Patent ID: 6556871
Filing Date: 2003-04-29
Classification: A61N,H04B,Y10S

Abstract:
A system for receiving data from an implantable medical device, comprising:an antenna for receiving an input signal which includes a transmitted signal containing transmit pulses from the implantable device; a matched filter for filtering the input signal and producing an output signal which corresponds to a cross-correlation between the input signal and a transmit pulse expected to be generated by the implantable device; a noise peak detector for measuring a peak noise value in the input signal; a transmitted signal peak detector for measuring a peak transmitted signal value in the input signal; circuitry for adjusting a pulse threshold value which computes the pulse threshold value as a value between the measured peak noise value and the measured transmitted signal peak value; and, a pulse detector for detecting transmit pulses within the input signal by comparing the output signal of the matched filter with the pulse threshold value.