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Fitbit Ultra activity tracker in teal clipped to pocket. The Fitbit Ultra was announced on October 3, 2011. [18] The new features included: an altimeter that measures elevation gain in terms of floors, with one floor roughly equivalent to ten feet; a digital clock visible on the device's display; a stopwatch that can be used to time activities
a real time clock or timer to start/stop the actigraph recording at specific times, and to record accumulate values for a specific time frame, a non-volatile memory to store the resulting values, an optional low-pass filter which filters out everything except the 2–3 Hz band, thereby ensuring external vibrations are ignored, and
The Fitbit Charge 3, a wristband health and fitness tracker introduced in October 2018, was the first device to feature an oxygen saturation (SPO2) sensor; however, as of January 2019, it was non-functional and Fitbit did not provide an implementation timeline. [44] The Fitbit Charge 3 comes with two different-sized bands: small and large.
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SMPTE timecode signal (A logic value 1 is expressed by a transition at the midpoint of a period. A logic value 0 is expressed by the absence of such a transition.) compared to the outwardly-similar Manchester code (A logic value 0 is expressed by a high-to-low transition, a logic value 1 by low-to-high transition at the midpoint of a period).
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1 ms: The time for a neuron in the human brain to fire one impulse and return to rest [13] 4–8 ms: The typical seek time for a computer hard disk: 10 −2: centisecond cs One hundredth of one second 1.6667 cs: The period of a frame at a frame rate of 60 Hz. 2 cs: The cycle time for European 50 Hz AC electricity
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