Acoustic communication device and acoustic signal...

Communications – electrical: acoustic wave systems and devices – Underwater system – Telemetering

Reexamination Certificate

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Details

C367S904000, C340S870180, C340S870190, C340S870250, C340S870260, C073S866500, C073S861230, C137S624110

Reexamination Certificate

active

07027357

ABSTRACT:
The present invention provides an acoustic transmitter for sequentially transmitting a plurality of pulse signals by sound. Each of the plurality of pulse signals is a signal of at least one modulated carrier wave, which has a predetermined frequency. The carrier wave of each of the pulse signals has a mutually different frequency. The transmitter performs amplitude modulation and/or phase modulation based on transmission information, and modulation by a signal indicating a window function, for the carrier wave of each of pulse signals. Then the transmitter sequentially transmits the plurality of pulse signals by sound.

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Yinghui Li et al., “Experimental Study on Ultrasonic Signal Transmission Within the Water-Filled Pipes”, Proc. of Fourth Annual Conference on Mechatronics and Machine Vision in Practice, Sep. 23-25, 1997, pp. 93-98.

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