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2. Zoom H4 Handy Recorder - Wikipedia

   en.wikipedia.org/wiki/Zoom_H4_Handy_Recorder

   The H4 is shorter than a pencil Field recording with H4 on a simple tripod H2 and H4 with 10 eurocents for scale. The H4 Handy Recorder is a handheld digital audio recorder from Zoom, featuring built-in condenser microphones in an X-Y stereo pattern, [1] priced from around US$280 depending upon memory capacity as of 2011.

3. Noise-canceling microphone - Wikipedia

   en.wikipedia.org/wiki/Noise-canceling_microphone

   The internal electronic circuitry of an active noise-canceling mic attempts to subtract noise signal from the primary microphone. The circuit may employ passive or active noise canceling techniques to filter out the noise, producing an output signal that has a lower noise floor and a higher signal-to-noise ratio.

4. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   Most external microphone designs are of either omnidirectional or noise-canceling type. Noise-canceling microphone headsets use a bi-directional microphone as elements. A bi-directional microphone's receptive field has two angles only. Its receptive field is limited to only the front and the direct opposite back of the microphone.

5. Today only, these Anker noise-cancelling headphones are just ...

   www.aol.com/lifestyle/fans-noise-cancelling...

   "The battery life is top of class. 40 hours is not an exaggeration, slightly less with noise cancelling turned on. Not surprising since the headphones come from Soundcore, an Anker brand, known ...

6. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Noise-cancelling aviation headsets are now commonly available. [5] [6] In 1989, Bose Corporation introduced its "Series I Aviation Headset" which became the first commercially available ANR headset. It included a noise-cancelling function and was powered either by NiCad batteries (with a claimed battery life of 8 hours) or by power from the ...

7. Stenomask - Wikipedia

   en.wikipedia.org/wiki/Stenomask

   The purpose of a stenomask is to allow a person to speak without being heard by other people, and to keep background noise away from the microphone. A stenomask is useful for speech recognition applications, because it allows voice transcription in noisy environments. Perhaps more importantly, a stenomask silences the user's voice so that it ...