The role of megaphone

 A megaphone is an electronic device whose main function is to reduce the diffusion of sound and amplify the input sound, so that the sound travels farther.

 The loudspeaker is mainly composed of iron, paper, magnet, and copper wire. The working principle is that the audio AC signal of the coil interacts electromagnetically with the magnet, and the surrounding air emits sound. The loudspeaker can be divided into wired loudspeaker and wireless. loudspeaker.

 Wired loudspeakers are mainly used for small meetings, outdoor tourism activities, tour guides, merchandise promotion, auctions, etc. They are divided into two categories: waist-mounted loudspeakers and handle loudspeakers. The most basic feature of a wireless loudspeaker is the wireless transmission mode of the sound signal. The sound signal is transmitted through the carrier using only air as the medium. The process of being received by the receiver is called the wireless transmission of the wireless loudspeaker.