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  2. Microphone blocker - Wikipedia

    en.wikipedia.org/wiki/Microphone_blocker

    A microphone blocker is a cheap, simple accessory that provides countersurveillance against eavesdropping, for example recording eavesdropping from interception (like cellphone surveillance), or phone hacking, but it doesn't work on smartphones because they are controlled by software.

  3. Pop filter - Wikipedia

    en.wikipedia.org/wiki/Pop_filter

    A pop filter between microphone and singer in use during a recording session. A pop filter, pop shield or pop screen is a noise protection filter for microphones, typically used in a recording studio. It serves to reduce or eliminate popping sounds caused by the mechanical impact of fast-moving air on the microphone from plosives during ...

  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. Phantom power - Wikipedia

    en.wikipedia.org/wiki/Phantom_Power

    Phantom power button and indicator light. Phantom power, in the context of professional audio equipment, is DC electric power equally applied to both signal wires in balanced microphone cables, forming a phantom circuit, to operate microphones that contain active electronic circuitry. [1] It is best known as a convenient power source for ...

  6. Mobile phone jammer - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_jammer

    Mobile phone jammer. A mobile phone jammer or blocker is a device which deliberately transmits signals on the same radio frequencies as mobile phones, disrupting the communication between the phone and the cell-phone base station, effectively disabling mobile phones within the range of the jammer, preventing them from receiving signals and from ...

  7. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    Microphone. Shure Brothers microphone, model 55S, multi-impedance "Small Unidyne" dynamic from 1951. A microphone, colloquially called a mic (/ maɪk /), [1] or mike, [a] is a transducer that converts sound into an electrical signal.

  8. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    A public address system (or PA system) is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an ...

  9. 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.

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