Meridian Audio Digital Surround Controller G61 ユーザーズマニュアル

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The Ambisonics preset allows you to decode multi-channel sources 

which have been encoded in Ambisonics B format. 

Ambisonics B format contains four independent channels of 

information to give a three-axis representation of the sound at the 

recording position. The signals are: mono sound pressure, left-right 

velocity component, front-back velocity component, and up-down 

velocity component. 

If the input format is Dolby Digital, the  5.1 Movie DSP presets 

provide an additional  Compress parameter to allow you to take 

advantage of the dynamic range information provided in the 

Dolby Digital format to provide dynamic range control without the 

distortion involved in analogue methods.