Dolby Digital and similar technologies

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It's been a long time since I posted something on my blog. But from now on I'll be posting stuff regularly on this blog.




   So what is Dolby Digital ?
>  Formerly known as AC-3 is a digital audio coding technique that reduces the amount of data               needed to produce high quality sound.
It has five full bandwidth channels i.e. front left , front right , center , surround left and surround right, due to which it creates full surround sound experience for the listener. This multichannel system is referred as 5.1 channel.
Because everyone doesn't have the proper equipment to utilize the 5.1 channel sound, it's developer included a downmixing feature that ensure that it is compatible with any sound device.
Now a days we can find various gadgets with dolby digital(or Atmos) feature like laptops and smartphones.

Another variant:
There is another variant of Dolby audio i.e. Dolby TrueHD . TrueHD,  while still using compression, it sis is lossless i.e. there is no loss of audio after it is decompressed and played. But it takes much more space than the previous variant so, it is only available on Blu-ray devices.

There are many other audio codecs available in the market which provide surround sound experience.
  • DTS : It shares some of the features of the Dolby digital , like lossy compression and encoding by the studio, both are decoded by the receiver and the output quality of the sound is slightly diminished. But it runs on a higher bit rate which leads to less sound degradation. Although for an average consumer the difference is negligible. We can get virtual 6.1 support for the DTS if we have a sixth channel. While the support for DTS is growing, it is still less widespread than DOLBY DIGITAL.

 There are many more surround sound codecs available, but these two are the major contributors.
Dolby Atmos is the current most used object based surround sound technology. It can process upto 
128 objects in a given scene which can be routed to upto 64 speakers.
DTS-X is the latest version of DTS. Unlike Atmos there is no limit to objects per scene. It aims to be more flexible and accessible than Atmos. It can make use of pre existing speaker layouts in the theatre and support 32 different speaker locations at home.

  • AURO-3D - It may be not as well known as the Dolby or the DTS but it has been around for a long time. It was announced in 2006 and is being used in theaters since then. Although it has stepped into the home theatre market recently. It offers similar immersion effect like the other two. While it isn't going to replace the Dolby or DTS any time soon, but it is going to hang in there in the market.


That's it in this article guys, stay tuned for more tech related stuff.
:)




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