DTH with MPEG-4 and DVB-S2

Digital Video Broadcasting – Satellite – Second Generation (DVB-S2):

DVB-S2 Satellite modulation is an enhanced specification of DVB-S standard for digital satellite transmission system. This adoption is for the growing demand of HDTV, and would enable commercial launch of HDTV services. There are other areas also which may benefit from it like satellite broadband, HITS platforms, professional applications for data transparency, etc. DVB-S2 (EN 302307) was ratified by ETSI (European Telecommunications Standards Institute) in 2005.

Moving Picture Experts Group-4 Advance Video Coding:

MPEG-4 AVC (H.264) is a standard for video compression.

MPEG-4 is a patented collection of methods defining compression of audio and visual (AV) digital data. It has many “parts”, each part standardizes various entities related to multimedia, like audio, video and the file format.

H.264/AVC is the latest block-oriented motion-compensation-based codec standard. H.264 is most popular for its use on Blu-ray Disc, HD DVD and videos from iTunes Store.

More information on: www.etsi.org

www.dvb.org

www.­videocond2h.­com

LED TVs

LED TV or LED backlit LCD television uses LED backlighting instead of the standard cold cathode fluorescent lamps (CCFL) used in most LCD televisions.

The main difference between conventional LCD and LED LCD is in backlighting techniques. It is because of this, the picture qualities change along with other characteristics.

According to the colour, the LEDs can be divided into two methods, White LED backlight and RGB LED backlight.

When White LED backlight used, it is called Edge-LED lighting. The principal benefit of Edge LED television is the ability to build thinner LED LCDs as thin as 9.9 mm.

When RGB LED backlight is used, it has an advantage of displaying realistic colours.

Advantages:

1. It possesses wide colour range and Exceeds NTSC color gamut, especially when RGB-LED backlighting is used. [NTSC: Technical standardization of analog television system was set up by National Television System Committee (NTSC). It is/was in used in most of the United States, Japan, South Korea, Tiwan while in Europe and rest of the world, it is PAL and SECAM]
2. Excellent life expectancy as manufacturers claim. They say its life is about 100,000 hours which is double the life expectancy of CCFL LCD TV.
3. Replaces colour wheel on DLP TVs.

They can produce a very bright image with greater contrast and deeper blacks compared with LCD TVs. Actually, LED TV can better handle darker tones. Sometimes as dark as 100%.

They consume much less power. About 40% less compared with LCD TV of a similar size.

Quality of fast moving video playback depends on response time and refresh rate. LED LCDs have higher refresh frequency and response time. In fact, look for these while making purchase. Actually, Refresh Rate and Response Time are properties of LCD Panel and nothing to do with the backlighting.

The main benefit of Edge LED lighting system is the ability to build slimmer LED TVs as thin as 9.9 mm.

The light source is also environmentally friendly because it uses no Mercury.

Disadvantage:

1. At present, they are expensive.