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2. 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.

3. Noise-cancelling headphones - Wikipedia

   en.wikipedia.org/wiki/Noise-cancelling_headphones

   Simplified graphical depiction of active noise reduction. To cancel the lower-frequency portions of the noise, noise-cancelling headphones use active noise control or ANC.A microphone captures the targeted ambient sounds, and a small amplifier generates sound waves that are exactly out of phase with the undesired sounds.

4. Active noise control - Wikipedia

   en.wikipedia.org/wiki/Active_noise_control

   Sound is captured from the microphone(s) furthest from the mouth (the noise signal(s)) and from the one closest to the mouth (the desired signal). The signals are processed to cancel the noise from the desired signal, producing improved voice sound quality. In some cases, noise can be controlled by employing active vibration control. This ...

5. 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.

6. 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.

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 ...