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  2. Long-range acoustic device - Wikipedia

    en.wikipedia.org/wiki/Long-range_acoustic_device

    A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance. It has been used as a method of crowd control , which has caused permanent hearing damage , having an extremely high decibel capacity (up to 160 dB measured at one ...

  3. The Mosquito - Wikipedia

    en.wikipedia.org/wiki/The_Mosquito

    The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...

  4. Texas Instruments SN76489 - Wikipedia

    en.wikipedia.org/wiki/Texas_Instruments_SN76489

    The Game Gear's version includes an additional flag register that designates which speaker(s) each audio channel are output (left, right, or both). The periodic noise is 16 stages long rather than 15; this makes a significant difference for music/programs which use periodic noise, as sounds will play at 6.25% lower pitch than on the TI-made chips.

  5. Signal generator - Wikipedia

    en.wikipedia.org/wiki/Signal_generator

    Pitch generators are typically used in conjunction with sound level meters, when measuring the acoustics of a room or a sound reproduction system, and/or with oscilloscopes or specialized audio analyzers. Many pitch generators operate in the digital domain, producing output in various digital audio formats such as AES3, or SPDIF.

  6. Piezoelectric speaker - Wikipedia

    en.wikipedia.org/wiki/Piezoelectric_speaker

    A piezoelectric speaker (also known as a piezo bender due to its mode of operation, and sometimes colloquially called a "piezo", buzzer, crystal loudspeaker or beep speaker) is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and ...

  7. List of sound chips - Wikipedia

    en.wikipedia.org/wiki/List_of_sound_chips

    Sega Melody Generator 1981 1 Sega G80 arcade system board [24] Sharp Corporation: Sharp LR35902: 1989 4 Game Boy, Game Boy Color, Game Boy Advance: In Game Boy Advance, it's used for Game Boy/Game Boy Color mode and supports software-mixed PCM as a secondary function. [25] Sharp SM8521 1997 1 Game.com: Noise generator Sunsoft: Sunsoft 5B: 1992 3

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  9. Sound amplification by stimulated emission of radiation

    en.wikipedia.org/wiki/Sound_amplification_by...

    An example is a common sound amplification system with a microphone, amplifier and speaker. When the microphone is in front of the speaker, we hear an annoying whistle. This whistle is generated without extra contribution from the sound source, and is self-reinforced and self-sufficient while the microphone is somewhere in front of the speaker.

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