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In other words, the signal has equal power in any band of a given bandwidth (power spectral density) when the bandwidth is measured in Hz. For example, with a white noise audio signal, the range of frequencies between 40 Hz and 60 Hz contains the same amount of sound power as the range between 400 Hz and 420 Hz, since both intervals are 20 Hz ...
Active student response (ASR) techniques are strategies to elicit observable responses from students in a classroom. They are grounded in the field of behavioralism and operate by increasing opportunities reinforcement during class time, typically in the form of instructor praise. [1]
There are many different mechanisms of masking, one being suppression. This is when there is a reduction of a response to a signal due to the presence of another. This happens because the original neural activity caused by the first signal is reduced by the neural activity of the other sound. [7] Combination tones are products of a signal and a ...
The same gesture, referred to as Silent fox signal or similar terms, whispering fox, listening fox, or the quiet coyote, is a hand signal used in parts of Europe and North America, and is mostly done in schools by teachers to calm down a loud classroom. [8]
A certain amount of energy is needed within a time frame to reach the threshold. This can be done by using a higher intensity for less time or by using a lower intensity for more time. Sensitivity to sound improves as the signal duration increases up to about 200 to 300 ms, after that the threshold remains constant. [2]
Two shady elementary school teachers were booted from their Texas classroom after allegedly slapping special stickers containing melatonin on their students to keep them quiet.
In general, the interior of an anechoic chamber can be very quiet, with typical noise levels in the 10–20 dBA range. In 2005, the best anechoic chamber measured at −9.4 dBA. [ 2 ] In 2015, an anechoic chamber on the campus of Microsoft broke the world record with a measurement of −20.6 dBA. [ 3 ]
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