Image quality standards are constantly being improved. The picture on the monitor screens is getting better, the resolution is getting bigger, and the color and contrast are higher. The quality improves not only on television devices, but also on the screens of smartphones, video cameras and other devices. It’s already customary for a modern user that there have long been broadcasting standards that provide high quality TV viewing, namely in HD.
What is HDTV?
The content of the article
- What is HDTV?
- What is the difference between HDTV and other television standards
- What you need to watch HDTV
HDTV is a new broadcast format for television. It differs from others in increased image clarity. Unlike legacy formats, such as NTSC, PAL or SECAM, information is transmitted through digital encoding, which allows for image quality up to 1080p — this is not possible with analog broadcasting, which provides an image in 480p. Also, the image obtained by the analogue method is often distorted and blurred. This is due to the features of signal demodulation.
What is the difference between HDTV and other television standards
The main difference between HDTV and other formats is high resolution, better color rendering and less susceptibility to noise and distortion. This is achieved, as was said by digital coding of the signal. The image is divided into segments, and each segment is encrypted in a specific sequence of digital code. Then the encoded signal is compressed on the frequency spectrum, which allows the device to process much more information, and is sent to the decoder via cable or via ether.
On the TV receiver, the digital sequence is restored to the original image and a high-quality picture is displayed on the screen. Also, the code sequence has greater noise immunity, since it is possible to restore neighboring information according to the algorithms obtained earlier.
It is important for the user that the HDTV format provides an image with a resolution of up to 1920x1080 pixels, while analog transmission allows for the transmission of images only 720x480 pixels. Also, analog broadcasting is extremely susceptible to interference and distortion, especially if it is broadcast through the air. It can be affected by both weather and neighboring emitting stations, which interfere with the normal reception of the signal.
Also, due to its proportions, devices supporting HDTV are much more convenient for viewing, since they are closest to human perception.
Two formats that are often confused should be distinguished. These are HD Ready and Full HD. Although, according to the principle of operation, they are similar, devices with this prefix in the name differ in image quality. HD Ready delivers up to 720p on a TV screen. Even if the received signal is better in quality, for example, 1080p, this technology will artificially reduce its quality, since it has less bandwidth. At the same time, Full HD provides image quality up to 1080p, which is one of the highest for television today.
REFERENCE! HD stands for High Definition, which means “high definition” in English. This abbreviation means that the image obtained during the scan will have a quality of at least 720p. The term HD refers not only to the television format, but to the image as a whole. This format is characterized by high image quality, which favorably affects the viewing of the video.
What you need to watch HDTV
To watch television in HD quality, first of all, you need a signal source. The source can be a satellite dish, receiver or cable, as well as a game console, TV adapter or DVD player.
ATTENTION! Not all devices support HD format. In order to make sure that the selected TV receiver can provide transmission and reception of HD-images on the screen, you should read the technical literature that is included with it.
If a user connects to an HDTV via a provider cable or satellite dish receiver, it is necessary to check with the operator whether the set of HD channels is included in the package. Many providers require the purchase of additional services to play channels in high quality.
REFERENCE! You should be aware that in addition to HDTV, devices that support UHDTV technology have already appeared on the market. This is an ultra-high-definition technology that provides image quality up to 2160p and a resolution of 3840x2160.
There are also demonstration prototypes that are capable of transmitting images up to 4320r. This format is called UHDTV 8k.
