192 kHz audio is less clear at the present, though some feel that PCM, by it's nature, will always be at a disadvantage. There is clearly not consensus on this point, however. PCM advocates point out many disadvantages to the DSD system as compared to PCM, so we'll have to wait and see. It is clear, however, that both DVD-A and SACD are a major leap forward from CD. It should be mentioned that SACD also has provision for including some visual extras, but not to theextent and elegance of the DVD implementation. 5.1 surround sound has been included in the goals for the SACD format, as has a red book compliant layer to provide backward compatibility with CD players. Unfortunately, these two options are unavailable at the moment and are proving difficult to provide practically, though I imagine that eventually they will work out the Kinds in one way or another.Dolby Surround: This is primarily a consumer format that adds a mono, band limited surround channel that is matrixes into the stereo audio and passively decoded at playback. The playback is compatible with stereo if you don't have a decoder.Dolby Pro-Logic: This is another matrix approach to surround, however you add a center channel to the matrix for a total of 4 channels. They are not fully discrete, nor the extra channels full bandwidth. This is similar to the "Dolby Stereo" or "Dolby SR" film release formats.Dolby SR: To music recordists and mixers it means the "Spectral Recording" noise reduction system for analog tape. To film mixers it means an LCRS surround mix matrixes into the stereo signal, and using Dolby SR noise reduction.Dolby Stereo: An earlier 4-channel matrixes surround format using Dolby A type noises reduction.LCRS: Left, Center, Right, Surround. The 4 channels in the passive matrix systems of Dolby Pro-Logic, Dolby Stereo, and Dolby SR.Dolby SR-D: This 35mm film release format has both the analog Dolby SR soundtrack and a Dolby Digital 5.1 soundtrack. If the digit...
