US 5,611,346 A
Method of interference-tolerant transmission of heartbeat signalsGeneral
US 5,611,346 A
Method of interference-tolerant transmission of heartbeat signals
Tech Center:
3300
Examiner:
George Manuel
Art Unit:
3305
Agent:
Inventors:
ILKKA HEIKKILA; ARTO PIETILA
Assignee:
Priority:
08/16/93
Filed:
08/15/94
Granted:
03/18/97
Expiration:
04/14/15
Abstract
A method of interference-tolerant heartbeat measurement comprises the steps of measuring the person's heartbeat signal at a suitable part of the body and transmitting the signal by telemetric transmission from a transmitter to a receiver as a pulse message formed by successive measuring pulses. A transmission interval of at least some pulse signals is proportional to the person's measured heartbeat rate. Each measuring pulse is formed of at least two identification pulses (C1 and C2), whereby the time interval (t.sub.x) between the identification pulses corresponds to a specific time interval determined for each transmitter-receiver pair, on the basis of which specific interval the receiver identifies the pulse signals intended for itself.