Parametric Array Using Amplitude Modulated Pulse Trains: Experimental Evaluation of Beamforming and Single Sideband Modulation
Paper in proceeding, 2021

We present a parametric array system realized with a microcontroller and MOSFET drivers. Pulse train signals with fundamental frequency of 40 kHz are generated by the microcontroller. The pulse trains are amplitude modulated by exploiting the switching mechanism of the MOSFETs. The higher-order harmonics are attenuated by the band-pass characteristic of the ultrasonic transducers, emitting only the carrier frequency and the sideband components. The sound beam can be steered by applying phase shifts to the pulse signals, which can be implemented by relatively inexpensive hardware. A new single sideband modulation is also introduced, where the upper sidebands of two double sideband modulation signals are acoustically cancelled. The proposed approaches for beamforming and single sideband modulation are evaluated by anechoic measurements.

parametric loudspeaker



Nara Hahn

University of Rostock

Jens Ahrens

Chalmers, Architecture and Civil Engineering, Applied Acoustics

Carl Andersson

Chalmers, Architecture and Civil Engineering, Applied Acoustics

151st Audio Engineering Society Convention 2021

978-171383945-3 (ISBN)

151st Audio Engineering Society Convention 2021
New York, NY, USA,

Levitation with localised tactile and audio feedback for mid-air interactions (Levitate)

European Commission (EC) (EC/H2020/737087), 2017-01-01 -- 2020-12-31.

Areas of Advance

Information and Communication Technology

Subject Categories

Communication Systems



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