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  2. Quadraphonic sound - Wikipedia

    en.wikipedia.org/wiki/Quadraphonic_sound

    Quadraphonic sound. Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for the reproduction of sound signals that are (wholly or in part) independent of one ...

  3. Surround sound - Wikipedia

    en.wikipedia.org/wiki/Surround_sound

    Surround sound. Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener ( surround channels ). Its first application was in movie theaters. Prior to surround sound, theater sound systems commonly had three screen channels of sound that ...

  4. Sound Blaster - Wikipedia

    en.wikipedia.org/wiki/Sound_Blaster

    The Sound Blaster Z is the baseline card of the series. Some of its main features are Cirrus Logic 116 dB signal-to-noise ratio (SNR) digital-to-analog converters (DACs), a dedicated headphone jack with 600 ohm amplifier, and is bundled with a Beamforming Microphone that captures sound in a specific direction. One can switch between listening ...

  5. Direct-field acoustic testing - Wikipedia

    en.wikipedia.org/wiki/Direct-field_acoustic_testing

    Spacecraft test setup. Direct-field acoustic testing, or DFAT, is a technique used for acoustic testing of aerospace structures by subjecting them to sound waves created by an array of acoustic drivers. [1] The method uses electro-dynamic acoustic speakers, arranged around the test article to provide a uniform, well-controlled, direct sound ...

  6. Audio feedback - Wikipedia

    en.wikipedia.org/wiki/Audio_feedback

    Audio feedback (also known as acoustic feedback, simply as feedback) is a positive feedback situation that may occur when an acoustic path exists between an audio output (for example, a loudspeaker) and its audio input (for example, a microphone or guitar pickup ). In this example, a signal received by the microphone is amplified and passed out ...

  7. Boundary microphone - Wikipedia

    en.wikipedia.org/wiki/Boundary_microphone

    Boundary microphone (Audio-Technica ATM87R) A boundary microphone (or pressure zone microphone) is one or more small omnidirectional or cardioid condenser mic capsule (s) positioned near or flush with a boundary (surface) such as a floor, table, or wall. The capsule (s) are typically mounted in a flat plate or housing.

  8. Use POP or IMAP to sync AOL Mail on a third-party app or ...

    help.aol.com/articles/how-do-i-use-other-email...

    There are two different protocols you can choose when setting up a third-party email app: POP or IMAP. POP downloads a copy of your emails from your account (mail.aol.com) to the app. This means that if you delete an email from your account after it's been downloaded, the downloaded copy remains in the app. Additionally, POP only downloads ...

  9. Binaural recording - Wikipedia

    en.wikipedia.org/wiki/Binaural_recording

    Binaural recording. Binaural recording is a method of recording sound that uses two microphones, arranged with the intent to create a 3D stereo sound sensation for the listener of actually being in the room with the performers or instruments. This effect is often created using a technique known as dummy head recording, wherein a mannequin head ...