Football is undoubtedly the King of all sports with billions of fans worldwide. It brings people from all around the world together, regardless of nation, ethnicity, color, or religion.
Nevertheless, surely not everyone can afford or have the time to buy a ticket and watch a football match in person. This is when the Live-broadcast technology does its job. We can enjoy a match as it is taking place in a different country with friends in our home with just only a television or an Internet network connection device. It is simple, just search with the keyword live football or truc tiep bong da, and you can access a website and watch live football completely free.
Let’s have a look at how the technology functions.
For example, even if they had Local Television stations in Russia, broadcasting to Nigeria without the use of satellite would still be out of the question. Therefore, they pull this off by picking the events or programs through the satellites and then rebroadcast them locally to Nigeria.
However, picking events through satellites is very costly for local stations. Thus, they usually collaborate with other stations to broadcast the events at a lower price.
The television’s invention is a truly remarkable achievement. Thanks to it, we can have a visual depiction of past events, and it can also transmit information to the rest of the globe at light speed.
Imagine how boring it is to watch a match after days and the result has already been released. The only people that can experience the thrill and excitement are those who paid to watch the match as it happened.
The live-broadcast technology, which is essentially a bundle along with television technology, is one example.
The Television System
Television’s concept simply is “radio with images”; similarly to how a regular radio transmits sounds, fast-changing picture bit rates are likewise delivered over similar radio waves.
For your information, radio waves can be identified as electromagnetic waves that move at the speed of light and have the longest wavelengths (1mm – 100km), and the lowest frequencies (from 3kHz to 300GHz).
The 3 stages comprise the television system:
- The television camera
- The television transmitter
- The television receivers
You can watch those sports events from your house because people are getting the video feed for all the details of those events. Essentially, videos are fast-moving images that form a video impression in your mind.
How do television cameras work?
A camera is made up of a lens that gathers light rays from a body that it is focused on. Lens’ material can be glass or plastic (its refractive index has to be such that rays of light travel slower than they would in the air).
Then it focuses on a surface, where the light ray casts the object’s shadow, which is called a “film” or photographic paper. These are made of materials that are sensitive to light, such as silver.
Television cameras work similarly to digital cameras. The pictures reflected are then sent into an image sensor chip. The chip breaks the pictures into pixels and then stores them in electronic format, which allows them to be transferred.
As mentioned before, videos are a quicker stream of moving images; a video may show up to 24 separate images in a second, making motion capture possible.
How do television transmitters work?
After generating the electronic signal to our TV camera on the football field, it is ready to broadcast across great distances to the rest of the globe.
Satellite vs Technology
The programming source
It begins with TV channels from broadcasting companies such as CNN, SS3, Disney Junior, and so on. Of course, they will need access to television cameras to broadcast live events.
The signals will then be transmitted from the programming source through wireless systems or cables to the broadcast centers.
The broadcast centers
They are companies that receive signals from the programming source. 2 major operations take place here.
- Compression: Signals will be compressed down to roughly 60%. Then a multiplexer will be used to aggregate many signal inputs from various sources and produce a single/fewer output, which is the compressed output.
- Protection by encryption: Since your paid membership grants you access to these services, the service must be protected from non-subscribers.
Once those 2 operations have finished, this is when the signals are transmitted to the geo-stationery satellites.
Geo-stationery satellites are ones permanently positioned in place (up to 38500km from sea level). There are many transponders in the satellites.
Their job is to receive the transmitted signals and rebroadcast them. The frequency of these signals is now very high, in fact, they are now microwaves.
Satellite dishes receive retransmitted signals from the transponders. As mentioned above, the wavelength from the transponders is very low (between 1 to 10cm), so it cannot go through your house’s walls. This is why satellite dishes have to be placed outside your house.
Satellite dishes feature a parabolic surface that collects high-frequency microwaves. The higher the dishes, the stronger the signals. The dishes’ rays deflect the microwaves into a set feed horn at the parabolic dishes’ focal point, similar to a concave mirror.
The feed horn has a converter that filters out noises (signals without any information) and amplifies the signal, then transforms them into a low frequency that the decoder can understand. After this, the signals are sent into the decoder through an LNB cable that is coaxial in form.
The decoders get the low frequency as well as the amplified signals from the satellite dishes through LNB cables. They reverse everything to signals from broadcast centers, that is decompression and decryption (only active subscribers are granted this permission of course).
Also, the signals are processed and divided into different channels, since numerous sources are supplied to the broadcast centers.
It sounds a bit confusing. But if you are not a streamer, or simply want to visit a streaming site such Bachtuoc.tv as to watch live football. Then the above parameters are quite picky for you.
Thanks to geostationary satellites, it is much simpler for electromagnetic waves to move freely in space using satellite broadcast technology. As a result, satellite broadcast technology (or live-broadcast technology) can provide high-definition signals.
However, executing such projects is highly expensive, which is why most satellite television companies or centers demand memberships to access.