Modern wireless communication is based on generating and receiving electromagnetic (EM) waves that span a wide frequency range, from Hz to THz, providing abundant band resources and high data transfer rates.
When acting as loudspeaker/microphone alone, the graphene based acoustic devices also show ideal flat-band frequency response spanning the whole audible region as well as ultrasonic region to at least 0.5MHz such flat frequency response has significant acoustic applications implications. Using simple and low-cost fabrication methods we have produced an ultrasonic microphone and ultrasonic radio prototypes. Here we find that graphene has mechanical properties that make it ideally suited for wide-band ultrasonic transduction. Therefore, wireless ultrasonic radio is a useful communications method. Ultrasonic acoustic waves are intriguing because they do not interfere with normal voice communication and can be highly directional with long range. Introduction Humans and other animals effectively use acoustic waves to communicate with each other.
Includes 4 speakers with 100' of speaker wire for maximum coverage.Targets pest birds with an unrelenting combination of species-specific distress cries, predators, general harassments, and newest-technology ultrasonic waves (silent to humans). A unique combination of harassments creates a menacing environment that scares birds away for good. BroadBand Pro is a programmable ultrasonic and sonic bird repeller.
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