| 摘要 |
A method and a system of transmitting a binary data sequence in voice form, the system comprising a pilot oscillator (OS), an FSK type modulator circuit (3) receiving said sequence, an intermediate processor circuit (5), and a piezoelectric transducer (P). A logic excitation signal is applied to the terminals (b1, b2) of the transducer (P) and is integrated by means of the capacitive portion of the impedance of the transducer (P) so as to reconstitute an acoustic signal having a sinusoidal waveform which is emitted by the transducer (P) at a voice frequency which differs depending on the logic state of the bit to be transmitted.
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