Temat: electret - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Simultaneous Calibration of Multiple Microphones for Both Phase and Amplitude in an Impedance Tube
Autorzy:: Tóth, P.
Schram, C.
Powiązania:: https://bibliotekanauki.pl/articles/176334.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electret microphone
simultaneous microphone calibration
impedance tube
Opis:: This paper presents and compares microphone calibration methods for the simultaneous calibration of small electret microphones in a wave guide. The microphones are simultaneously calibrated to a reference microphone both in amplitude and phase. The calibration procedure is formulated on the basis of the damped plane wave propagation equation, from which the acoustics field along the wave guide is predicted, using several reference measurements. Different calibration models are presented and the methods were found to be sensitive to the formulation, as well as to the number of free parameters used during the reconstruction of the wave-field. The wave guide model based on five free parameters was found to be the preferred method for this type of calibration procedure.
Źródło:: Archives of Acoustics; 2014, 39, 2; 277-287
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: High-displacement electret-based energy harvesting system for powering leadless pacemakers from heartbeats
Autorzy:: Maamer, Bilel
Jaziri, Nesrine
Said, Mohamed Hadj
Tounsi, Fares
Powiązania:: https://bibliotekanauki.pl/articles/2202554.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electret-based system
electrostatic harvester
energy harvesting
heartbeats vibration
Opis:: In vivo biomedical devices are one of the most studied applications for vibrational energy harvesting. In this paper, we investigated a novel high-displacement device for harvesting heartbeats to power leadless implantable pacemakers. Due to the location peculiarities, certain constraints must be respected for the design of such devices. Indeed, the total dimension of the system must not exceed 5.9 mm to be usable within the leadless pacemakers and it must be able to generate accelerations lower than 0.25 m/s2 at frequencies of less than 50 Hz. The proposed design is an electrostatic system based on a square electret of dimension 4.5 mm. It is based on the Quasi-Concertina structure, which has a very low resonant frequency of 26.02 Hz and a low stiffness of 0.492 N/m, allowing it to be very useful in such an application. Using a Teflon electret charged at 1000 V, the device was able to generate an average power of 10.06 μW at a vibration rate of 0.25 m/s2 at the resonant frequency.
Źródło:: Archives of Electrical Engineering; 2023, 72, 1; 229--238
1427-4221
2300-2506
Pojawia się w:: Archives of Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Advances in Digitization of Microphones and Loudspeakers
Autorzy:: Kulka, Z.
Powiązania:: https://bibliotekanauki.pl/articles/177402.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: electret condenser microphone
digital microphone
CMOS-MEMS digital microphone
digital microphone array
sigma-delta ADC/DAC
digital loudspeaker
CMOS-MEMS digital loudspeaker
digital loudspeaker array
Opis:: The development of digital microphones and loudspeakers adds new and interesting possibilities of their applications in different fields, extended from industrial, medical to consumer audio markets. One of the rapidly growing field of applications is mobile multimedia, such as mobile phones, digital cameras, laptop and desktop PCs, etc. The advances have also been made in digital audio, particularly in direct digital transduction, so it is now possible to create the all-digital audio recording and reproduction chains potentially having several advantages over existing analog systems.
Źródło:: Archives of Acoustics; 2011, 36, 2; 419-436
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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