• Filed: 10/01/2002
• Issued: 09/16/2003
• Est. Priority Date: 10/01/2002
• Status: Expired due to Fees

• Current Assignee: Basilio Selli, Mário Missawa
• Original Assignee: Basilio Selli, Mário Missawa
• Inventors: Selli, Basilio, Missawa, Mário
• Primary Examiner(s): JeanGlaude, Jean Bruner
• Application Number:
  US10/262,000
• Time in Patent Office: 350 Days
• Field of Search: 341/155, 341/161, 341/159, 341/158, 341/160, 341/110, 329/363, 375/222, 324/763
• US Class Current: 341/155
• CPC Class Codes: G06F 3/05 Digital input using the sampling of an analogue quantity at regular intervals of time , input from a/d converter or output to d/a converter
• CPC Class Codes: H03M 1/127 at intervals varying with the rate of change of the input signal

Abstract

A data acquisition method and system for obtaining digital samples are provided. A first digital sample related to an analog signal is obtained after a first time period. A second digital sample related to the analog signal is obtained after a second time period. The second digital sample is provided on at least one output if magnitudes of the first digital sample and the second digital sample differ from one another by a predetermined threshold.

Claims

1. A method, comprising the steps of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period; and

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold, wherein the difference between the magnitudes of the first and second digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the second digital sample.

2. The data acquisition method of claim 1, further comprising the steps of:

obtaining a third digital sample related to the analog signal after a third time period; and

providing the third digital sample on the at least one output if the magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

3. The method of claim 1, wherein the second time period follows the first time period.

4. The method of claim 1, wherein the first digital sample and the second digital sample are provided at a particular precision.

5. The method of claim 1, wherein the first time period is equal to the second time period.

6. The method of claim 1, wherein the first digital sample is a thirteen-bit digital sample.

7. The method of claim 1, wherein the second digital sample is a thirteen-bit digital sample.

8. The method of claim 1, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

9. The method of claim 2, wherein the third digital sample is a seventeen-bit digital sample.

10. The method of claim 2, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

11. The method of claim 2, wherein the third time period follows the second time period.

12. The method of claim 2, wherein the third digital sample is provided at a further precision.

13. The method of claim 2, wherein the first time period is shorter than the third time period.

14. The method of claim 2, wherein the third digital sample has a precision which is higher than the precision of the first digital sample.

15. The method of claim 2, wherein the third digital sample has a precision which is higher than a precision of the second digital sample.

16. A data acquisition system, comprising:

a data processing unit including an at least one data input and at least one data output, wherein when executing a computer program, the data processing unit is adapted to;

obtain a first digital sample related to an analog signal after a first time period;

obtain a second digital sample related to the analog signal after a second time period;

compare the second digital sample to the first digital sample; and

provide the second digital sample on the at least one data output if a magnitude of the first digital sample differs from a magnitude of the second digital sample differ by more than a predetermined threshold, wherein the difference between the magnitudes of the first and second digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the second digital sample.

17. The data acquisition system of claim 16, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

18. The data acquisition system of claim 16, wherein the data processing unit is further configured obtain a third digital sample related to the analog signal after a third time period, wherein the data processing unit compares the magnitude of the third digital sample to the magnitude of the first digital sample, wherein the data processing unit produces the third digital sample at the at least one data output if respective magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

19. The data acquisition system of claim 16, further comprising:

an analog to digital (A/D) converter including an A/D input and at least one A/D output, wherein the A/D input is configured to receive an analog signal, wherein the at least one A/D output is configured to provide a digital representation of the analog signal, and wherein the at least one A/D output is operatively connected to the at least one data input of the data processing unit.

20. The data acquisition system of claim 16, wherein the second time period follows the first time period.

21. The data acquisition system of claim 16, wherein the first digital sample and the second digital sample are provided at a particular precision.

22. The data acquisition system of claim 16, wherein the first time period is equal to the second time period.

23. The data acquisition system of claim 16, wherein the first digital sample is a thirteen-bit digital sample.

24. The data acquisition system of claim 16, wherein the second digital sample is a thirteen-bit digital sample.

25. The data acquisition system of claim 18, wherein the third digital sample has a precision which is higher than a precision of the second digital sample.

26. The data acquisition system of claim 18, wherein the third digital sample is a seventeen-bit digital sample.

27. The data acquisition system of claim 18, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

28. The data acquisition system of claim 18, wherein the third time period follows the second time period.

29. The data acquisition system of claim 18, wherein the third digital sample is provided at a further precision.

30. The data acquisition system of claim 18, wherein the first time period is shorter than the third time period.

31. The data acquisition system of claim 18, wherein the third digital sample has a precision which is higher than a precision of the first digital sample.

32. A data acquisition system, comprising:

a data processing unit including an at least one data input and at least one data output, wherein when executing a computer program, the data processing unit is adapted to;

obtain a first digital sample related to an analog signal after a first time period;

obtain a second digital sample related to the analog signal after a second time period;

provide the second digital sample on the at least one data output if a magnitude of the first digital sample differs from a magnitude of the second digital sample differ by more than a predetermined threshold;

obtain a third digital sample related to the analog signal after a third time period; and

provide the third digital sample at the at least one data output if respective magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

33. The data acquisition system of claim 32, wherein the third digital sample has a precision which is higher than a precision of the first digital sample.

34. The data acquisition system of claim 32, wherein the first time period is shorter than the third time period.

35. The data acquisition system of claim 32, wherein the first digital sample and the second digital sample are provided at a particular precision.

36. The data acquisition system of claim 32, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

37. The data acquisition system of claim 32, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

38. The data acquisition system of claim 32, wherein the third digital sample is provided at a further precision.

39. A method, comprising the steps of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period;

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold;

obtaining a third digital sample related to the analog signal after a third time period; and

providing the third digital sample on the at least one output if the magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

40. The method of claim 39, wherein the third digital sample has a precision which is higher than a precision of the first digital sample.

41. The method of claim 39, wherein the third digital sample is provided at a further precision.

42. The method of claim 39, wherein the first digital sample and the second digital sample are provided at a particular precision.

43. The method of claim 39, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

44. The method of claim 39, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

45. A storage medium storing a software program, wherein the software program, when executed by a processing arrangement, is configured to cause the processing arrangement to execute the steps comprising of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period;

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold;

obtaining a third digital sample related to the analog signal after a third time period; and

providing the third digital sample on the at least one output if the magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

46. The storage medium of claim 45, wherein the first digital sample and the second digital sample are provided at a particular precision.

47. The storage medium of claim 45, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

48. The storage medium of claim 45, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

49. The storage medium of claim 45, wherein the third digital sample is provided at a further precision.

50. A logic arrangement adapted for execution by a processing arrangement to perform the steps comprising of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period;

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold;

obtaining a third digital sample related to the analog signal after a third time period; and

providing the third digital sample on the at least one output if the magnitudes of the first digital sample, the second digital sample and the third digital sample differ from one another by less than the predetermined threshold.

51. The logic arrangement of claim 50, wherein the first digital sample and the second digital sample are provided at a particular precision.

52. The logic arrangement of claim 50, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

53. The logic arrangement of claim 50, wherein the difference between the magnitudes of the first and third digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the third digital sample.

54. The logic arrangement of claim 50, wherein the third digital sample is provided at a further precision.

55. A storage medium storing a software program, wherein the software program, when executed by a processing arrangement, is configured to cause the processing arrangement to execute the steps comprising of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period; and

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold, wherein the difference between the magnitudes of the first and second digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the second digital sample.

56. The storage medium of claim 55, wherein the first digital sample and the second digital sample are provided at a particular precision.

57. The storage medium of claim 55, wherein the first time period is equal to the second time period.

58. The storage medium of claim 55, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.

59. A logic arrangement adapted for execution by a processing arrangement to perform the steps comprising of:

obtaining a first digital sample related to an analog signal after a first time period;

obtaining a second digital sample related to the analog signal after a second time period; and

providing the second digital sample on at least one output if a magnitude of the first digital sample differs from a magnitude of the second digital sample by more than a predetermined threshold, wherein the difference between the magnitudes of the first and second digital samples exceeds the predetermined threshold if at least one bit of the first digital sample differs from a respective matching bit of the second digital sample.

60. The logic arrangement of claim 59, wherein the first digital sample and the second digital sample are provided at a particular precision.

61. The logic arrangement of claim 59, wherein the first time period is equal to the second time period.

62. The logic arrangement of claim 59, wherein the predetermined threshold is a percentage of the magnitude of the first digital sample.