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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. 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 ...

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. Variable Control Voice Actuator - Wikipedia

   en.wikipedia.org/wiki/Variable_Control_Voice...

   The term Variable Control Voice Actuator (VCVA) refers to a digital recording technology developed by Olympus, which is implemented in many of their digital voice recorders. [1] It prevents the recording of silence, so pauses in a speaker's dictation do not waste time, power or recording space.

6. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   The microphone arm of headsets may carry an external microphone or be of the voice tube type. External microphone designs have the microphone housed in the front end of the microphone arm. Voicetube designs are also called internal microphone design, and have the microphone housed near the earpiece, with a tube carrying sound to the microphone.

7. 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.