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  2. Room modes - Wikipedia

    en.wikipedia.org/wiki/Room_modes

    Room modes are the collection of resonances that exist in a room when the room is excited by an acoustic source such as a loudspeaker. Most rooms have their fundamental resonances in the 20 Hz to 200 Hz region, each frequency being related to one or more of the room's dimensions or a divisor thereof.

  3. Respiratory disturbance index - Wikipedia

    en.wikipedia.org/wiki/Respiratory_disturbance_index

    The respiratory disturbance index (RDI)—or respiratory distress Index—is a formula used in reporting polysomnography (sleep study) findings. Like the apnea-hypopnea index (AHI), it reports on respiratory distress events during sleep, but unlike the AHI, it also includes respiratory-effort related arousals (RERAs). [1]

  4. Geodesic polyhedron - Wikipedia

    en.wikipedia.org/wiki/Geodesic_polyhedron

    The primary face of the subdivision is called a principal polyhedral triangle (PPT) or the breakdown structure. Calculating a single PPT allows the entire figure to be created. The frequency of a geodesic polyhedron is defined by the sum of ν = b + c. A harmonic is a subfrequency and can be any whole divisor of ν.

  5. Doctors Say This Viral "Sleep Rule" Actually Works - AOL

    www.aol.com/doctors-viral-sleep-rule-actually...

    TikTok is filled with tips and tricks — some legitimate, many not — to help you sleep better.One of the latest encourages people to follow a 10-3-2-1-0 sleep rule, which is actually not just ...

  6. It's Time to Upgrade Your Sleep Game With a Memory Foam ... - AOL

    www.aol.com/lifestyle/time-upgrade-sleep-game...

    The best memory foam pillow for you will depend on your preferred sleep position, as memory foam pillows come in a variety of shapes and sizes, most tailored to a specific sleeping style. Here's a ...

  7. High-frequency impulse-measurement - Wikipedia

    en.wikipedia.org/wiki/High-Frequency_Impulse...

    High-frequency-impulse measurement is an algorithm for obtaining frequency information of any structure- or air-borne sound source on the basis of discrete signal transformations. This is mostly done using [Fourier series] to quantify the distribution of the energy content of a sound signal in frequency space.

  8. Where could it snow this weekend? Track winter weather ... - AOL

    www.aol.com/news/where-could-snow-weekend-track...

    Winter weather continues to ramp up this autumn with snow falling in the northern Rocky Mountains and the far northern Plains this weekend.

  9. Discrimination testing - Wikipedia

    en.wikipedia.org/wiki/Discrimination_testing

    Discrimination testing is a technique employed in sensory analysis to determine whether there is a detectable difference among two or more products. The test uses a group of assessors (panellists) with a degree of training appropriate to the complexity of the test to discriminate from one product to another through one of a variety of experimental designs.