| 摘要 |
Acoustic Deterrence A method and system of deterring mammalsis disclosedi nvolving incurring an acoustic startle responsecomprisingthe steps of:select ing a target order, family, genus or species to be deterred;selecting a rece ived level that is a predetermined level above a representative hearing thre shold of the targeted mammals; and,taking transmission loss into account, tr ansmitting an acoustic signal at a source levelrequired to create the select edreceived levelat a predetermined distance from the transmission point.The acoustic signal may comprise frequency components at which the aural sensiti vity of the targeted mammals is greater than that of selected other animals, preventing the disturbance of the selected other animals whilst deterring t he targeted mammals. In addition, a secondary conditioning sound may be play ed prior to the main acoustic signalto condition the mammals to avoid the ma in stimulus. Furthermore, using the same steps, an aversive stimulus may be played that elicits an avoidance without a startle reflex. The characteristi cs of these aversive sounds are those found to beunpleasant to humans. Accor dingly, the aversive sound is selected to have one or more of the following psychophysical features: high roughness; low tonality; high loudness; high s harpness. |
