dCS
Vivaldi One Digital Playback System User Manual
Software Issue 1.0x
September 2017
Vivaldi One Manual v1_0x
Page 42
English version
AUDIO SETTINGS Menu
Phase
Use this page to change the phase of all the analogue outputs from normal phase…
…to inverted phase, to correct for absolute phase errors on recorded music. This icon is
displayed when the outputs are inverted. Phase is reset to normal to power up.
Filter
The player features two sets of digital filters: one set for PCM and one set for DSD. The
PCM Filter is applied when the unit is receiving PCM data or while playing a CD. Filters
are a personal choice.
The player remembers the last filter set for every sample rate.
The first 4 PCM filters give different trade-offs between the Nyquist image rejection and
the phase response.
Filter 1
has the best rejection of (unwanted) Nyquist images and the
sharpest roll-off, resulting in the poorest transient response of the four. Filters 2, 3 and 4
have progressively more relaxed image rejection and progressively better transient
response.
Filter 2
is often preferred for orchestral music, while
Filter 3
and
Filter 4
are
often used for rock music.
If the source data rate is 176.4, 192, 352.8 or 384kS/s, two extra filters are available.
Filter
5
has a Gaussian response (which has no overshoot on transients, with a relaxed roll-off)
and
Filter 6
is an asymmetrical type (which features almost no pre-ringing).
There are 2 extra filters for 44.1kS/s operation also.
Filter 5
is an asymmetrical design
with non-linear phase and no pre-ringing.
Filter 6
is a new sharp filter which has linear
phase and pre-ringing. Try them and decide for yourself which you prefer.
The impulse responses for the six 44.1kS/s PCM filters are shown below. (The filters for other sample
rates will have different pulse responses.) The horizontal or time axis is graduated at 100 microseconds
per division.
Filter 1
Filter 2
Filter 3
Filter 4
Filter 5
Filter 6
DSD Filter
The DSD Filter is applied when the unit is receiving DSD data or when the DSD
Upsampling feature is active. While upsampling PCM data to DSD or DSDx2, both filters
are active, but only the PCM Filter setting appears on the display.
DSD mode has 5 filters, the first 4 progressively reduce the out-of-band noise level (which
is inherent in the 1-bit nature of DSD).
Filter 1
is the usual setting – it gives the widest
bandwidth (90kHz for DSD/64) and the highest level of out-of-band noise. If your system
sounds harsh, try
Filter 2
or
Filter 3
. These progressively reduce the out-of-band noise
level at the cost of some bandwidth.
Filter 4
is primarily intended for troubleshooting, not
listening, as it cuts off sharply (above 25kHz for DSD/64) to minimise the out-of-band
noise.
Filter 5
has a relaxed roll-off with a smoother phase response – this removes much
of the out-of-band noise.
