Fecha de publicación: -- Fuente: WIPO "tomato" Described is a system for propelling an object by application of acoustic waves, the system comprising: an array of acoustic transducers, each acoustic transducer being operable to emit a respective acoustic wave in response to an actuation signal; and a controller configured to: generate an actuation signal for each of the acoustic transducers in the array such that the respective acoustic waves emitted by the acoustic transducers interact at a target location associated with the object to exert a force on the object, thereby propelling the object The force may be an impulsive force. The force may gradually build to a maximum magnitude.