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  2. Tone decay test - Wikipedia

    en.wikipedia.org/wiki/Tone_decay_test

    A tone at the frequency of 4000 Hz is presented for 60 seconds at an intensity of 5 decibels above the patient's absolute threshold of hearing. If the patient stops hearing the tone before 60 seconds, the intensity level is increased by another 5 decibels with the procedure repeated until the tone can be heard for the full 60 seconds or until no decibel level can be found where the tone can be ...

  3. Dynamic range - Wikipedia

    en.wikipedia.org/wiki/Dynamic_range

    Vinyl microgroove phonograph records typically yield 55-65 dB, though the first play of the higher-fidelity outer rings can achieve a dynamic range of 70 dB. [25] German magnetic tape in 1941 was reported to have had a dynamic range of 60 dB, [26] though modern-day restoration experts of such tapes note 45-50 dB as the observed dynamic range. [27]

  4. Hearing range - Wikipedia

    en.wikipedia.org/wiki/Hearing_range

    Measured with a 60 dB SPL signal, the hearing range for the Senegal bushbaby is 92 Hz–65 kHz, and 67 Hz–58 kHz for the ring-tailed lemur. Of 19 primates tested, the Japanese macaque had the widest range, 28 Hz–34.5 kHz, compared with 31 Hz–17.6 kHz for humans.

  5. 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 ...

  6. Absolute threshold of hearing - Wikipedia

    en.wikipedia.org/wiki/Absolute_threshold_of_hearing

    Auditory sensitivity changes when the duration of a sound becomes less than 1 second. The threshold intensity decreases by about 10 dB when the duration of a tone burst is increased from 20 to 200 ms. For example, suppose that the quietest sound a subject can hear is 16 dB SPL if the sound is presented at a duration of 200 ms.

  7. The great debate: Taking Social Security at age 62 vs 70 ...

    www.aol.com/finance/social-security-timing-age...

    The current figure of 76.1 years is the lowest since 1996. Compare that to the U.K., Belgium, France and the Netherlands, which boast expectancies of 80 or more — and Japan, where it’s 84.5 years.

  8. Comparison of analog and digital recording - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_analog_and...

    An LP made out of perfect vinyl would have a theoretical dynamic range of 70 dB, [6] though measurements indicate actual performance in the 60 to 70 dB range. [7] [failed verification] Compare this to digital recording. Typically, a 16-bit digital recording has a dynamic range of between 90 and 95 dB. [8]: 132

  9. This Is the Average Social Security Benefit for Age 70 - AOL

    www.aol.com/average-social-security-benefit-age...

    As of the latest data (December 2023), the average 70-year-old retired worker receives a Social Security benefit of $2,037.54 per month, or about $24,450 per year.