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US 2006/0142821 A1Published application
System and method for removing narrowband noise
AssigneeCardiac Pacemakers, Inc.
InventorsJoseph Bange, Steven Schmitt, Fred Schleifer
Life of this patent
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Abstract
A system and method for removing narrowband noise from an input signal in which notch filters having notch frequencies corresponding to the noise are dynamically adjusted in accordance with a detected noise spectrum. The method may be applied to telemetry systems for implantable medical devices such as cardiac pacemakers to result in improved noise immunity.
Claims20
A system for receiving data from an implantable medical device, comprising:
- an antenna for receiving a signal transmitted from the implantable device;
- circuitry for computing a frequency spectrum of the received signal;
- circuitry for detecting a noise spectrum of the received signal by subtracting a template spectrum from the frequency spectrum of the received signal, the template spectrum representing a noise-free signal;
- one or more notch filters for removing noise from the received signal, the notch filters having notch frequencies corresponding to frequency components of the detected noise spectrum;
- a filter generator for updating filter coefficients of the notch filters so that the notch frequencies correspond to the detected noise spectrum.
2 more elements
A method for receiving data from an implantable medical device, comprising:
- receiving a signal transmitted from the implantable device;
- computing a frequency spectrum of the received signal;
- detecting a noise spectrum of the received signal by subtracting a template spectrum from the frequency spectrum of the received signal, the template spectrum representing a noise-free signal;
- removing noise from the received signal with one or more notch filters, the notch filters having notch frequencies corresponding to frequency components of the detected noise spectrum;
- updating filter coefficients of the notch filters so that the notch frequencies correspond to the detected noise spectrum.
2 more elements
Dependencies are inferred from the claim text.