Direction control of a parametric speaker

Author

Akahori, Hajime ; Furuhashi, Hideo ; Shimizu, Maiko

Author_Institution

Dept. Electr. & Electron. Eng., Aichi Inst. of Technol., Toyota, Japan

fYear

2014

fDate

3-6 Sept. 2014

Firstpage

2470

Lastpage

2473

Abstract

In this study, we developed a parametric speaker system and analyzed the performance characteristics, wherein the direction of the audible sound wave can be electrically controlled. The system consists of an ultrasonic array transmitter with 144 ultrasonic transducer elements and field programmable gate array (FPGA) signal controllers. The phases of the amplitude-modulated signals for each transducer are controlled at 1 μs temporal resolution with ring buffers 511 μs in length. The direction can be controlled within a range of 15°, with a 2° resolution.

Keywords

acoustic parametric devices; acoustic signal processing; array signal processing; field programmable gate arrays; signal resolution; ultrasonic transducer arrays; FPGA signal controllers; amplitude-modulated signal phase; audible sound wave direction; direction control; field programmable gate array signal controllers; parametric speaker system; ring buffers; temporal resolution; ultrasonic array transmitter; ultrasonic transducer elements; Delays; Logic gates; Silicon compounds; FPGA; direction control; parametric; speaker;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium (IUS), 2014 IEEE International

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.2014.0616

Filename

6931772