audiopraise VanityPRO Manuel de l'utilisateur - Page 7
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It is strongly recommended to use high quality 5V power supplies, ideally linearly
regulated. Alternatively, multi-port premium and low noise USB chargers can be used. The power
quality directly influences the quality of the output audio signal. Therefore, high quality power
supplies are essential.
Both parts of the unit can be powered independently. The HDMI part is capable of working
on its own without the audio and control part powered up.
Synchronization Clocks
There are two synchronization clock outputs provided on BNC connector with 50Ω output
impedance. The purpose of these two clock outputs is to synchronize any downstream audio
devices such as a DAC equipped with a synchronization clock input. The advantage of external
synchronization is usually in better and cleaner clock signal available for the digital to analogue
conversion process compared to a clock recovered from a S/PDIF or AES/EBU stream.
There are "Word Clock" and "Super Clock" signals provided. The Word Clock is a sampling
frequency clock Fs, while the Super Clock is either 22.5792MHz or 24.576MHz.
Theory of Operation
Block diagram
2x Audio
Oscillator
USB
Block Diagram of the Vanity
HDMI Extractor
The HDMI interface has combined functionality of a HDMI extractor as well as a repeater.
The main difference between both modes is in handling the EDID data. While in the extractor
mode (default), full audio capabilities in terms of formats (PCM/DSD) and sampling rates are
reported back to the HDMI source, the repeater mode passes through the EDID information from
the connected downstream HDMI sink (TV or projector). The other difference is that in the
extractor mode the audio data are removed from the output HDMI stream and only video part of
the original stream is passed through.
Digital Audio
Clock
Output Stage
DAC
FPGA
Control
MCU
Control
PRO
showing the main digital audio and control signals
Page 7 of 19
Vanity
PRO
Extractor/Repeater
Digital
Audio
Control
– User Manual v1.2
HDMI