Only the best electret microphones rival good DC-polarized units in terms of noise level and quality; electret microphones lend themselves to inexpensive mass-production, while inherently expensive non-electret condenser microphones are made to higher quality.
32.
In the new polymer systems, the required cavities are formed by means of e . g . stamps, templates, laser cutting, etc . Thermo-forming of layer systems from electret films led to thermally more stable ferroelectrets.
33.
:Essentially all modern microphones used with low-end electronics ( such as computers, cell phones, speakerphones, etc . ) are electret microphones; they're the cheapest to integrate into the rest of the electronics and cheap themselves.
34.
Power is necessary for establishing the capacitor plate voltage, and is also needed to power the microphone electronics ( impedance conversion in the case of electret and DC-polarized microphones, demodulation or detection in the case of RF / HF microphones ).
35.
Electret materials have been known since the 1920s, and were proposed as condenser microphone elements several times, but were considered impractical until the foil electret type was invented at Bell Laboratories in 1962 by Jim West, using a thin metallized Teflon foil.
36.
Electret materials have been known since the 1920s, and were proposed as condenser microphone elements several times, but were considered impractical until the foil electret type was invented at Bell Laboratories in 1962 by Jim West, using a thin metallized Teflon foil.
37.
An electret is a stable dielectric material with a quasi-permanently embedded static electric charge ( which, due to the high resistance of the material, will not decay for time periods of up to hundreds of years ) and / or a quasi-permanently oriented dipole polarization.
38.
This was delayed from the original May 2007 shipping date due as an additional microphone was added; the original three-microphone electret condenser microphone capsules are arranged to allow stereo recording and have user-selectable parameters to allow for either a 90-or 120-degree pickup angle.
39.
James E . West, a Bell Laboratories fellow at Lucent Technologies who was an inventor of the high fidelity foil electret technology used in 90 percent of today's microphones, advocated giving children a strong base in science and mathematics and a creative environment to encourage the idea of inventing.
40.
In 1969, Knowles amplifies Neil Armstrong's words from the moon during the Apollo 11 mission with various acoustic products, and In 1971, Knowles introduces first sub-miniature electret condenser microphone . In 1972, Knowles introduced a real-ear simulator product names as KEMAR ( Knowles Electronics Manikin for Acoustics Research ), which left Knowles and become part of a Dennmark company, Gunnar Rasmussen's Acoustic Systems ( G . R . A . S ).
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