Dolby Digital is often referred to as a 5.1 channel system. However, it must be noted that term "Dolby Digital" refers to the digital encoding of the audio signal, not how many channels it has. In other words, Dolby Digital can be Monophonic, 2-channel, 4-channel, 5.1 channels, or 6.1 channels. However, in its most common applications, Dolby Digital 5.1 and 6.1 is often referred to as just Dolby Digital.
http://hometheater.about.com/od/beforeyoubuy/a/surroundsound_3.htm
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