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Here's what makes dogs bark at seemingly nothing at all. ... Dogs are capable of perceiving the ultrasonic vocalizations emitted by rodents. The fundamental frequency of mice is known to be around ...
In addition to lung-powered whistles, there are also electronic dog whistle devices that emit ultrasonic sound via piezoelectric emitters. [3] The electronic variety are sometimes coupled with bark -detection circuits in an effort to curb barking behaviour.
A bark is a sound most often produced by dogs. Other animals that make this noise include, but are not limited to, wolves , [ 1 ] coyotes , foxes , seals , frogs , and barking owls . "Bark" is also a verb that describes the sound of many canids .
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 devices have also been employed to keep marine mammals away from fishing nets. [2] The devices are known as acoustic harassment devices (AHDs) and acoustic deterrent devices, which are smaller AHDs [3] or intended as an awareness tool to warn species to the presence of danger rather than as a tool of harassment at a much louder level. [4]
The first modern device for air acoustic use was created in 1998, [1] and is now known by the trademark name "Audio Spotlight", a term first coined in 1983 by the Japanese researchers [2] who abandoned the technology as infeasible in the mid-1980s.
The ultrasonic devices achieve high directivity by modulating audible sound onto high frequency ultrasound. The higher frequency sound waves have a shorter wavelength and thus don't spread out as rapidly. For this reason, the resulting directivity of these devices is far higher than physically possible with any loudspeaker system.
The physical principles of acoustic waves apply to any frequency range, including ultrasound. Ultrasonic devices operate with frequencies from 20 kHz up to several gigahertz. Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine.
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