How to switch the TV back to channel mode?

Press the AV/TV key on the remote control to switch to TV mode.

TV channel is a branch of physical or virtual channel in TV station or TV network. For example, in North America, Channel 2 refers to broadcast or cable TV in the frequency band of 54-60 MHz, NTSC analog video and analog audio with the carrier frequency of 59.75 MHz, or digital of 55.3 1 MHz ATSC standard. This channel can enjoy the location and service provider channels distributed by many different TV stations or cable TV.

According to the multinational band plan of a certain region, analog TV channels usually have a bandwidth of 6, 7 or 8 MHz, so the frequencies of TV channels are different. Channel numbers are also different. Digital TV channels can be multiplexed for traditional reasons, and each physical RF channel can carry out several digital sub-channels.

Television principle

Television uses electricity to instantly transmit moving visual images, similar to movies. Television uses the visual residual effect of human eyes to display a gradually changing still image frame by frame, forming a visually moving image. The transmitter of the TV system converts every tiny part of the scene into electrical signals according to the brightness and chromaticity, and then transmits them in turn. At the receiving end, the brightness and chromaticity of each tiny part are displayed according to the corresponding geometric position to reproduce the whole original image. each

China's TV signal scanning system and channel bandwidth are not exactly the same. According to international radio consultative committee CCIR's suggestion, it is distinguished by Latin letters. The sequential sampling, transmission and reproduction of TV signals from point to surface are completed by scanning. Television scanning systems vary from country to country. In China, there are 25 frames per second with 625 lines per frame. Each line is scanned from left to right, and each frame is divided into odd lines and even lines from top to bottom according to interlacing, so as to reduce flicker.