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A Study of Directional Patterns of Ultrasonic Parametric Array

Rakov Denis S., Rakov Aleksandr S., Kudryavtsev Andrey N., Krasnenko Nikolay P., Chursin Yury A., Murin Maksim A.

Archives of Acoustics

2019

Vol. 44, No. 2

301--307

The paper presents results of numerical calculations and experimental data on the directional pattern of two 38-element parametric arrays composed of ultrasound sources. Two types of antenna arrays are considered, namely with parallel and coaxial connections of ultrasonic transducers (elements). The results of selecting and functional testing of unit elements are described in this paper. It is found that in the coaxial element connection of the antenna array, the level of side lobes is higher than that in the paralel element connection.

Measurements and Simulations of Engineered Ultrasound Loudspeak

Bratoszewski P., Cichowski J., Czyżewski A.

Computational Methods in Science and Technology

2015

Vol. 21, No. 3

151--160

Simulation and measurement results of the sound emitted from an ultrasound custom-made system with high spatial directivity are presented. The proposed system is using modulated ultrasound waves which demodulate in nonlinear medium resulting in audible sound. The system is aimed at enhancing the users’ personal audio space, therefore the measurements are performed using the Head and Torso Simulator which provides realistic reproduction of the human auditory system. Based on the measurements of the sound emitted from the two parametric arrays of ultrasonic transducers the directivity of the proposed system and the interaural crosstalk characteristics are determined. Application of the system concerns creating a personal audio space for users of mobile platforms, such as notebooks, and applying 3D audio algorithms without the need of using headphones.