In 1982, Dolby launched Dolby Surround ®, a version of Dolby Stereo for home entertainment systems. The subwoofer channel in both analog and digital surround-sound systems is sometimes called the low frequency effects (LFE) channel. Many moviemakers use the subwoofer to create a powerful rumbling in the theater, shaking the audience when there is an explosion or earthquake on-screen. In later versions of the surround-sound system, theater owners could hook up a subwoofer to handle extremely low-frequency sounds (a crossover unit can separate out these sounds from both audio tracks). Later movies followed the " Star Wars" model, using the surround track to create fantastic effects, as well as fill in background noise to establish a scene's setting.
In the next section, we'll learn a little bit about how surround sound was created and see how it was configured in older theaters.
Dolby digital sound test movie#
Sound editors and mixers take a number of different audio recordings - dialogue recorded on the movie set, sound effects recorded in a dubbing studio or created on a computer, a musical score - and decide which audio channel or channels to put them on. Almost all movie surround soundtracks are created in a mixing studio. There are special microphones that will record surround sound (by picking up sound in three or more directions), but this is not the standard way to produce a surround soundtrack. In this article, we'll use it in this generic sense. While the term "surround sound" technically refers to specific multi-channel systems designed by Dolby Laboratories, it is more commonly used as a generic term for theater and home theater multi-channel sound systems. Surround recordings take this idea a step further, adding more audio channels so sound comes from three or more directions. When you listen to these two channels on separate speakers, it recreates the experience of being present at the event. The simplest two-channel recordings, known as binaural recordings, are produced with two microphones set up at a live event (a concert for example) to take the place of a human's two ears. Two-channel sound is the standard format for home stereo receivers, television and FM radio broadcasts. This isn't entirely accurate, as stereo (or stereophonic) actual refers to a wider range of multi-channel recordings.
Two-channel recordings, in which sound is played on speakers on either side of the listener, are often referred to as stereo. Mono means that all the sound is recorded onto one audio track or channel (a single spiraled groove in a record, for example, or a single magnetic track on tape), which is typically played on one speaker. The simplest method, and the one used in the earliest sound movies, is called monaural or simply mono. There are many ways to make and present a sound recording.
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