Results 1 to 10 of about 45,787 (175)

Laser‐Architected Shape‐Configurable Vertical Graphene Thermoacoustic Loudspeakers for 3D Acoustic Emission [PDF]

Advanced Science
Recent advances in thermoacoustic (TA) loudspeakers have focused on freeform, conformal audio systems that enable conformal integration, spatial sound control, and seamless transformation between 2D and 3D geometries. However, their practical use remains
TaeGyeong Lim, Se Young Lee, Dohyung Lee, Baek Heon Lim, Jeongbo Lee, Wooseok Song, Sun Sook Lee, Sungwoong Park, Jin Kim, Soonmin Yim, Ki‐Seok An, Saewon Kang   +11 more
doaj   +2 more sources

AudioUnlock: Device-to-Device Authentication via Acoustic Signatures and One-Class Classifiers [PDF]

Sensors
Acoustic fingerprints can be used for device-to-device authentication due to manufacturing-induced variations in microphones and speakers. However, previous works have focused mostly on recognizing single devices from a set of multiple devices, which may
Alfred Anistoroaei, Patricia Iosif, Camelia Burlacu, Adriana Berdich, Bogdan Groza   +4 more
doaj   +2 more sources

Selecting Program Material by Audio Features for Low-Frequency Perceptual Evaluation of Loudspeakers

Applied Sciences, 2021
The program material is of great importance for the results of the listening tests on loudspeakers, while the process of how to select the program material remains ambiguous.
Pei Yu, Shufeng Zhang, Xuelei Feng, Ziyun Liu, Yong Shen   +4 more
doaj   +1 more source

Spherical harmonic representation of the observed directional wave front in the time domain [PDF]

JASA Express Letters, 2022
Sound field reproduction algorithms require loudspeaker directivity, which is usually measured at discrete frequencies. A time domain model of loudspeaker directivity benefits broadband applications. This Letter proposes the concept of a directional wave
Jiarui Wang, Thushara Abhayapala, Prasanga Samarasinghe, Jihui Aimee Zhang   +3 more
doaj   +1 more source

The effect of housing volume of a converting loudspeaker on the output electric power of a loudspeaker-based acoustic energy harvester

Journal of Physics: Theories and Applications, 2020
Acoustic energy harvester is a device that converts sound or acoustic energy into electrical energy. Generally, the main components of this instrument are an acoustic transducer and an acoustic resonator.
Ikhsan Setiawan
doaj   +1 more source

The construction and testing of an acoustic energy harvester consisting of a Helmholtz resonator and a loudspeaker

Journal of Physics: Theories and Applications, 2020
Sound energy is all around but not properly utilized despite being a source of electricity. This research was conducted to construct and test an acoustic energy harvester consisting of a Helmholtz resonator and a loudspeaker.
Ikhsan Setiawan, Mulaiyinatus Sifa
doaj   +1 more source

Drone Applications Fighting COVID-19 Pandemic—Towards Good Practices

Drones, 2022
Of the recent epidemics, the impact of the COVID-19 pandemic has been particularly severe, not only putting our health at risk, but also negatively affecting our daily lives.
Ágoston Restás
doaj   +1 more source

Total Harmonic Distortion of a Piezoelectric MEMS Loudspeaker in an IEC 60318-4 Coupler Estimation Using Static Measurements and a Nonlinear State Space Model

Micromachines, 2021
We propose a method to evaluate the Total Harmonic Distortion generated by a cantilever-based PZT loudspeaker inside an IEC 60318-4 coupler. The model is validated using experimental data of a commercial loudspeaker.
Romain Liechti, Stéphane Durand, Thierry Hilt, Fabrice Casset, Christophe Poulain, Gwenaël Le Rhun, Franklin Pavageau, Hugo Kuentz, Mikaël Colin   +8 more
doaj   +1 more source

Effect of Loudspeakers on the In Situ Electric Field in a Driver Body Model Exposed to an Electric Vehicle Wireless Power Transfer System

Energies, 2020
This study computationally evaluates the effect of loudspeakers on the in situ electric field in a driver body model exposed to the magnetic field from a wireless power transfer (WPT) system in an electric vehicle (EV), one with a body made of carbon ...
Junqing Lan, Akimasa Hirata
doaj   +1 more source

Dynamic analysis using finite element method for a nonlinear spring-supported disk: Technique to reduce second-order distortion due to diaphragm shape

Mechanical Engineering Journal, 2017
This research aims to reduce the second-order distortion due to diaphragm vibration. The quadratic term of the restoring force of nonlinear springs varies in the pulling and compression directions.
Mitsuharu WATANABE, Takao YAMAGUCHI, Manabu SASAJIMA, Tatsushi SASANUMA, Yoshio KOIKE   +4 more
doaj   +1 more source