Short range inductively coupled communication system employing t

Details Short range inductively coupled communication system employing t Short range inductively coupled communication system employing t

1993-07-02

1997-03-25

O'Shea, Sandra L.

Pulse or digital communications

Systems using alternating or pulsating current

381 682, 381 684, 381 79, 455 41, H04R 2500, H04R 500, H04L 27100, H04B 500

Patent

active

056152299

ABSTRACT:
A short range magnetically coupled wireless communication system employs time variant modulation of a high repetition rate pulse stream and magnetic coupling between a transmission magnetic element and a receiving magnetic element. The pulse stream is modulated by an input audio frequency signal in the time domain, for example, through pulse position modulation, pulse width modulation or pulse symmetry modulation. The receiving magnetic element is coupled to a demodulator circuit which detects the transmitted pulses induced in the receiving magnetic element and reproduces the audio frequency signal. Transmission over short range is thus efficiently accomplished through magnetic coupling in a simple, low cost, low power consumption communication system.

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