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Re: Yeah right!!!

Dear TAH,

I agree with you that the average SONY player may not define the absolute upper limit, but they are not that far away either, I have already heard several of the "brave" efforts of the people you mention and that has only helped to reinforce my view that, the upper limit of performance in SACD is defined by the way the signal enters the digital domain, not what happens after, it is a bit stream system and works this way,

A Delta Sigma (bitstream) ADC works by grossly oversampling the input with an intrinsically inaccurate ADC. Then an error signal is fed back to the input via as many as seven or more paths via integrators and clippers to avoid instability. Then this low bit but high sampling rate is decimated down to the required output rate by decimation (mathematical interpolation). The analogy to this is like the difference between Butter and Margarine, one is a natural product and the other is a vegetable oil which is highly processed to taste similar. But perhaps you prefer Margarine on your crumpets and cannot taste the difference?

A similar process takes place in reverse within a Sigma Delta DAC and adds further non-music related artifacts.

This is why the ceiling of SACD performance can already be defined as extremely limited.

Sincerely,
Peter Qvortrup



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