REVERSIBLE PERSONAL AUDIO DEVICE CABLE COUPLING

2014 ◽  
Vol 135 (1) ◽  
pp. 568
Author(s):  
Paul G. Yamkovoy
Keyword(s):  
Audio Device

Fall Detection via Inaudible Acoustic Sensing

2021 ◽  
Vol 5 (3) ◽  
pp. 1-21
Author(s):  
Jie Lian ◽  
Xu Yuan ◽  
Ming Li ◽  
Nian-Feng Tzeng
Keyword(s):  
Continuous Wave ◽  
Detection System ◽  
Fall Detection ◽  
Superior Performance ◽  
Medical Assistance ◽  
Acoustic Sensing ◽  
Value Decomposition ◽  
Human Motions ◽  
Audio Device ◽  
Fall Accidents

The fall detection system is of critical importance in protecting elders through promptly discovering fall accidents to provide immediate medical assistance, potentially saving elders' lives. This paper aims to develop a novel and lightweight fall detection system by relying solely on a home audio device via inaudible acoustic sensing, to recognize fall occurrences for wide home deployment. In particular, we program the audio device to let its speaker emit 20kHz continuous wave, while utilizing a microphone to record reflected signals for capturing the Doppler shift caused by the fall. Considering interferences from different factors, we first develop a set of solutions for their removal to get clean spectrograms and then apply the power burst curve to locate the time points at which human motions happen. A set of effective features is then extracted from the spectrograms for representing the fall patterns, distinguishable from normal activities. We further apply the Singular Value Decomposition (SVD) and K-mean algorithms to reduce the data feature dimensions and to cluster the data, respectively, before input them to a Hidden Markov Model for training and classification. In the end, our system is implemented and deployed in various environments for evaluation. The experimental results demonstrate that our system can achieve superior performance for detecting fall accidents and is robust to environment changes, i.e., transferable to other environments after training in one environment.

Perceived Importance of Visual and Audio Device Use During Instant Messaging Scales

2007 ◽  
Author(s):  
Jochen Peter ◽  
Patti M. Valkenburg ◽  
Alexander P. Schouten
Keyword(s):  
Instant Messaging ◽  
Perceived Importance ◽  
Device Use ◽  
Audio Device

scholarly journals Wireless Power Hanger Pad for Portable Wireless Audio Device Power Charger Application

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 419
Author(s):  
Win-Jet Luo ◽  
C. Bambang Dwi Kuncoro ◽  
Yean-Der Kuan
Keyword(s):  
Power Transmission ◽  
Evaluation Criteria ◽  
Wireless Power ◽  
Transmission Distance ◽  
Coil Diameter ◽  
Battery Capacity ◽  
Power Transfer Efficiency ◽  
Commercial Off The Shelf ◽  
Flat Spiral ◽  
Audio Device

Since the portability feature has been introduced in headphone development, this device now uses a battery as the main built-in power. However, the battery has limited power capacity and a short lifetime. Battery substitution and a conventional battery charger method is an ineffective, inflexible inconvenience for enhancing the user experience. This paper presents an innovative portable audio device battery built-in charger method based on wireless power technology. The developed charging device is composed of a headphone hanger pad for the wireless headphone and a charging pad for the portable wireless audio device battery charging. Circular flat spiral air-core coil was designed and evaluated using a numerical method to obtain optimal vertical magnetic field distribution based on the proposed evaluation criteria. A coil has inner coil diameter of 25 mm, outer coil diameter of 47.8 mm, wire diameter of 0.643 mm, the pitch of 0.03 mm and a number of turns of 17 was chosen to be implemented on the transmitter coil. A magnetic induction technique was adopted in the proposed wireless power transmission module which was implemented using commercial off-the-shelf components. For experimental and validation purposes, a developed receiver module applied to the commercial wireless headphone and portable audio speaker have a built-in battery capacity at 3.7 V 300 mAh. The experimental results show that the wireless power hanger pad prototype can transfer a 5 V induction voltage at a maximum current of 1000 mA, and the power transfer efficiency is around 70%. It works at 110 kHz of operation frequency with a maximum transmission distance of about 10 mm and takes 1 h to charge fully one 3.7 V 300 mAh polymer lithium battery.

Recreational bone conduction audio device, system

2008 ◽  
Vol 123 (6) ◽  
pp. 4033
Author(s):  
Sheldon M. Retchin ◽  
Martin Lenhardt
Keyword(s):  
Bone Conduction ◽  
Audio Device

Personal portable audio device

1987 ◽  
Vol 82 (5) ◽  
pp. 1869-1869
Author(s):  
Masanobu Sato
Keyword(s):  
Audio Device
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