Feasibility study on a highly-directional parametric array loudspeaker applicable to mobile devices

2017 ◽  
Vol 141 (5) ◽  
pp. 4017-4017
Author(s):  
Kyounghun Been ◽  
Hongmin Ahn ◽  
Jin-Young Kim ◽  
In-Dong Kim ◽  
Joung Hoa Kim ◽  
...  
Keyword(s):  
Mobile Devices ◽  
Feasibility Study ◽  
Parametric Array

Design and Feasibility Study: Customized Virtual Buttons for Electronic Mobile Devices

2019 ◽  
Vol E102.A (4) ◽  
pp. 668-671
Author(s):  
Seungtaek SONG ◽  
Namhyun KIM ◽  
Sungkil LEE ◽  
Joyce Jiyoung WHANG ◽  
Jinkyu LEE
Keyword(s):  
Mobile Devices ◽  
Feasibility Study

scholarly journals A Critical Step to Using a Parametric Array Loudspeaker in Mobile Devices

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4449
Author(s):  
Hongmin Ahn ◽  
Kyounghun Been ◽  
In-Dong Kim ◽  
Chong Hyun Lee ◽  
Wonkyu Moon
Keyword(s):  
Signal Processing ◽  
Mobile Devices ◽  
Processing Unit ◽  
Primary Wave ◽  
Large Power ◽  
Frequency Wave ◽  
Parametric Array ◽  
Half Power ◽  
Device Size ◽  
Signal Processing Unit

A parametric array (PA) loudspeaker is a highly directional audio source that might grant one's convenience if it is used with mobile devices. However, conventional PA loudspeakers is almost impossible to apply in mobile devices using a battery because of the large power consumption and large device size. In this study, a PA loudspeaker system (PALS) was fabricated and evaluated to show that those difficulties could be overcome to apply it to mobile devices. In order to construct a PALS for demonstration, a power amplifier and signal-processing unit should also be properly designed and built. The PA source transducer should also be designed and built for a mobile device application. These components were integrated into a single PALS. The PALS generated a 125-dB primary wave and 62 dB of a different frequency wave (DFW) through the PA at 0.45 m in a 3 m × 3 m × 2 m semi-anechoic chamber. We confirmed that the half-power bandwidth (HPBW) formed a 6° beam at 83 kHz of DFW and 90 kHz of the primary wave (PW), and the HPBW formed a 7.3° beam at 5 kHz of DFW and a 7.1° beam at 10 kHz of DFW, respectively. Lastly, the power required was 6.65 W without a matching circuit, and 3.25 W with such a circuit.

scholarly journals Adaptation of the WHO e-mhGAP-Intervention Guide app for mobile devices in Nepal and Nigeria: Protocol for a feasibility study (Preprint)

10.2196/24115 ◽  
2020 ◽  
Author(s):  
Tatiana Taylor Salisbury ◽  
Brandon A. Kohrt ◽  
Ioannis Bakolis ◽  
Mark JD Jordans ◽  
Louise Hull ◽  
...  
Keyword(s):  
Mobile Devices ◽  
Feasibility Study

Feasibility Study of the Development, Implementation, and Evaluation of Computer-Based Job and Occupational Data Collection Methods

1998 ◽  
Author(s):  
J. L. Mitchell ◽  
Winston Bennett ◽  
J. J. Weissmuller ◽  
R. L. Gosc ◽  
Patricia Waldroop ◽  
...  
Keyword(s):  
Data Collection ◽  
Feasibility Study ◽  
Data Collection Methods ◽  
Computer Based ◽  
Collection Methods
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