Radio broadcasting was invented by Nikola Tesla, an American-Serbian scientist, in 1893.
In 1893, Nikola Tesla first demonstrated wireless communications in St. Louis, Missouri. The basic principles of radio communications were described and demonstrated in reports given by the "Franklin Institute of Philadelphia" and the National Electric Light Association. The instrument built by Nikola Tesla contained all the basic elements of a radio system before the invention of the tube.
Nikola Tesla received a U.S. patent for radio technology in 1897. However, in 1904, the U.S. Patent Office revoked his patent and granted Marconi a patent for his radio invention. This move may have been the result of the influence of Marconi's financial backers in the United States, including Thomas Edison and Andrew Carnegie.
In radio broadcasting, people first convert sound signals into electrical signals, and then transmit these high-frequency oscillating electromagnetic wave signals to the surrounding space. In another place, people use receivers to receive these electromagnetic waves, and then restore the electrical signals to sound signals, which is the general process of wireless broadcasting.
Extended information:
Classification of radio broadcasting:
1. According to its modulation method, there are amplitude modulation broadcasting (AM) and frequency modulation broadcasting (FM);< /p>
2. According to the service scope, it is divided into local broadcasting, domestic broadcasting and international broadcasting;
3. According to the broadcasting method, it is divided into sound broadcasting and television broadcasting, and according to the broadcast frequency band used, it is divided into long wave Broadcasting, medium wave broadcasting, shortwave broadcasting and ultra shortwave broadcasting.
Baidu Encyclopedia - Radio
Baidu Encyclopedia - Radio Broadcasting