Mini Megaphone
Sound Is Really Vibration of Air
Sound is no more than vibrations of air that can be decoded by the human auditory system. When an individual speaks, air flows from the lungs, across the vocal chords, and out through the mouth; movements of the tongue and lips help articulate specific sounds. As the air passes over the vocal chords and the tongue, the vibrations of these body parts generate the individual's voice. The vibrations travel through the air until they are received by another person or a group of people. When the vibrations arrive at the listener, they cause the sensitive membrane of the listener's ear to vibrate. Sensitive nerves within the ear carry these vibrations to the brain where they are decoded into sound.
Sounds Tend to Disperse
When an individual speaks, or even yells, the air vibrations exiting the mouth scatter in a broad range of directions. Under normal circumstances, this scattering of air vibration is helpful because it allows listeners to hear the speaker no matter where they are in proximity to the individual's mouth. In noisy environments or over great distances, though, the scattering of sound causes the speaker's voice to rapidly dissipate; likewise, the concentration of people in crowded venues allows the air vibrations to be absorbed by bodies, clothing, and personal effects like handbags. For this reason, a speaker on one side of a crowded auditorium is unlikely to be heard very well by someone on the other side, as the vibrations of the speaker's voice are both scattered and quickly absorbed by other individuals closer to the source of the sound.
Mini Megaphone Concentrates Sound
When a speaker speaks into a mini megaphone, however, the conical shape of the device captures the air vibrations and prevents them from scattering. As the vibrations travel through the mini megaphone, they are protected from interference by other sound sources (such as other people talking or yelling). The sounds exit the mini megaphone as a tightly packed, concentrated collection of air vibrations that are able to be travel greater distances without being dispersed or absorbed by nearby items. While a listener who is standing or sitting beside someone using a mini megaphone may not hear the speaker as clearly as if he were not using the device, someone in the path of the megaphone's projection, that is, someone who receives the concentrated collection of air vibrations, interprets the sound as much louder than if the mini megaphone were not used.
Mini megaphones, sometimes also known as bull horns, are portable devices that allow for more effective voice projection. These battery-powered megaphones enhance the loudness of one’s voice without having to give considerable effort to produce a loud sound. Mini megaphones work by detecting the sound waves in the speaker’s voice at the receiving end and then converting them into electric signals. An amplifier at the sending end of the megaphone amplifies the sound and then dissipates it into the surrounding.
Mini megaphones can be used for a number of activities and not just for sporting events as contrary to popular belief. Mini megaphones can be used by firemen to warn people or call on for escape. They can also be used by dog trainers to effectively command dogs to perform actions at a distance. These can be used in schools to line children up for physical exercises or for disciplinary or to issue formation commands during events or schooldays during general assembly. Megaphones can also be used to address a large swarm of public in auditoriums, fairs or other public events. Many megaphones available today offer a number of features. Some megaphones can reach distances up to a 100 feet, while other megaphones come with volume control functions. Many high-tech mini megaphones contain siren buttons as well to alarm people under emergency conditions. Most contain a wrist or carry strap so that the user does not lose it.
