Data processing apparatus, intrusion sensor and antitheft apparatus

• US 7,319,390 B2
• Filed: 12/13/2005
• Issued: 01/15/2008
• Est. Priority Date: 12/16/2004
• Status: Expired due to Fees

• Current Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Original Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Inventors: Sasaki, Yoshihiro, Takasuka, Hirofumi, Seike, Yasushi
• Primary Examiner(s): TRIEU, VAN THANH
• Application Number:
  US11/299,624
• Publication Number:
  US 20060244591A1
• Time in Patent Office: 763 Days
• Field of Search: 340/426.1, 340/541, 340/545.1, 340/545.3, 340/522, 340/680, 340/683, 379/88.19, 379/88.21, 379/142.01, 369/44.13, 369/47.1, 345/440.1, 345/690
• US Class Current: 340/541
• CPC Class Codes: B60R 25/1004 Alarm systems characterised by the type of sensor, e.g. current sensing means using door lock sensors B60R25/1001
• CPC Class Codes: G08B 13/2491 Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Abstract

A data processing apparatus executes data processing with respect to an output of A/D conversion of an input signal. The data processing apparatus includes a high-frequency noise recognition unit. The high-frequency noise recognition unit detects number of peaks of waveforms of the input signal on a basis of the output of the A/D conversion. The high-frequency noise recognition unit determines whether or not the number of the peaks, which has been detected within a predetermined time, is equal to or larger than a predetermined value.

Claims

1. A data processing apparatus for executing data processing with respect to an output of A/D conversion of an input signal, the data processing apparatus comprising:

a high-frequency noise recognition unit that detects number of peaks of waveforms of the input signal on a basis of the output of the A/D conversion, the high-frequency noise recognition unit that determines whether or not the number of the peaks, which has been detected within a predetermined time, is equal to or larger than a predetermined value.

2. The data processing apparatus according to claim 1, wherein when the high-frequency noise recognition unit determines that the number of the peaks, which has been detected within the predetermined time, is equal to or larger than the predetermined value, the data processing is disabled.

3. The data processing apparatus according to claim 2, further comprising:

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal, wherein;

when the high-frequency noise recognition unit determines that the number of the peaks, which has been detected within the predetermined time, is equal to or larger than the predetermined value, the high-frequency noise recognition unit disables the data processing executed by the determining section.

4. The data processing apparatus according to claim 2, wherein the high-frequency noise recognition unit performs moving interval integral to detect the number of the peaks within the predetermined time.

5. The data processing apparatus according to claim 2, wherein the high-frequency noise recognition unit detects the number of the peaks using the peaks or bottoms of waveforms, which are undergone offset processing.

6. The data processing apparatus according to claim 1, further comprising:

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal; and

a prohibiting section that prohibits an output of the determining section from being output to an outside of the data processing apparatus, when the high-frequency noise recognition unit determines that the number of the peaks, which has been detected within the predetermined time, is equal to or larger than the predetermined value.

7. The data processing apparatus according to claim 1, wherein the high-frequency noise recognition unit detects the number of the peaks of the waveforms of the input signal on a basis of the output of the A/D conversion, using an nth waveform of the input signal and subsequent waveforms of the input signal where n is a natural number.

8. The data processing apparatus according to claim 1, wherein when an amplitude of each waveform is equal to or larger than another predetermined value, the high-frequency noise recognition unit determines whether or not the number of the peaks, which has been detected within the predetermined time, is equal to or larger than the predetermined value.

9. The data processing apparatus according to claim 1, wherein:

the high-frequency noise recognition unit detects the number of the peaks of the waveforms of the input signal for another predetermined time beginning at occurrence of the waveforms, and

after the high-frequency noise recognition unit has determined that the number of the peaks, which has been detected within the predetermined time, is less than the predetermined value, the data processing is enabled.

10. The data processing apparatus according to claim 1, wherein when the data processing has been disabled and an amplitude of the input signal continues to be equal to or lower than another predetermined value for another predetermined time, the data processing is enabled.

11. The data processing apparatus according to claim 1, wherein the high-frequency noise recognition unit is prohibited from detecting the number of the peaks of the waveforms for another predetermined time beginning at occurrence of the waveforms.

12. The data processing apparatus according to claim 1, wherein:

a plurality of different conditions for prohibition of the output of the determination result are stored, and the data processing is disabled on a basis of logical sum of the respective conditions.

13. A data processing apparatus for executing data processing with respect to an output of A/D conversion of an input signal, the data processing apparatus comprising:

a constant-period noise recognition unit that detects a period of each waveform of the input signal and a rising time of each waveform from a rising edge of each waveform to a peak of each waveform, on a basis of the output of the A/D conversion, the constant-period noise recognition unit that determines whether or not waveforms having the substantially same period are input continuously and whether or not the rising times of the waveforms are shorter than a predetermined rising time, wherein;

when the constant-period noise recognition unit determines that the waveforms having the substantially same period are input continuously and that the rising times of the waveforms are shorter than the predetermined rising time, the data processing is disabled.

14. The data processing apparatus according to claim 13, further comprising:

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal, wherein;

when the constant-period noise recognition unit determines that the waveforms having the substantially same period are input continuously and that the rising times of the waveforms are shorter than the predetermined rising time, the constant period noise recognition unit disables the data processing executed by the determining section.

15. The data processing apparatus according to claim 13, further comprising:

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal; and

a prohibiting section that prohibits an output of the determining section from being output to an outside of the data processing apparatus, when the constant-period noise recognition unit determines that the waveforms having the substantially same period are input continuously and that the rising times of the waveforms are shorter than the predetermined rising time.

16. The data processing apparatus according to claim 13, wherein the constant-period noise recognition unit integrates rising times of a particular number of waveforms to detect the rising times of the waveforms.

17. The data processing apparatus according to claim 13, wherein the constant-period noise recognition unit integrates the rising times of the waveforms for a predetermined time to determine whether or not the rising times of the waveforms are shorter than the predetermined rising time.

18. The data processing apparatus according to claim 13, wherein the constant-period noise recognition unit detects only a waveform having a period in a predetermined range.

19. The data processing apparatus according to claim 13, wherein when the constant-period noise recognition unit determines that the periods of the waveforms and the rising times of the waveforms are in respective predetermined ranges for a predetermined time, the data processing is disabled.

20. The data processing apparatus according to claim 13, wherein:

the determining unit selects a period of an nth waveform as a reference value where n is a natural number, and the determining unit determines whether or not each waveform of the input signal is in a predetermined range from the reference value.

21. The data processing apparatus according to claim 13, wherein when an amplitude of each waveform is equal to or larger than another predetermined value, the constant-period noise recognition unit detects whether or not the waveforms having the substantially same period are input continuously and whether or not the rising times of the waveforms are shorter than the predetermined rising time.

22. The data processing apparatus according to claim 13, wherein:

the constant-period noise recognition unit detects the period of each waveform of the input signal and the rising time of each wave form for a predetermined time beginning at occurrence of the waveforms, and

after the constant-period noise recognition unit has determined that the waveforms having the substantially same period are not input continuously or that the rising times of the waveforms are equal to or longer than the predetermined rising time, the data processing is enabled.

23. The data processing apparatus according to claim 13, wherein when the data processing has been disabled and an amplitude of the input signal continues to be equal to or lower than a predetermined value for another predetermined time, the data processing is enabled.

24. The data processing apparatus according to claim 13, wherein the constant-period noise recognition unit is prohibited from detecting the period of each waveform of the input signal and the rising time of each waveform, for a predetermined time beginning at occurrence of the waveforms.

25. A data processing apparatus for executing data processing with respect to an output of A/D conversion of an input signal, the data processing apparatus comprising:

a noise recognition unit that comprises a high-pass filter to which the input signal is input, wherein;

when an output of the high-pass filter is equal to larger than a predetermined threshold value, the data processing is disabled.

26. The data processing apparatus according to claim 25, further comprising:

a comparing unit that compares the output of the high-pass filter with the predetermined threshold value; and

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal, wherein;

when the comparing unit determines that the output of the high pass filter is equal to larger than the predetermined threshold value, the comparing unit disables the data processing executed by the determining section.

27. The data processing apparatus according to claim 26, wherein:

the comparing unit compares the output of the high-pass filter with the predetermined threshold value for a predetermined time beginning at occurrence of the waveforms, and after the comparing unit has determined that the output of the high-pass filter is less than the predetermined threshold value, the data processing is enabled.

28. The data processing apparatus according to claim 26, wherein the comparing unit is prohibited from comparing the output of the high-pass filter with the predetermined threshold value for a predetermined time beginning at occurrence of the waveforms.

29. The data processing apparatus according to claim 25, further comprising:

a comparing unit that compares the output of the high-pass filter with the predetermined threshold value;

a determining section that executes the data processing with respect the output of the A/D conversion of the input signal; and

a prohibiting section that prohibits an output of the determining section from being output to an outside of the data processing apparatus, when the comparing unit determines that the output of the high-pass filter is equal to larger than the predetermined threshold value.

30. The data processing apparatus according to claim 25, wherein when the data processing has been disabled and an amplitude of the input signal continues to be equal to or lower than another predetermined value for another predetermined time, the data processing is enabled.