抄録
Experimental data for propagation and beam pattern of parametric pulses have been presented in this paper. Two pulses are generated by finite amplitude acoustic wave with rectangular envelope. As sound source level increases, primary and harmonic components are saturated, however, parametric pulse is not saturated. Experimental results are explained by the theory developed by Merklinger [J. Acoust. Soc. Am. 58, 784-787 (1975)]. A new type of signal transmission using the conception of the digital communication has been proposed. Namely, the parametric pulse train that has the modulated amplitude with desired signal are generated by the primary wave with sawtooth envelope. It has been showed that this method is able to overcome ground noise and reduce the load of the sound source.
