Digital Video Broadcasting And Its Supporting Tools!
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 However, now MPEG-2 is superseded by MPEG-4.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.
You can also increase the bandwidth of the frequency so as to have a better picture quality of the data. This can be achieved by using statistical multiplexing tools. Usually for any channel, there is a specific bandwidth allocated to it, which is known as constant bit rate encoding. However, it has been quite inefficient in its performance, because it does not provide quality service at crucial times of high load. Thus, the output suffers. Generally, video scenes have a lot of redundancy in their data; hence they require lesser bandwidth capacity to get transferred. This is the reason which is why the entire allocated bandwidth is not used.
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.
It is vital to mention that variable bit rate encoding, when employed with compression standards like MPEG-4, can produce mind-blowing quality of both the sound and video output. It is due to these statistical tools that we are able to get different channels, without making the picture quality suffer. Moreover, with the advent of newer technologies like HDTV series and DVB multiplex, we are in a need to increase the multiplexing capacity of various tools.
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