Dolby digital is the name given to the latest and newest sound system designed by Dolby laboratories. These laboratories at first operated in England (1965), being its founder Ray Dolby, then they moved to the United States. They represent a company with extensive experience in the development of procedures and functions, seeking to improve the quality of audio storage systems, regardless of whether they are digital or analog. During the 70s, dolby innovated sound in the cinema with the implementation of the analog Dolby Stereo system, which had four channels, three of them located in the front of the theater, one on the left, one on the right for sound and effects, the third was in the center for voices. The room was located at the rear for wraparound effects.
The most frequent version of these audio systems is the A-3, this version covers a total of 6 sound channels, of which 5 have a full bandwidth of 20 Hz for classic amplifiers and a single output channel pair For low frequency channels, this format allows the use of stereo and mono.
Its activity is based on the elimination of all parts of the sound that are original and analog encoded. When carrying out this procedure, the aim is for the information to be smaller, and consequently to occupy less space. Now, once the original wave is compressed, it is possible to add new information to it.
