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2. Sound level meter - Wikipedia

   en.wikipedia.org/wiki/Sound_level_meter

   A sound level meter (also called sound pressure level meter (SPL)) is used for acoustic measurements. It is commonly a hand-held instrument with a microphone. The best type of microphone for sound level meters is the condenser microphone, which combines precision with stability and reliability. [1]

3. Acoustical measurements and instrumentation - Wikipedia

   en.wikipedia.org/wiki/Acoustical_measurements...

   Dynamic range is a measure of how small you can measure a signal relative to the maximum input signal the device can measure. Expressed in decibels, the dynamic range is 20 log (Vmax/Vmin). For example, a device with an input range of ±10 V and a dynamic range of 110 dB will be able to measure a signal as small as 10 μV.

4. Sound limiter - Wikipedia

   en.wikipedia.org/wiki/Sound_limiter

   Sound limiters are commonly installed at live music venues, including private venues and particularly those that host wedding receptions with live wedding bands. [ citation needed ] The visual indicator on the limiter works most commonly on a “ traffic light ” system: green = no problem, amber = sound levels approaching the threshold, red ...

5. Audio system measurements - Wikipedia

   en.wikipedia.org/wiki/Audio_system_measurements

   The measurement is given in % and a lower number is better. Rumble The measure of the low frequency (many tens of Hz) noise contributed by the turntable of an analogue playback system. It is caused by imperfect bearings, uneven motor windings, vibrations in driving bands in some turntables, room vibrations (e.g., from traffic) that is ...

6. VU meter - Wikipedia

   en.wikipedia.org/wiki/VU_meter

   An analog VU meter with peak LED. A volume unit (VU) meter or standard volume indicator (SVI) is a device displaying a representation of the signal level in audio equipment.. The original design was proposed in the 1940 IRE paper, A New Standard Volume Indicator and Reference Level, written by experts from CBS, NBC, and Bell Telephone Laboratories. [1]

7. 10 Old Tech Gadgets Worth a Pretty Penny Today

   www.aol.com/10-old-tech-gadgets-worth-140005518.html

   By enabling users to care for a virtual pet, the pocket-sized devices mimicked all the responsibilities of real pet ownership, including feeding, cleaning, and playing with their pixelated companions.

8. 10 useful iPhone and Android tricks to help measure ... - AOL

   www.aol.com/news/10-useful-iphone-android-tricks...

   Your iPhone or Android has a ton of hidden goodies. Here are 10 handy tips for taking better photos, using back tap, magnifying and more. 10 useful iPhone and Android tricks to help measure ...

9. 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 ...