Method and apparatus for adaptive real-time signal conditioning, processing, analysis, quantification, comparision, and control

• US 7,107,306 B2
• Filed: 10/04/2003
• Issued: 09/12/2006
• Est. Priority Date: 10/07/2002
• Status: Active Grant

• Current Assignee: Alexei V. Nikitin
• Original Assignee: Alexei V. Nikitin
• Inventors: Nikitin, Alexei V.
• Primary Examiner(s): Mai, Tan V.
• Application Number:
  US10/679,164
• Publication Number:
  US 20040243659A1
• Time in Patent Office: 1,074 Days
• Field of Search: 708/819
• US Class Current: 708/819
• CPC Class Codes: G06F 2218/02 Preprocessing
• CPC Class Codes: G06G 7/02 Details not covered by G06G7/04 - G06G7/10, e.g. monitoring, construction, maintenance

Abstract

Various components of the present invention are collectively designated as Adaptive Real-Time Embodiments for Multivariate Investigation of Signals (ARTEMIS). It is a method, processes, and apparatus for measurement and analysis of variables of different type and origin. In this invention, different features of a variable can be quantified either locally as individual events, or on an arbitrary spatio-temporal scale as scalar fields in properly chosen threshold space. The method proposed herein overcomes limitations of the prior art by directly processing the data in real-time in the analog domain, identifying the events of interest so that continuous digitization and digital processing is not required, performing direct, noise-resistant measurements of salient signal characteristics, and outputting a signal proportional to these characteristics that can be digitized without the need for high-speed front-end sampling.

The application areas of ARTEMIS are numerous, e.g., it can be used for adaptive content-sentient real-time signal conditioning, processing, analysis, quantification, comparison, and control, and for detection, quantification, and prediction of changes in signals, and can be deployed in automatic and autonomous measurement, information, and control systems. ARTEMIS can be implemented through various physical means in continuous action machines as well as through digital means or computer calculations. Particular embodiments of the invention include various analog as well as digital devices, computer programs, and simulation tools.

Claims

1. A method for signal processing operable to transform an input signal into an output signal comprising a Threshold Domain Filtering step performing Threshold Domain Filtering and at least one additional step operable to perform a function selected from the group consisting of Multimodal Pulse Shaping, Analog Rank Filtering, and Analog Counting.

2. A method for signal processing as recited in claim 1 wherein said Threshold Domain Filtering step is operable to extract one or more features of interest from said input signal to produce one or more output signals.

3. A method for signal processing as recited in claim 1 wherein a threshold domain of said Threshold Domain Filtering is defined by a Control Level Signal, said Control Level Signal consisting of one or more components.

4. A method for signal processing as recited in claim 3 wherein at least one of said additional steps is operable to perform Analog Rank Filtering and wherein said one or more components of said Control Level Signal are linear combinations of outputs of said Analog Rank Filtering.

5. A method for signal processing as recited in claim 4 wherein said input signal has one or more components and wherein said Analog Rank Filtering is performed on one or more components of said input signal.

6. A method for signal processing as recited in claim 3 wherein at least one of said additional steps is operable to perform Analog Rank Filtering and wherein at least one of said additional steps is operable to perform Multimodal Pulse Shaping and wherein said one or more components of said Control Level Signal are produced by applying said Analog Rank Filtering to one or more output components of said Multimodal Pulse Shaping.

7. A method for signal processing as recited in claim 1 wherein said Threshold Domain Filtering step outputs a first output value when said input signal is within a threshold domain of said Threshold Domain Filtering and a second output value when said input signal is outside of said threshold domain.

8. A method for signal processing as recited in claim 1 wherein said Threshold Domain Filtering step outputs a first output value when said input signal is within a threshold domain of said Threshold Domain Filtering, a second output value when said input signal is outside of said threshold domain, and one or more values when said input signal is inside a finite interval at a boundary of said threshold domain.

9. A method for signal processing as recited in claim 1 wherein at least one of said additional steps is operable to perform Multimodal Pulse Shaping and wherein said input signal has one or more components and wherein said Multimodal Pulse Shaping transforms at least one of said input signal components into a plurality of output signal components where at least one of said output signal components represents a derivative of another of said output signal components.

10. A method for signal processing as recited in claim 9 wherein said derivative is a time-derivative.

11. A method for signal processing as recited in claim 9 wherein said plurality of output signal components is representative of one or more features of interest of said input signal.

12. A method for signal processing as recited in claim 1 wherein at least one of said additional steps is Analog Counting operable to perform an Analog Counting function and wherein said Threshold Domain Filtering step has an output with at least one component and where said Analog Counting comprises the steps of:

a. time-differentiating said component to produce a time-derivative, and

b. rectifying said time-derivative to produce an instantaneous count rate.

13. A method for signal processing as recited claim 12 wherein said Analog Counting further comprises the step of time-integrating said instantaneous count rate in a moving time window to produce a count rate.

14. An apparatus for signal processing operable to transform an input signal into an output signal comprising a Threshold Domain Filtering module operable to perform Threshold Domain Filtering and at least one additional module operable to perform a function selected from the group consisting of Multimodal Pulse Shaping, Analog Rank Filtering, and Analog Counting.

15. An apparatus for signal processing as recited in claim 14 wherein said Threshold Domain Filtering module is operable to extract one or more features of interest from said input signal to produce one or more output signals.

16. An apparatus for signal processing as recited in claim 14 wherein a threshold domain of said Threshold Domain Filtering is defined by a Control Level Signal, said Control Level Signal consisting of one or more components.

17. An apparatus for signal processing as recited in claim 16 wherein at least one of said additional modules is operable to perform Analog Rank Filtering and wherein said one or more components of said Control Level Signal are linear combinations of outputs of said Analog Rank Filtering.

18. An apparatus for signal processing as recited in claim 17 wherein said input signal has one or more components and wherein said Analog Rank Filtering is performed on one or more components of said input signal.

19. An apparatus for signal processing as recited in claim 16 wherein at least one of said additional modules is operable to perform Analog Rank Filtering and wherein at least one of said additional modules is operable to perform Multimodal Pulse Shaping and wherein said one or more components of said Control Level Signal are produced by applying said Analog Rank Filtering to one or more output components of said Multimodal Pulse Shaping.

20. An apparatus for signal processing as recited in claim 14 wherein said Threshold Domain Filtering module outputs a first output value when said input signal is within a threshold domain of said Threshold Domain Filtering and a second output value when said input signal is outside of said threshold domain.

21. An apparatus for signal processing as recited in claim 14 wherein said Threshold Domain Filtering module outputs a first output value when said input signal is within a threshold domain of said Threshold Domain Filtering, a second output value when said input signal is outside of said threshold domain, and one or more values when said input signal is inside a finite interval at a boundary of said threshold domain.

22. An apparatus for signal processing as recited in claim 14 wherein at least one of said additional modules is a Multimodal Pulse Shaping and wherein said input signal has one or more components and wherein said Multimodal Pulse Shaping transforms at least one of said input signal components into a plurality of output signal components where at least one of said output signal components represents a derivative of another of said output signal components.

23. An apparatus for signal processing as recited in claim 22 wherein said derivative is a time-derivative.

24. An apparatus for signal processing as recited in claim 22 wherein said plurality of output signal components is representative of one or more features of interest of said input signal.

25. An apparatus for signal processing as recited in claim 14 wherein at least one of said additional modules is an Analog Counting module operable to perform an Analog Counting function and wherein said Threshold Domain Filtering module has an output with at least one component and where said Analog Counting module comprises:

a. a differentiator operable to time-differentiate said component to produce a time-derivative, and

b. a rectifier operable to rectify said time-derivative to produce an instantaneous count rate.

26. An apparatus for signal processing as recited claim 25 wherein said Analog Counting module further comprises an integrator operable to time-integrate said instantaneous count rate in a moving time window to produce a count rate.