SYSTEM AND METHOD FOR REMOVING NARROWBAND NOISE
First Claim
Patent Images
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 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.
0 Assignments
0 Petitions
Accused Products
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.
56 Citations
20 Claims
-
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 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. 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. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
-
Specification