Abstract: Disclosed is a loudspeaker enclosure including: —at least two sources suitable for producing ultrasound signals, and—a supply designed to process and amplify at least one input signal so as to produce, for the sources, supply signals of the same frequency and of different phases, wherein the supply are configured to apply different gains and/or phase shifts to at least two different frequency components of at least one of the supply signals. Also disclosed is a method for signal modulation for such an ultrasonic loudspeaker enclosure.

Abstract: Disclosed is a loudspeaker enclosure including: —at least two sources suitable for producing ultrasound signals, and—a supply designed to process and amplify at least one input signal so as to produce, for the sources, supply signals of the same frequency and of different phases, wherein the supply are configured to apply different gains and/or phase shifts to at least two different frequency components of at least one of the supply signals. Also disclosed is a method for signal modulation for such an ultrasonic loudspeaker enclosure.

Abstract: A loudspeaker enclosure designed to convert an electrical input signal into sound signals is provided. The enclosure comprises a signal processor suitable for generating, from the electrical input signal, a modulated electrical signal using an ultrasonic carrier. The enclosure comprises a source suitable for producing ultrasonic signals from the modulated electrical signal and for broadcasting said ultrasonic signals through a medium. The carrier is chosen such that the sound signals are at least partially produced while the ultrasonic signals are passing through the medium. A buffer device is suitable for allowing the transmission of the modulated electrical signal to said at least two piezo-electric transducers of the group and for keeping the voltage observed at the terminals of said at least two piezo-electric transducers of the group substantially equal to the voltage observed at the output of the signal processor.

Abstract: A loudspeaker enclosure designed to convert an electrical input signal into sound signals is provided. The enclosure comprises a signal processor suitable for generating, from the electrical input signal, a modulated electrical signal using an ultrasonic carrier. The enclosure comprises a source suitable for producing ultrasonic signals from the modulated electrical signal and for broadcasting said ultrasonic signals through a medium. The carrier is chosen such that the sound signals are at least partially produced while the ultrasonic signals are passing through the medium. A buffer device is suitable for allowing the transmission of the modulated electrical signal to said at least two piezo-electric transducers of the group and for keeping the voltage observed at the terminals of said at least two piezo-electric transducers of the group substantially equal to the voltage observed at the output of the signal processor.