14 Facts About Surround sound

Surround sound is a technique for enriching the fidelity and depth of sound reproduction by using multiple audio channels from speakers that surround the listener .

Surround sound adds one or more channels from loudspeakers to the side or behind the listener that are able to create the sensation of sound coming from any horizontal direction around the listener.

Surround sound typically has a listener location where the audio effects work best and presents a fixed or forward perspective of the sound field to the listener at this location.

Surround sound formats vary in reproduction and recording methods, along with the number and positioning of additional channels.

Significant work has been done using surround sound for enhanced situation awareness in military and public safety application.

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Commercial surround sound media include videocassettes, DVDs, and SDTV broadcasts encoded as compressed Dolby Digital and DTS, and lossless audio such as DTS HD Master Audio and Dolby TrueHD on HDTV Blu-ray Disc and HD DVD, which are identical to the studio master.

Some AV receivers, stereophonic systems, and computer sound cards contain integral digital signal processors or digital audio processors to simulate surround sound from a stereophonic source .

The Surround sound was diffused throughout the cinema, controlled by an engineer using some 54 loudspeakers.

The surround sound was achieved using the sum and the difference of the phase of the sound.

Finally, surround sound can be achieved by mastering level, from stereophonic sources as with Penteo, which uses digital signal processing analysis of a stereo recording to parse out individual sounds to component panorama positions, then positions them, accordingly, into a five-channel field.

Surround sound recording techniques can be differentiated into those that use single arrays of microphones placed in close proximity, and those treating front and rear channels with separate arrays.

Surround sound techniques are largely based on 3-channel techniques with additional microphones used for the surround channels.

Binaural recording is a method of recording Surround sound that uses two microphones, arranged with the intent to create the 3-D stereo experience of being present in the room with the performers or instruments.

The idea of a three dimensional or "internal" form of Surround sound has developed into technology for stethoscopes creating "in-head" acoustics and IMAX movies creating a three dimensional acoustic experience.