ifi Pro iDSD - Digital Filter Selection; Direct - Bit-Perfect Mode; PCM Upsampling and Filters

4. Digital lter selection
The Pro iDSD offers the following three choices of digital processing:
i) Direct – Bit-Perfect
Both PCM and DSD signals are not processed in any way.
For PCM this is effectively what is sometimes called "non-oversampling" or "zero-oversampling". For
DSD it means the le is retained in the original DSD format and directly converted to analogue without
any digital processing.
ii) PCM - Upsampling
In this case PCM is up-converted to 16 x PCM (705.6/768kHz) using a choice of digital lters.
The following ve digital lters are available:
No digital ltering is applied, one tap'Bit-Perfect'
No digital ltering is applied, one tap, SINC roll-off is corrected'Bit-Perfect+'
Minimum ltering, no pre-ringing, minimum post ringing, 32 taps'Gibbs Transient Optimised'
Modest ltering, no pre-ringing, modest post ringing, 128 taps'Apodising'
Max ltering, max pre-ringing, maximum post-ringing, 16,384 taps'Transient Aligned'
The digital lter selections can be made 'on the y' to suit the listener's preferences.
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