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Keywords = electro-acoustic gain ratio

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11 pages, 1678 KiB  
Article
Fitting Assistive Technology for People with Hearing Loss: The Importance of Remote Microphone Systems′ Electroacoustic Verification
by Regina Tangerino de Souza Jacob, Elaine Cristina Moreto Paccola, Érika Cristina Bucuvic and Manoel Henrique Salgado
Int. J. Environ. Res. Public Health 2021, 18(24), 13251; https://doi.org/10.3390/ijerph182413251 - 16 Dec 2021
Cited by 4 | Viewed by 5314
Abstract
The remote microphone system (RMS) must be appropriately working when fitting it in a person with hearing loss. For this verification process, the concept of transparency is adopted. If it is not transparent, the hearing aid (HA) may not capture the user’s voice [...] Read more.
The remote microphone system (RMS) must be appropriately working when fitting it in a person with hearing loss. For this verification process, the concept of transparency is adopted. If it is not transparent, the hearing aid (HA) may not capture the user’s voice and his peers appropriately, or the RMS may not have the advantage in gain needed to emphasize the speaker’s voice. This study investigates the influence of the receiver’s gain setting on the transparency of different brands and models of RMS and HAs. It is a retrospective chart review with 277 RMS from three distinct brands (RMA, RMB, and RMC) and HAs. There was an association of the receiver’s gain setting with the variables: brand of the transmitter/receiver (p = 0.005), neck loop’s receiver vs. universal and dedicated receivers (p = 0.022), and between brands of HA and transmitter/receiver (p < 0.001). RMS transmitter (odds ratio [OR = 7.9]) and the type of receiver (neckloop [OR = 3.4]; universal [OR = 0.78]) presented a higher risk of not achieving transparency in default gain, confirming and extolling the need to include electroacoustic verification in the protocol of fitting, verification, and validation of RMS and HA. Full article
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17 pages, 6559 KiB  
Article
The Effect of Electrical Impedance Matching on the Electromechanical Characteristics of Sandwiched Piezoelectric Ultrasonic Transducers
by Yuan Yang, Xiaoyuan Wei, Lei Zhang and Wenqing Yao
Sensors 2017, 17(12), 2832; https://doi.org/10.3390/s17122832 - 6 Dec 2017
Cited by 36 | Viewed by 9064
Abstract
For achieving the power maximum transmission, the electrical impedance matching (EIM) for piezoelectric ultrasonic transducers is highly required. In this paper, the effect of EIM networks on the electromechanical characteristics of sandwiched piezoelectric ultrasonic transducers is investigated in time and frequency domains, based [...] Read more.
For achieving the power maximum transmission, the electrical impedance matching (EIM) for piezoelectric ultrasonic transducers is highly required. In this paper, the effect of EIM networks on the electromechanical characteristics of sandwiched piezoelectric ultrasonic transducers is investigated in time and frequency domains, based on the PSpice model of single sandwiched piezoelectric ultrasonic transducer. The above-mentioned EIM networks include, series capacitance and parallel inductance (I type) and series inductance and parallel capacitance (II type). It is shown that when I and II type EIM networks are used, the resonance and anti-resonance frequencies and the received signal tailing are decreased; II type makes the electro-acoustic power ratio and the signal tailing smaller whereas it makes the electro-acoustic gain ratio larger at resonance frequency. In addition, I type makes the effective electromechanical coupling coefficient increase and II type makes it decrease; II type make the power spectral density at resonance frequency more dramatically increased. Specially, the electro-acoustic power ratio has maximum value near anti-resonance frequency, while the electro-acoustic gain ratio has maximum value near resonance frequency. It can be found that the theoretically analyzed results have good consistency with the measured ones. Full article
(This article belongs to the Section Physical Sensors)
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