Expand knowledge:
1, etymology and definition:
(1) etymology:
It consists of the Greek word "tele-" (long distance) and the Latin word "visio" (visual).
(2) Definition:
Television is a form of broadcast media that transmits and receives video signals through electronic devices.
2. The development of television.
(1) The origin of TV:
In the early 1920s, the Scottish inventor John Logie Baird successfully demonstrated the world's first television. Subsequently, TV technology gradually improved and popularized.
(2) the era of black and white television:
In 1930s, black-and-white TV began to be commercialized and popularized in families. In this period, the TV set used mechanical scanning technology, and the picture quality was poor.
(3) The advent of color TV:
At the end of 1950s, the appearance of color TV technology made TV pictures more real and vivid. The popularity of color TV sets has brought new development opportunities to the TV industry.
3. How TV works
(1) camera:
Images are converted into electrical signals by optical sensors (such as CCD or CMOS). The camera captures and processes the light in the environment, and then converts the image information into voltage signals.
(2) sending and receiving:
Television signals are transmitted to receiving equipment by radio waves or cables. Radio waves are transmitted through antennas, modulated and demodulated.
4. The influence and application fields of TV.
(1) Entertainment and culture:
Television is an important way for people to obtain entertainment and cultural information. Television programs, including TV dramas, variety shows, news and sports events, have enriched people's lives.
(2) News and communication:
As a broadcasting medium, television has the characteristics of rapid information dissemination and plays an important role in news reporting and social communication.
(3) Education and training:
Television is also widely used in education and training. Learning TV programs, distance education and other ways make knowledge spread and popularize rapidly.
(4) Advertising and commerce:
Television advertising is an important means for enterprises to promote products and services. As a mass media, TV has a wide coverage and great influence.
5. Innovation and future development of TV technology
(1) HD and Ultra HD:
With the development of technology, high definition (HDTV) and ultra high definition (UHDTV) have become new TV standards. High-resolution, more realistic image quality, bring better visual experience to the audience.
(2) Internet and smart TV:
The combination of Internet and smart TV enables viewers to watch online videos and browse the Internet through TV. The development of smart TV has changed the way users use TV.
(3) Virtual reality and augmented reality:
The application of virtual reality (VR) and augmented reality (AR) technology provides a more immersive and interactive experience for TV. These technologies may profoundly change the form of TV entertainment.
As an important media form, television plays an important role in entertainment, culture, education, advertising and other fields. With the continuous innovation of technology, television will continue to develop and influence people's lifestyles.