منابع مشابه
Noise in miniature microphones.
The internal noise spectrum in miniature electret microphones of the type used in the manufacture of hearing aids is measured. An analogous circuit model of the microphone is empirically fit to the measured data and used to determine the important sources of noise within the microphone. The dominant noise source is found to depend on the frequency. Below 40 Hz and above 9 kHz, the dominant sour...
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A system for accurate localization and tracking of remote objects is introduced, which employs a reference frame of four coplanar ultrasound sources as transmitters and miniature microphones that equip the remote objects as receivers. The transmitters are forced to emit pulses in the 17 40 kHz band. A central processing unit, knowing the positions of the transmitters and the time of flight of t...
متن کاملFly-ear Inspired Miniature Directional Microphones: Modeling and Experimental Study
To address the challenges in developing miniature directional microphones, a novel micro-fabricated directional microphone inspired by the superacute ears of the parasitoid fly Ormia ocharacea is presented in this paper. It consists of two clamped circular silicon diaphragms structurally coupled by an oxide/nitride composite bridge. The separation between the diaphragm centers is 1.25 mm, about...
متن کاملMiniature wireless microphones reveal vocal relationships in a group of small laboratory animals
The spread in transmitting frequency is used to enable the simultaneous recording of up to 12 animals. For each animal one needs a separate receiver. Transmitting frequency is about 300 MHz. All experiments were done indoors. Crossed yagi antennae (Winkler Spezialantennen, Kreuzdipol 300, directional antenna tuned at 300 MHz) were connected to AOR 8600 receivers (AOR, Ltd., Japan) that were mod...
متن کاملMiniaturized Electrets
This paper describes the realization process of small-size electrets by using techniques generally applied in the fabrication of integrated circuits and microsensors. In the first part of the paper, attention is paid to the different electret decay mechanisms and their relative contribution to the overall stability of miniaturized electrets. Then, a process is described by which polymer electre...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1972
ISSN: 0001-4966
DOI: 10.1121/1.1981789