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Simon, Ellen. "WiFi Phones: Wave of the Future." CBS News. This signal can be represented as an oscillating wave. The result is that the two signals work opposite one another: When the surround signal in stream A tells the left speaker cone to move out, the signal in stream B tells the right speaker cone to move in. When the current fluctuates one way, the speaker cone moves in; when it fluctuates the other way, the cone moves out. The popular four-channel system included one channel driving a speaker on the left, one channel driving a speaker on the right, one channel driving a center speaker and one channel driving surround speakers along the sides and back of the theater. To set up a simple central speaker -- one that anchors the left and right stereo speakers -- just turn on your television. As the electromagnet moves, it pushes and pulls a speaker cone, which rapidly pushes out air and then pulls back in. It then quickly flies back to the left side, moves down slightly and paints another horizontal line, and so on down the screen. The audio channels are encoded as magnetic tracks on video tape or broadcast as a television signal, rather than put down as optical tracks.

In this system, originally used in the quadraphonic home stereo recordings of the early 1970s, four channels of audio information are encoded into two tracks. In the 1970s, Dolby Laboratories introduced a new sound format based on this same configuration. What is Surround Sound? Check out Dolby Surround Pro Logic Decoder: Principles Of Operation (PDF) for more information. Today, Dolby Stereo is the analog sound standard, thanks to its superior sound quality and relatively simple installation. It is possible to access surround sound with a standard stereo receiver, however, since all the information is actually included in the left and right channels. In the next section, we'll find out about the clever trick that makes this possible. The real trick is the braid. Magnetic tracks could not produce as clear a sound as the conventional optical audio tracks, and they tended to fade over time, but they took up a lot less space on the film.

Disney sound engineer William Garity took separate recordings of each orchestra section and mixed them to produce four distinct audio tracks, which were recorded as optical tracks on a separate reel of film. To understand how this works, you need to know a little bit about how speakers produce sound. Panning involves fading a sound (a violin melody, for example) from one audio channel while building it on another. 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 recordings, in which sound is played on speakers on either side of the listener, are often referred to as stereo. When an actor speaks on the right side, the sound comes from the right speakers. To do this, get a pair of rear speakers and position them to the left and right of the listener. Without this you can't ignite the fuel-air mixture to get the engine running. Today, theater audiences expect to hear sound coming from every direction; and the technology that once characterized only movie theaters is now fairly standard in home entertainment centers. Walt Disney's "Fantasia" (1941), one of the earliest surround-sound movies, immersed the audiences in classical music.

Dendrites can be located on one or both ends of the cell. Smart glass can also save you money by decreasing energy costs, and some even allow you to project images that keep time with music on the glass. Along with musical instruments, music sessions require special equipment, as well. Music recording sessions are often perceived as glamorous, but they actually involve considerable work and planning. Stereo televisions will also work decently for anchoring purposes, because both channels emanate from the area of the television. In a surround setup with no center speaker, the perfectly balanced center signals will create a "phantom speaker" (the illusion of a speaker) directly in between the left and right speakers. 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. There are many ways to make and present a sound recording. 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.

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