Without being obstructed the heart beat signal in the radio interference, the manner which is transmitted

摘要

PCT No. PCT/FI94/00494 Sec. 371 Date Jun. 15, 1995 Sec. 102(e) Date Jun. 15, 1995 PCT Filed Nov. 3, 1994 PCT Pub. No. WO95/12350 PCT Pub. Date May 11, 1995A method of interference-tolerant heartbeat measurement, in which method the heartbeat signal of a person is measured from a suitable part of the body and transmitted as burst signals from a transmitter (1-4) to a receiver (5-10) by telemetric data transmission, the transmitting interval of the burst signals being proportional to the measured heartbeat rate of the person. The burst signal is amplitude-modulated with a frequency or a frequency sequence characteristic of each transmitter/receiver unit, or a phase-shift sequence characteristic of each transmitte/receiver unit is caused in the burst signal at desired intervals, the receiver recognizing bursts intended for it on the basis of this sequence.