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Crystal earpieces are usually monaural devices with very low sound fidelity, but high sensitivity and impedance. Their peak use was probably with 1960s era transistor radios and hearing aids . They are not used with modern portable media players due to unacceptable sound quality.
Headsets are made with either a single-earpiece (mono) or a double-earpiece (mono to both ears or stereo). The microphone arm of headsets is either an external microphone type where the microphone is held in front of the user's mouth, or a voicetube type where the microphone is housed in the earpiece and speech reaches it by means of a hollow tube.
While an accelerating, increasing speed, airstream has a low downstream static pressure, the sharp turn from linear to radial flow is the cause of a region of very low pressure around the blower exit hole. This is the cause of a net force on the object in the direction normal to the side with higher local pressure.
The new iPhone 6 and 6 Plus each have a sensor that gives readings for barometric pressure. Barograph (free), displays real-time pressure data from that sensor. Weather watchers will know dropping ...
Sound that's much closer to the front port than to the rear will make more of a pressure gradient between the front and back of the diaphragm, causing it to move more. The microphone's proximity effect is adjusted so that flat frequency response is achieved for sound sources very close to the front of the mic – typically 1 to 3 cm. Sounds ...
The iPhone Stereo Headset was introduced in 2007 and was bundled with the original iPhone and iPhone 3G, and featured a control capsule in-line with the left earbud's wire with a microphone and a single button, actuated by squeezing the unit, which can be programmed to control calls, presentations, music and video playback, launch Siri, or take pictures with the Camera application.
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In 2022, researchers at the Taipei Veterans General Hospital in Taiwan compared the performance of AirPods 2 and the original AirPods Pro using Live Listen on an iPhone or iPad to compare to medical hearing aids. Oticon Opn 1 was the high-end comparison, with Bernafon MD1 as the more affordable alternative. The performance of the systems was at ...
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