Claims
- 1. A method for reducing noise associated with an input signal provided to a control system while substantially minimizing the adverse affect on the responsiveness and stability of the control system, the method comprising the steps of:
determining an input signal level of an input signal at an input of a noise reduction system; determining an output signal level of an output signal at an output of the noise reduction system; determining a magnitude of a difference signal, wherein the difference signal is the difference between the input signal level and the output signal level; providing the input signal to an input of a control system when the magnitude of the difference signal is less than a predetermined noise limit; and providing the output signal to the input of the control system when the magnitude of the difference signal is greater than or equal to the predetermined noise limit.
- 2. The method of claim 1, wherein the predetermined noise limit is one of a predetermined percentage of the output signal and a predetermined percentage of the input signal.
- 3. The method of claim 1, wherein the noise reduction system includes a noise filter that is implemented in hardware.
- 4. The method of claim 3, wherein the noise filter is a passive low pass filter.
- 5. The method of claim 3, wherein the noise filter is an active low pass filter.
- 6. The method of claim 1, wherein the noise reduction system includes a noise filter that is implemented in software.
- 7. The method of claim 6, wherein the noise filter is a low pass filter.
- 8. The method of claim 1, wherein the determined output signal level of the output signal is an average output signal level based on a predetermined number of samples.
- 9. The method of claim 8, wherein the predetermined number of samples utilized in determining the average output signal level is based on the magnitude of the difference signal.
- 10. A noise reduction system for reducing noise associated with an input signal provided to a control system while substantially minimizing the adverse affect on the responsiveness and stability of the control system, the system comprising:
a processor; a memory subsystem coupled to the processor; and processor executable code for causing the processor to perform the steps of:
determining an input signal level of an input signal at an input of the noise reduction system; determining an output signal level of an output signal at an output of the noise reduction system; determining a magnitude of a difference signal, wherein the difference signal is the difference between the input signal level and the output signal level; providing the input signal to an input of a control system when the magnitude of the difference signal is less than a predetermined noise limit; and providing the output signal to the input of the control system when the magnitude of the difference signal is greater than or equal to the predetermined noise limit.
- 11. The system of claim 10, wherein the predetermined noise limit is one of a predetermined percentage of the output signal and a predetermined percentage of the input signal.
- 12. The system of claim 10, wherein the noise reduction system includes a noise filter that is implemented in hardware.
- 13. The system of claim 12, wherein the noise filter is a passive low pass filter.
- 14. The system of claim 12, wherein the noise filter is an active low pass filter.
- 15. The system of claim 10, wherein the noise reduction system includes a noise filter that is implemented in software.
- 16. The system of claim 15, wherein the noise filter is a low pass filter.
- 17. The system of claim 10, wherein the determined output signal level of the output signal is an average output signal level based on a predetermined number of samples.
- 18. The system of claim 17, wherein the predetermined number of samples utilized in determining the average output signal level is based on the magnitude of the difference signal.
- 19. An automotive noise reduction system for reducing noise associated with an input signal provided to a control system while substantially minimizing the adverse affect on the responsiveness and stability of the control system, the system comprising:
a processor; an automotive sensor coupled to the processor, the sensor providing an input signal; a memory subsystem coupled to the processor; and processor executable code for causing the processor to perform the steps of:
determining an input signal level of the input signal at an input of the noise reduction system; determining an output signal level of an output signal at an output of the noise reduction system; determining a magnitude of a difference signal, wherein the difference signal is the difference between the input signal level and the output signal level; providing the input signal to an input of an automotive control system when the magnitude of the difference signal is less than a predetermined noise limit; and providing the output signal to the input of the control system when the magnitude of the difference signal is greater than or equal to the predetermined noise limit.
- 20. The system of claim 19, wherein the predetermined noise limit is one of a predetermined percentage of the output signal and a predetermined percentage of the input signal.
- 21. The system of claim 19, wherein the noise reduction system includes a noise filter that is implemented in hardware.
- 22. The system of claim 21, wherein the noise filter is a passive low pass filter.
- 23. The system of claim 21, wherein the noise filter is an active low pass filter.
- 24. The system of claim 19, wherein the noise reduction system includes a noise filter that is implemented in software.
- 25. The system of claim 24, wherein the noise filter is a low pass filter.
- 26. The system of claim 19, wherein the determined output signal level of the output signal is an average output signal level based on a predetermined number of samples.
- 27. The system of claim 26, wherein the predetermined number of samples utilized in determining the average output signal level is based on the magnitude of the difference signal.
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority based on U.S. Provisional Patent Application Serial No. 60/187,783, entitled “DECREASED PHASE LAG FILTER,” by David J. Trapasso, filed Mar. 8, 2000, the disclosure of which is hereby incorporated by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60187783 |
Mar 2000 |
US |