Dolby surround sound is widely used in the sound system of movies, and the home surround sound system is its modularization. It uses the original four-channel signals L (front left), R (front right), and C (center). S (back surround), after encoding, becomes a two-channel signal LT and RT transmission, and the decoder obtains a four-channel signal from these two signals for playback. In a movie theater or a home, pluralities of speakers are usually arranged sideways and rearwards for surround channel reproduction, and a delay circuit is generally inserted in the surround channel. However, in a typical home, since the room is small, the left and right speaker spacing is not large, it is often left out the front center channel.
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