The PCM process makes extremely high-resolution sampling values
available: up to 32 bits. However, the sampling rate of PCM is significantly
lower than that of DSD, and the spacing in terms of time between the
sampling values is greater.
This means that it is extremely important with PCM to employ maximum
possible precision when converting the high resolution into analogue signals.
Here at
a four-fold improvement in accuracy over conventional converters. A further
very important aspect of PCM reproduction is to reconstruct the curve of the
original analogue signal between the sampling points with great accuracy,
since these points are much more widely spaced in comparison with DSD. To
this end the SDV 3100 HV employs a polynomial interpolation process
(Bezier-Spline interpolation) developed in-
mathematical terms delivers the smoothest curve for a given number of
reference points (sampling points). The output signal generated by Bezier
interpolation exhibits a very “natural” shape, devoid of the digital artefacts -
such as pre- and post-oscillation - which are usually produced by the
standard oversampling process. More detailed information on this can be
found in the chapter “Technical description, oversampling / up-sampling”
And one final comment: If you intend to carry out your own tests to decide
whether DSD or PCM is the superior format, please be sure to compare
recordings with comparable information density – i.e. DSD64 with
PCM96/24, DSD128 with PCM 192 and DSD256 with PCM384!
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