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  2. Decibel - Wikipedia

    en.wikipedia.org/wiki/Decibel

    The decibel originates from methods used to quantify signal loss in telegraph and telephone circuits. Until the mid-1920s, the unit for loss was miles of standard cable (MSC). 1 MSC corresponded to the loss of power over one mile (approximately 1.6 km) of standard telephone cable at a frequency of 5000 radians per second (795.8 Hz), and matched closely the smallest attenuation detectable to a ...

  3. Weighting filter - Wikipedia

    en.wikipedia.org/wiki/Weighting_filter

    A-weighting is only really valid for relatively quiet sounds and for pure tones as it is based on the 40-phon Fletcher–Munson equal-loudness contour. [3] The B and C curves were intended for louder sounds (though they are less used) while the D curve is used in assessing loud aircraft noise ( IEC 537 ).

  4. A-weighting - Wikipedia

    en.wikipedia.org/wiki/A-weighting

    A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level. [1]

  5. Sound level meter - Wikipedia

    en.wikipedia.org/wiki/Sound_level_meter

    For compliance purposes, readings with an ANSI Type 2 sound level meter and dosimeter are considered to have an accuracy of ±2 dBA, while a Type 1 instrument has an accuracy of ±1 dBA. A Type 2 meter is the minimum requirement by OSHA for noise measurements and is usually sufficient for general-purpose noise surveys.

  6. Signal-to-noise ratio - Wikipedia

    en.wikipedia.org/wiki/Signal-to-noise_ratio

    SNR is defined as the ratio of signal power to noise power, often expressed in decibels. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise. A ratio higher than 1:1 (greater than 0 dB) indicates more signal than noise.

  7. In Texas, can I sue a noisy neighbor? Here’s what state law ...

    www.aol.com/texas-sue-noisy-neighbor-state...

    Loud noises can cause hearing loss, increased depression and anxiety, and disturbance in one’s focus. Noise above 70 decibels for a long period of time can cause hearing damage.

  8. Do Loop earplugs actually work?

    www.aol.com/news/loop-earplugs-actually...

    Quiet ($25): Up to 26 decibels SNR of noise reduction ... Experience ($35): Up to 18 decibels SNR of noise reduction and designed to reduce noise from loud events, like music festivals and concerts.

  9. Dynamic range - Wikipedia

    en.wikipedia.org/wiki/Dynamic_range

    The instantaneous dynamic range of human audio perception is similarly subject to masking so that, for example, a whisper cannot be heard in loud surroundings. A human is capable of hearing (and usefully discerning) anything from a quiet murmur in a soundproofed room to the loudest heavy metal concert.