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Ultrasonic MODEM by Phase Shift Keying

A method of realizing an ultrasonic MODEM by binary phase shift keying using two Lamb wave devices is described. The device operates as a phase shifter for constructing a binary phase shifted modulation signal, and as a comparator with a reference synchronous signal for demodulation. The device has two delay lines with a 180° acoustic phase difference in one substrate. The operation principle for the MODEM is given with experimental confirmation.