michael123;574532 Wrote: > Dithering is usually used in conjunction with noise shaping...(which I > clearly see in some CD tracks in Audacity.. blue band / spectrum view > around 18-21KHz) > > No dithering shall be applied in upsampling from 44.1/16 to 96/24. It > was a bug, and the developer already received some "kind words" (I saw > the correspondence on the sox mailing list) > > Going back from 32bit (internal sox representation) to 24bit will > indeed just cut lower 8bit, but that's beyond 144db.. I could not care > less.. It is just a noise anyway Michael, I'm no expert, but I am very > familiar with the views of Meridian's Bob Stuart who *does* know a thing or two about dither. He says (in the Meridian 518 manual): > DITHER > Dither is an essential lubricant if a digital audio channel that > includes processing is to remain transparent. > > Transparency in a digital channel is the result of maintaining > linearity at both high and low levels and not falling prey to > signal-processing distortions like, for example, noise modulation. > > It is well established that in order for linearity to be maintained, > dither must be applied at every non-trivial processing stage. [b]By > non-trivial, we include all operations that modify a sample.[/i] With > very few exceptions, arithmetic operations which modify a sample result > in an increase in the number of bits representing the output result; in > a fixed channel size, this can therefore lead to truncation or > quantisation effects. He is also very clear that dither should be applied > when increasing sample word size.
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