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An electric megaphone is a handheld public address system, an electronic device that amplifies the human voice like an acoustic megaphone, using electric power. It consists of a microphone to convert soundwaves into an electrical audio signal , an amplifier powered by a battery to increase the power of the audio signal, and a loudspeaker to ...
A late 19th-century speaking trumpet used by firefighters A small sports megaphone for cheering at sporting events, next to a 3 in (8 cm) cigarette lighter for scale. From the Ancient Greek era to the nineteenth century, before the invention of electric loudspeakers and amplifiers, megaphone cones were used by people speaking to a large audience, to make their voice project more to a large ...
An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.
Grab a fresh coffee, perhaps a leftover slice of pumpkin pie, and start knocking out your holiday gift list while so many goodies are still on sale. Take a look at the best Cyber Monday deals we ...
I caught up with Lundmark last week after Nokia announced two major deals: the $375 million sale of its undersea internet cable unit, and its $2.3 billion acquisition of Infinera, which will boost ...
A Washington state man who used a megaphone to orchestrate a mob’s attack on police officers guarding the U.S. Capitol was sentenced on Wednesday to more than seven years in prison. U.S ...
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