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2. Actigraphy - Wikipedia

   en.wikipedia.org/wiki/Actigraphy

   Devices used for actigraphy collect data generated by movements. In order to make the data usable for practice and sleep medicine, movements are translated into digital data by actigraphs. Several devices and computer software are available, and assessment can vary depending on combination of chosen device, procedure and software program. [18]

3. Sleep tracking - Wikipedia

   en.wikipedia.org/wiki/Sleep_tracking

   People can track their sleep through smartphones with consumer sleep-tracking apps, wearable devices, or a combination or both consumer sleep-tracking apps and wearable devices. Consumer sleep-tracking devices such as smartphones and activity trackers were developed primarily for the use of consumers, not for clinical use or research. [12]

4. 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]

5. White noise machine - Wikipedia

   en.wikipedia.org/wiki/White_noise_machine

   White noise devices are available from numerous manufacturers in many forms, for a variety of different uses, including audio testing, sound masking, sleep-aid, and power-napping. Sleep-aid and nap machine products may also produce other soothing sounds, such as music, rain, wind, highway traffic and ocean waves mixed with—or modulated by ...

6. 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.

7. Audio analyzer - Wikipedia

   en.wikipedia.org/wiki/Audio_Analyzer

   An audio analyzer is a test and measurement instrument used to objectively quantify the audio performance of electronic and electro-acoustical devices. Audio quality metrics cover a wide variety of parameters, including level, gain, noise, harmonic and intermodulation distortion, frequency response, relative phase of signals, interchannel crosstalk, and more.