audiopraise VanityPRO 사용자 설명서 - 페이지 9

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DSD Processing Engine

DSD to PCM Conversion

One of the key features of the Vanity

PCM format. We have developed a high quality DSD to PCM conversion algorithm to enable owners

of stand-alone DACs to enjoy their favourite SACDs or DSD recordings in the highest quality

possible. The conversion engine has user adjustable characteristics to slightly vary the frequency

roll-off and subsequently the amount of residual ultrasonic noise inherent to the DSD format. The

user can also control the output sample rate and bit depth.

The DSD to PCM conversion algorithm implemented in the Vanity

equivalent to -3dB(FS) PCM level. This approach preserves maximum quality, provides sufficient

headroom for clipping-free signal peaks and over-modulation, and still does not unnecessarily

reduce playback volume in comparison to PCM playback.

DSD and PCM Level Matching

The DSD to PCM conversion produces overall signal level 3dB lower compared to PCM

playback. This is usually not an issue, but thanks to the precision volume control function, the

output levels of DSD and PCM playback can be matched by attenuating PCM signal by 3dB. A

positive side effect is that this helps to create sufficient headroom for inter-sample peaking with

PCM material and DACs that don't provide such headroom by design.

DoP v1 output mode

PRO

The Vanity

can be also set to output DSD signal in so called DoP format (DSD Over PCM).

This allows the user to send raw DSD material directly to a DoP compatible DAC. More details can

be found here:

http://dsd-guide.com/sites/default/files/white-papers/DoP_openStandard_1v1.pdf

DSD 4.0 Down-Mix

To achieve the best performance during digital DSD playback, it is essential to avoid the

DSD to PCM conversion done by the HDMI source. Universal players can sometimes perform such

task for downmix purposes. For this reason, the widely used 4.0 speaker configuration is covered

by the dedicated down-mix algorithm implemented in the Vanity

overall signal level balance between channels, and it can be described as follows.

To fit the mixed Center and Low-Frequency Effect channels into the front channels, the

overall signal level is shifted by -6dB. No additional signal normalization or scaling is applied.

Since the down-mix processing is carried out with full precision, there is no adverse effect on

sound quality such as reduced dynamics or worse noise figures. The 4.0 downmix can be

performed correctly only with multi-channel 5.1 DSD tracks. If the Vanity

universal player, the SACD playback priority should be checked or correct setting.

PRO

is the DSD signal processing and conversion to the

= 0.5FL+0.25C+0.25LFE

mix

= 0.5FR+0.25C+0.25LFE

mix

= 0.5SL

mix

= 0.5SR

mix

Page 9 of 19

– User Manual v1.2

Vanity

PRO

sets 0dB SACD level

PRO

. The algorithm preserves the

PRO

is connected to a