surround sound seminar ppt
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abstract
There are many siege systems available in the market. They use different techniques to create effects around. Some surround sound is based on giving a multi-channel soundtrack to audio compression technology (for example, Dolby Prologic® or Digital AC-3®), and audio decompression technology, so that the sound is around 5-speaker The sound can be decoded on the set up.

In addition, virtual surround sound systems use 3D audio technology to create illusions of five speakers arising from a regular set of stereo speakers, so the five speaker enables the surround sound listening without the need for setup

Now we are entering the third generation of reproduced sound. The monophonic era was the first age, which was followed by the invention of the Addison of Fongograph in 1877 until the 1950s. During those times, the goal was only to reproduce the original sound rhythm. No efforts were made to regenerate directional qualities or spatial realism.

Stereo era was the second age. It was based on inventions from the 1930s, reached people in the mid-50s, and gave great golden joy for four decades. Stereo improved the projection and added two dimensions of space: the spread of left-right artists on a stage and a set of acoustic signals that allow listeners to experience the front and rear dimensions.

In two-channel stereo, this realism is based on delicate sound signals. In the most common two-speaker stereo system, these microscopic signals can be easily lost, which gives sound to the playback flattening and without heat. The system around multichannel, on the other hand, can provide this presence in a manner that is strong, reliable and consistent.

The purpose of this seminar is to find out the progress of sound and technologies around the consumer market. Human hearing is binaural (based on two ears), yet we have the ability to apply the sound locally. That is, we can determine where the sound is coming from, and in most cases, how far. In addition, humans can separate many sound sources in relation to the surrounding environment. This is possible because our brains can process the information obtained by our two ears and determine the location of each voice in a three-dimensional environment.

Main localization signals used in binaural human hearing in the InterUlal Intensity Inter (IID) and Interval time difference (ITD). IID refers to the fact that if the sound is close to one ear, the intensity of that ear is more than the other ear, which is not only forward but also receives the shadow from the head of the listener. Itd is related to the fact that until the sound is not located at exactly the same distance from the ear (i.e. directly or back to the listener), it comes in an ear sooner than the other ear. If the sound reaches the right ear first, then the source is right somewhere, and vice versa.

By combining these two signals and other related to the reflection of sound, when they travel to our kidnapping, our brains are able to determine the position of a different sound source.

The main format of the digital discrete surround is "5.1 channel" system. 5.1 full full bandwidth audio (20 Hz to 20 kHz) plus five channels of the sixth channel (see figure 1 below) (front: left, right and middle and back: surrounded and surrounded right) Sometimes explosions like There is additional bass information to maximize the effect of the scenes.
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