EntityQ5280449· pop 5· linked from 11 articlesDirectional soundSign in to savefields of sound which spread less than most transmissionsConnectionsloudspeakerEntityFourier transformEntityHuygens–Fresnel principleEntitysignal processingEntitypink noiseEntityphased arrayEntitysonic weaponEntityomnidirectional antennaEntityelectrostatic loudspeakerEntitySound from ultrasoundEntityCategoriesAcousticsSoundUltrasound