METHOD AND SYSTEM FOR REAL-TIME DIGITAL FILTERING FOR ELECTROPHYSIOLOGICAL AND HEMODYNAMIC AMPLIFERS
First Claim
1. A method of real-time digital filtering for electrophysiological and hemodynamic amplifiers, the method comprising:
- inputting a set of digital data from a patient;
removing a stimulus artifact from the set of digital data when a pacing function is on;
filtering the set of digital data with a first order high-pass filter and a second order low-pass filter or a special resonator; and
performing a sample rate conversion and a data scaling on the set of digital data when a notch function is off.
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Abstract
The present invention includes a method and system for real-time digital filtering for electrophysiological and hemodynamic amplifiers. The invention replaces the analog circuits currently used for signal filtering and conditioning in such systems with digital filters that may be implemented in a software application. The method and system includes digitizing the analog signal collected from the patient prior to performing the signal filtering and conditioning. The method and system also includes removing stimulus artifacts, as well as performing sample rate conversion and scaling on the digital signal. The processed digital signals may be used, displayed, saved and converted to analog signal thru digital-to-analog conversion.
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Citations
15 Claims
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1. A method of real-time digital filtering for electrophysiological and hemodynamic amplifiers, the method comprising:
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inputting a set of digital data from a patient; removing a stimulus artifact from the set of digital data when a pacing function is on; filtering the set of digital data with a first order high-pass filter and a second order low-pass filter or a special resonator; and performing a sample rate conversion and a data scaling on the set of digital data when a notch function is off. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for real-time digital filtering for electrophysiological and hemodynamic amplifiers, the system comprising:
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an acquisition device configured to collect a set of analog cardiac data from a patient, wherein the acquisition device is further configured to convert the set of analog cardiac data to a set of digital data; a storage media for storing a computer application; and a processing unit coupled to the acquisition device and the storage media, the processing unit configured to execute the computer application, and further configured to receive the set of digital data from the acquisition device, wherein when the computer application is executed, a stimulus artifact is removed from the set of digital data when a pacing function is on, and the set of digital data is filtered with a first order high-pass filter and a second order low-pass filter or a special resonator, and a sample rate conversion and a data scaling is performed on the set of digital data when a notch function is off. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of real-time digital filtering, the method comprising:
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collecting a set of analog cardiac data from a patient; converting the analog cardiac data to a set of digital data; removing a stimulus artifact from the set of digital data when a pacing function is on; filtering the set of digital data with a first order Butterworth high-pass filter and a second order Butterworth low-pass filter or a special resonator; performing a sample rate conversion and a data scaling on the set of digital data when a notch function is off; filtering the set of digital data with three first-order Butterworth notch filters at base, 2nd and 3rd harmonics of the power line frequency when the notch function is on, and the notch function is fixed; filtering the set of digital data with three amplitude adaptive notch filters at base, 2nd and 3rd harmonics of the power line frequency when the notch function is on, and the notch function is not fixed; and outputting an analog signal derived from the set of digital data.
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Specification