High speed multilevel symbol telemetry system for cardiac pacema

Details High speed multilevel symbol telemetry system for cardiac pacema High speed multilevel symbol telemetry system for cardiac pacema

1995-10-24

1998-06-30

Chin, Wellington

Pulse or digital communications

Systems using alternating or pulsating current

Angle modulation

34087026, 607 32, H04L 2710

Patent

active

057745013

ABSTRACT:
A high speed telemetry system for implantable devices such as a pacemaker includes a transmitter disposed in an implantable housing and an external receiver. Typically the housing is metallic and it attenuates drastically electromagnetic signals having frequencies above a relatively low cut-off frequency. The transmitter includes circuitry for generating cosine waves of different frequencies and for selectively assembling these waves to define a set of data symbols. Preferably one of the frequency is a multiple of the other. Integer halve-periods of the waves are selected to define the symbols such that the overall data transmission rate exceeds the cutoff frequency. The external receiver synchronizes itself to the transmitter, and decodes the symbols using a constellation chart to decode the symbols into binary data.

REFERENCES:
patent: 4223679 (1980-09-01), Schulman et al.
patent: 4281664 (1981-08-01), Duggan
patent: 4453162 (1984-06-01), Money et al.
patent: 4847617 (1989-07-01), Silvian
patent: 4944299 (1990-07-01), Silvian
patent: 4979506 (1990-12-01), Silvian
patent: 5342408 (1994-08-01), deCoriolis et al.

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