T+A DAC 8 Betriebsanleitung Seite 43

DSP set-up
option
Bandwidth




DSP set-up
option
Oversampling
(OVS)

With the  button, the bandwidth of the analogue output filter can
be switched between 60 kHz ('CLEAN' mode) or 120 kHz ('WIDE'
mode).
The 'WIDE' setting allows a more spacious music reproduction.
DSD signals are characterised by a high-frequency noise floor in the
ultra-sound region. This noise is inherent in the DSD principle, and is
present in the recording itself. In basic terms the higher the sampling
rate, the lower the high-frequency noise. At 2,8 MHz (DSD64) this
noise is by no means negligible, and may constitute a problem for
amplifiers and loudspeakers connected to the system. For this reason,
the bandwidth cannot be switched to the 'WIDE' mode when playing
2,8 MHz DSD files (DSD64).
Please refer to the Chapter 'Technical description - Digital filters /
Oversampling ' for an explanation of the 'WIDE' mode.
The following settings are only available when PCM audio is
played.
The DAC 8 DSD can exploit four different filter types offering different
tonal characters:
A brief press on the  button toggles between the FIR
oversampling types 1 (blue LED) and 2 (red LED).
 Oversampling 1 (FIR 1) is a classic FIR filter with an extremely
linear frequency response.
 Oversampling 2 (FIR 2) is a FIR filter with improved peak handling.
Briefly pressing the  button toggles between the Bezier
oversampling types 1 (blue LED) and 2 (red LED).
 Oversampling 3 (Bez 1) is a Bezier interpolator combined with a IIR
filter. This process produces a result very similar to an analogue
system.
 Oversampling 4 (Bez 2) is a pure Bezier interpolator – offering
perfect "timing" and dynamics.
Please refer to the Chapter 'Technical description - Digital filters /
Oversampling ' for an explanation of the different filter types.
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