The 1st = 1?

2nd = 2?

3rd = 3?

The 4th = 4?

This greatly increases the variety of information available to meet different needs, even though the clarity of the image has to be greatly reduced. For example, when broadcasting a sports match where viewers need high-definition images, the TV station should use a transmission of 19.39 megabytes per second.

And in the news broadcast, the audience attention is the content of the news rather than the announcer's image, so there is no need to use so high definition, then only 3 megabytes per second speed can be, the remaining 16.39 megabytes can be used to transmit other content.

Digital television means from the studio to the launch, transmission, reception of all aspects of the use of digital television signals or all the signals of the system are transmitted through the 0, 1 digital string of digital streams composed of digital streams to disseminate the digital signal propagation rate of 19.39 megabytes per second, so the transmission of data streams to ensure that the digital television of the high-definition.

Overcoming the inherent shortcomings of analog television. Also due to the fact that digital TV allows the simultaneous existence of several standardized signals, each digital channel can be divided into several sub-channels, so that both a large data stream - 19.39 megabytes per second - can be used, but also can be divided into several sub-streams, for example, 4, each of which is at a rate of 4.85 megabytes per second.