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The Children's Internet Protection Act (CIPA) requires that U.S. schools have appropriate measures in place to protect students from obscene or harmful online content in order to be eligible for discounts on internet access or internal connections through the Schools and Libraries Program of the Universal Service Fund, commonly known as the E-Rate program. [2]
To avoid this type of jamming, bats typically wait enough time for echoes to return from all possible targets before making the next sound. This can be seen clearly when a bat attacks an insect. The bat produces sounds with progressively shorter time intervals, but always allowing enough time for sounds to travel to the target and back. [6]
Indeed, ultrasonic signals can convey location information via a location identifier, often placed in stores or businesses. [3] Lastly, this new ultrasonic tracking poses a threat to users of Bitcoin and Tor because it de-anonymizes a user's information, since ultrasonic signals associate the user's mobile phone with the Bitcoin or Tor account. [3]
Content-limited (or filtered) ISPs are Internet service providers that offer access to only a set portion of Internet content on an opt-in or a mandatory basis. Anyone who subscribes to this type of service is subject to restrictions. The type of filters can be used to implement government, [13] regulatory [14] or parental control over subscribers.
The ultrasonic detector operates by the transmitter emitting an ultrasonic signal into the area to be protected. Solid objects (such as the surrounding floor, walls, and ceiling) reflect sound waves, which the receiver will detect.
Electronic pest control is the name given to any of several types of electrically powered devices designed to repel or eliminate pests, usually rodents or insects. Since these devices are not regulated under the Federal Insecticide, Fungicide, and Rodenticide Act in the United States, the EPA does not require the same kind of efficacy testing that it does for chemical pesticides.
The ultrasonic hearing is coupled to a motor response that causes evasion of the bat during flight. Although ultrasonic signals are used for echolocation by toothed whales, no known examples of ultrasonic avoidance in their prey have been found to date. [2] Ultrasonic hearing has evolved multiple times in insects: a total of 19 times.
Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver. This happens when the modulated ultrasound passes through a nonlinear medium which acts, intentionally or unintentionally, as a demodulator .
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