Patent ID: 7016739
Filing Date: 2006-03-21
Classification: A61N,H04B,Y10S

Abstract:
1. A medical device programmer comprising: an antenna adapted to receive a signal transmitted from an implantable medical device, the signal including a carrier signal modulated with transmit pulses by amplitude shift keying, the transmit pulses generated by the implantable medical device; analog receiver circuitry coupled to the antenna; an analog-to-digital converter to digitize the received signal into sets of input samples; at least one filter coupled to the analog-to-digital converter, the at least one filter having frequency characteristics dynamically adjustable based on at least one peak frequency in a noise spectrum of the received signal; a noise spectrum detector, coupled to the at least one filter, to detect the at least one peak frequency in the noise spectrum by discrete Fourier transforming one or more of the sets of input samples to produce a power spectrum of the received signal and subtracting a template spectrum therefrom, the template spectrum corresponding to a representative input signal without noise; and a pulse detector, coupled to the at least one filter, to detect the transmit pulses.