抄録
Broad-band parametric signal generated by the self-demondulation effect of amplitude-modulated wave in an acoustic tube has been discussed in this paper. First, the fundamental nature of transient parametric signal by a large amplitude pulse has been given. The theory presented here has been basically dependent on the Merklinger's description [J. Acoust. Soc. Am. 58, 784-787 (1975)]. Although the theory excludes wall effect of the tube, it satisfactorily agrees to the experimental data. Next, the problem of transmitting a continuous broad-band signal is treated. For the modulation of primary wave, a new type of modulation, that is, squarely rooted amplitude-modulation has been proposed, and it has been concluded that harmonic distortions of reproduced signal are less than those by double- and single-sideband waves.
