System and method for removing narrowband noise
First Claim
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1. 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 spectrum of the received signal;
circuitry for detecting a noise spectrum of the received signal by subtracting a template spectrum from the spectrum of the received signal, the template spectrum representing a noise-free signal;
circuitry for scaling the template spectrum such that the signal power of the noise spectrum is minimized;
circuitry for identifying frequency peaks in the noise spectrum in accordance with spectral thresholds derived from the signal power of the noise spectrum;
one or more notch filters for removing noise from the received signal, the notch filters having notch frequencies corresponding to frequency peaks 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.
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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.
43 Citations
20 Claims
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1. A system for receiving data from an implantable medical device, comprising:
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an antenna for receiving a signal transmitted from the implantable device; circuitry for computing a spectrum of the received signal; circuitry for detecting a noise spectrum of the received signal by subtracting a template spectrum from the spectrum of the received signal, the template spectrum representing a noise-free signal; circuitry for scaling the template spectrum such that the signal power of the noise spectrum is minimized; circuitry for identifying frequency peaks in the noise spectrum in accordance with spectral thresholds derived from the signal power of the noise spectrum; one or more notch filters for removing noise from the received signal, the notch filters having notch frequencies corresponding to frequency peaks 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for receiving data from an implantable medical device, comprising:
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receiving a signal transmitted from the implantable device; computing a spectrum of the received signal; detecting a noise spectrum of the received signal by subtracting a template spectrum from the spectrum of the received signal, the template spectrum representing a noise-free signal; scaling the template spectrum such that the signal power of the noise spectrum is minimized; identifying frequency peaks in the noise spectrum in accordance with spectral thresholds derived from the signal power of the noise spectrum; removing noise from the received signal with one or more notch filters, the notch filters having notch frequencies corresponding to frequency peaks of the detected noise spectrum; updating filter coefficients of the notch filters so that the notch frequencies correspond to the detected noise spectrum. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification