The Benefit Of Digital Video BroadcastingThe Benefit Of Digital Video Broadcasting

Science and technology have been blessing us with many comforts in life which the people in the past could not have even thought of. However, we have been lucky enough to experience comfort in life at the maximum and that of the highest quality level. Today we have so many scientific inventions without which, our daily lives would be incomplete. These include many support systems and high tech machineries, which have made us, taste the comfort in life. Amongst many such inventions TV channels and other broadcasting services have been able to entertain us for ages now. However the difference today is that not only local channels but we can have channels from around the world, right in our living room. This was made possible due to digital video broadcasting, which enables a bundle of TV channels or also known as multiplex to be broadcasted by using a single frequency of a radio spectrum.

There are basically two standards used to compress audio and video data for digital video broadcasting. One is MPEG-2 which efficiently compresses various TV channels and services into a bundle. However, now MPEG-2 is superseded by MPEG-4. Its compressing standards for audio AAC and video AVC, work a lot more efficiently that MPEG-2. The comparative analysis of these two standards makes it evident, that MPEG-4 requires as less as half a bit rate than that of MPEG-2 to produce a high quality result. These standards are more defined as protocols, which highlights the fact it can be easily predicted, that there is going be further progress in terms of technology and performance by MPEG-4.

There are various statistical multiplexing methods which can be used to improve the picture quality of the transmission. Normally, each channel is given with a constant bandwidth within which it has to operate, this is known as constant bit rate encoding. But this encoding has been displaying an inefficient performance because it makes the picture quality suffer, at demanding times. Generally, the transmission does not use the entire bandwidth allocated to a particular channel because of huge redundancy in video data.

In order to provide best quality output, another statistical multiplexing tool is employed, which is known as variable bit rate encoding. This tool does allocate a particular bandwidth capacity for a service or channel to operate in but, at times of high demand, the encoding capacity varies so that the service can transmit high quality output. This joint rate control on encoding has two approaches, look ahead and feedback.

Variable bit rate encoding along with MPEG-4 can work wonders to provide the best quality output in digital video broadcasting. It is due to these statistical multiplexing tools, that we are able to transmit various channels from anywhere in the world, without deteriorating the picture quality. Besides this, with the increase in sophistication of technology like HDTV series and DVB multiplexing, it is the need of the hour to improve upon various multiplexing tools, so that we keep reaping the benefits of digital video broadcasting.
by Jack Wylde
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The author is an experienced writer for consumer electronic product reviews and shares the Autoboxen site. Where you can find out more about consumer electronics like Mercedes Lautsprecher and Auto and what it can do for you.
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