| 摘要 |
An AC-3 decoder output signals of five channels, i.e., main signals of left front, center front and right front channels and surround signals of two channels. A first synthesizing section synthesizes the three-channel main signals and a difference signal between the two-channel surround signals, and the resultant synthesized signals are then fed to a main sound field signal forming section which in turn forms main sound field signals. A second synthesizing section synthesizes the surround signals of the two channels and a difference signal between the main signals of the left and right channels, and the resultant synthesized signals are fed to a surround sound field signal forming section which in turn forms surround sound field signals. A composite sound field forming section synthesizes the main sound field signals, surround sound field signals and original surround signals so as to form composite sound field signals. The main signals of the three channels are reproduced via a set of left-, center- and right-front speakers, and composite sound field signals are reproduced via another set of left- and right-front speakers and left- and right-rear speakers.
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