Maximum Viewing Pleasure Through Digital Satellite TV
The increasing popularity of digital satellite TV in the market is one clear indication that analog television sets will soon become a thing of the past. In order to understand the difference between the two, it is crucial to have a basic understanding of what an analog TV is and how it functions. This TV standard has been predominant in the US market for over fifty years now. Transmission in an analog TV starts with a video camera recording a scene at a rate of thirty frames in every second. After this, the camera converts the picture into pixels, or rows of dots that are individually designated a color and intensity. The next step in the transmission process is the integration of the pixel details and horizontal and vertical synch signals that will now be converted into a final signal, which is named as a composite video signal. However, a sound signal is separate and different from a composite video signal. The former is being transmitted as AM signal while the sound signal is being transmitted as FM signal. Analog TV generally works well with cable TV, broadcast TV, VCRs, satellite TV and camcorder. However, its limitation is mainly in its resolution. A digital satellite TV differs from an analog TV through its mode of transmission. While a traditional analog TV transmits signals through radio waves, a digital satellite TV sends information through the air. Moreover, instead of TV aerials or terrestrial antennas picking up signals, satellite dishes are used to transmit and receive broadcast information. These satellites have been launched into geosynchronous orbit to transmit clearer signals to satellite dishes on Earth. To broadcast moving picture and sound, a digital satellite TV uses digital signal as opposed to analog signals that are commonly used in analog TV. Digitally compressed transmission information, commonly referred to as digital modulation data, and is processed in a digital satellite TV.
Aside from a digital satellite TV, digital television can also be received through digital terrestrial television (DTI) and digital cable. DTI is obtained through the utilization of antenna or an aerial. Another recently developed way of receiving digital television is through IPTV, which makes use of Internet Protocol to broadcast digital programs. A significant number of people still use analog televisions and for these people to access digital television, they would have to obtain a set-top box. This special device converts digital satellite TV signals into a signal that can be processed by an analog TV. With the growing popularity of digital broadcast through digital cable, digital satellite TV, or IPTV, many countries have initiated the conversion of analog broadcast to digital broadcast. Some broadcasting stations also offer incentives to television viewers for them to switch to digital service. The switch-over process from analog broadcast to digital broadcast had already taken place in Luxembourg and The Netherlands. Switch-off is still ongoing in countries like Austria, Germany, Sweden, and Switzerland. In the United States, the Federal Communications Commission (FCC) has ordered that all broadcasts will be digital on February 17, 2009. |