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2. Best noise-canceling headphones, according to Consumer Reports

   www.aol.com/news/best-noise-canceling-headphones...

   Learn more about Select and Consumer Reports. The story goes that Amar Bose, founder of the audio company that bears his name, got the idea for noise-canceling headphones one day in 1978 when he ...

3. 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.

4. 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.

5. Zoom H2 Handy Recorder - Wikipedia

   en.wikipedia.org/wiki/Zoom_H2_Handy_Recorder

   The H2 Digital Handy Recorder H2 in use as a USB audio input device H2 and H4 with 10 eurocents for scale. The H2 Handy Recorder is a handheld digital audio recorder from Zoom first announced at the NAMM Show in February 2007. It records very high quality digital stereo or 4-channel audio on a hand-held unit, and has been called "the studio on ...

6. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Most noise-cancelling headsets in the consumer market generate the noise-cancelling waveform in real time with analogue technology. In contrast, other active noise and vibration control products use soft real-time digital processing. According to an experiment conducted to test how lightweight earphones reduced noise as compared to commercial ...

7. 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.