Patent ID: 6453200
Filing Date: 2002-09-17
Classification: A61N,H04B

Abstract:
A method for wireless communication with a medical device implanted in the human body, wherein in a transmitter an information input signal undergoes an angle modulation and reaches a receiver through a transmission channel, and further wherein angle modulated pulses carrying information possessing a frequency spectrum are generated in the transmitter and may be time compressed in the receiver using a frequency dependent delay time dispersion filter, and further wherein the pulses are created of shorter duration and increased amplitude compared to emitted pulses, wherein the pulses on a transmitter side undergo modulation or an encoding process and are imprinted with at least a part of information that constitutes a message, and wherein at least a part of the information that constitutes the message is also imprinted onto the angle modulation, wherein a quasi-Dirac pulse sequence is approximated in the transmitter and fed to a low-pass filter, the low pass filter characteristic of which possess a peak shortly before the critical frequency, and thus transforms the pulse sequence into a series of Sinc-pulses, having a shape of a Sinc function, which subsequently is carried to an amplitude modulator, which imprints a Sinc-shaped envelope onto each pulse of a carrier oscillation, and a signal generated after transformation is fed to a dispersive filter, at an output of which arrives a frequency modulated pulse sequence.