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2. Equal-loudness contour - Wikipedia

   en.wikipedia.org/wiki/Equal-loudness_contour

   An equal-loudness contour is a measure of sound pressure level, over the frequency spectrum, for which a listener perceives a constant loudness when presented with pure steady tones. [1] The unit of measurement for loudness levels is the phon and is arrived at by reference to equal-loudness contours. By definition, two sine waves of differing ...

3. Blood pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Blood_pressure_measurement

   Digital blood pressure monitor in use. Arterial blood pressure is most commonly measured via a sphygmomanometer, which historically used the height of a column of mercury to reflect the circulating pressure. [1] Blood pressure values are generally reported in millimetres of mercury (mmHg), though modern aneroid and electronic devices do not ...

4. Head-related transfer function - Wikipedia

   en.wikipedia.org/wiki/Head-related_transfer_function

   HRTF filtering effect. A head-related transfer function (HRTF) is a response that characterizes how an ear receives a sound from a point in space. As sound strikes the listener, the size and shape of the head, ears, ear canal, density of the head, size and shape of nasal and oral cavities, all transform the sound and affect how it is perceived, boosting some frequencies and attenuating others.

5. Take 20% Off Raycon Earbuds, Headphones and Speakers ... - AOL

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   These Basic Earbuds. The Work Earbuds Classic. Raycon. For everyday wear that’s easy to take in and out, these buds are the perfect pick! See it! Get The Work Earbuds Classic (originally $120 ...

6. Study Finds Why Your Seated Blood Pressure Reading May ... - AOL

   www.aol.com/study-finds-why-seated-blood...

   Korin Miller. September 16, 2023 at 5:30 AM. A new study finds the traditional way of taking blood pressure may not give accurate results. Researchers discovered that some people only had high ...

7. What is a normal blood pressure reading? - AOL

   www.aol.com/lifestyle/normal-blood-pressure...

   Regarding ideal numbers, the famous M.D. says: "Your blood pressure is supposed to be under 140 over 90, optimally closer to 120 over 80." He went on to call the test "life-saving" and "the single ...

8. Absolute threshold of hearing - Wikipedia

   en.wikipedia.org/wiki/Absolute_threshold_of_hearing

   Absolute threshold of hearing. The absolute threshold of hearing ( ATH ), also known as the absolute hearing threshold or auditory threshold, is the minimum sound level of a pure tone that an average human ear with normal hearing can hear with no other sound present. The absolute threshold relates to the sound that can just be heard by the ...

9. The best wireless earbuds - AOL

   www.aol.com/news/best-wireless-earbuds-203936333...

   Sony WF-1000XM4 $ at Amazon. Sony WF-1000XM4 $ at Best Buy. Sony WF-1000XM4 $ at Sony. Best for fitness: Beats Fit Pro Pros: Great fit, easy button controls. Cons: Case could be improved. The ...