bullhorn - ορισμός. Τι είναι το bullhorn
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Τι (ποιος) είναι bullhorn - ορισμός

HANDHELD DEVICE THAT AMPLIFIES THE VOICE OF A SPEAKING PERSON, CAN BE AN ACOUSTIC MEGAPHONE OR ELECTRONIC MEGAPHONE
Bullhorn; Loudhailer; Speaking trumpet; Loud hailer; Bull horn; Loud-hailer; 📣; 🕫; 🕬; Audio hailer; Bull-horn; Mega-phone; Blow-horn
  • A man using an electric megaphone
  • Page from the [[Codex canadensis]], by [[Louis Nicolas]], circa 1675 to 1682, showing a native North-American chief using a megaphone made of bark
  • Silent film director [[D. W. Griffith]] using megaphone in 1922
  • Drawing by [[Athanasius Kircher]], 1684, shows man ''(left)'' using megaphone to communicate over distance
  • A small sports megaphone for cheering at sporting events, next to a 3 in. cigarette lighter for scale
  • A late 19th-century speaking trumpet used by [[firefighter]]s

bullhorn         
(bullhorns)
A bullhorn is a device for making your voice sound louder in the open air. (AM; in BRIT, use loudhailer
, megaphone
)
N-COUNT
bullhorn         
¦ noun N. Amer. a megaphone.
Megaphone         
·noun A device to magnify sound, or direct it in a given direction in a greater volume, as a very large funnel used as an ear trumpet or as a speaking trumpet.

Βικιπαίδεια

Megaphone

A megaphone, speaking-trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction. The sound is introduced into the narrow end of the megaphone, by holding it up to the face and speaking into it, and the sound waves radiate out the wide end. A megaphone increases the volume of sound by increasing the acoustic impedance seen by the vocal cords, matching the impedance of the vocal cords to the air, so that more sound power is radiated. It also serves to direct the sound waves in the direction the horn is pointing. It somewhat distorts the sound of the voice because the frequency response of the megaphone is greater at higher sound frequencies.

Since the 1960s the voice-powered acoustic megaphone described above has been replaced by the electric megaphone, which uses a microphone, an electrically-powered amplifier and a folded horn loudspeaker to amplify the voice.

Παραδείγματα από το σώμα κειμένου για bullhorn
1. Morroy on bullhorn and a somewhat reluctant–looking candidate.
2. One called out with a bullhorn: "Hey, hey, my friend.
3. The president still couldn‘t find his bullhorn moment.
4. We will not be violent,? another roared into a bullhorn.
5. Witnesses said police screamed a name through a bullhorn, then banged on the door.