When the changing current flows into the stereo, the magnet becomes an electromagnet. The direction of the current is constantly changing, and the electromagnet moves back and forth because of "the electrified wire is forced to move in the magnetic field", which drives the paper basin to vibrate back and forth. Stereo will ring.
Voice is a simplified everyday language, which is the abbreviation of phonology. Immediate generation refers to a set of equipment that can restore and play audio signals.
With the progress of society, people yearn for a more colorful life. Song and dance, as a form of entertainment spread for thousands of years, has penetrated into the lives of people of all ethnic groups. However, with the development of science and technology, people have higher and higher requirements for the performance form and venue of song and dance. The sound system is constantly improved and perfected with people's needs. Large enough to meet the needs of tens of thousands of people at the concert site, small enough to meet the needs of individual family playing musical instruments and karaoke.