Audiopraise VanityPRO Manual de usuario

Vanity

PRO

User Manual

Vanity

PRO

–User Manual v1.2

Page 2of 19

Table of Contents

Introduction................................................................................................................................................... 3

HDMI Audio ............................................................................................................................................... 3

VanityPRO .................................................................................................................................................... 3

Description .................................................................................................................................................... 4

Front .......................................................................................................................................................... 4

Back ........................................................................................................................................................... 4

Output Boards ........................................................................................................................................... 5

User Interface................................................................................................................................................ 5

Installation..................................................................................................................................................... 6

AV Signals .................................................................................................................................................. 6

Power......................................................................................................................................................... 6

Synchronization Clocks.............................................................................................................................. 7

Theory of Operation ...................................................................................................................................... 7

Block diagram ............................................................................................................................................ 7

HDMI Extractor.......................................................................................................................................... 7

Clock Recovery and Jitter Reduction......................................................................................................... 8

DSD Processing Engine .............................................................................................................................. 9

DSD to PCM Conversion ........................................................................................................................ 9

DSD and PCM Level Matching ............................................................................................................... 9

DoP v1 output mode ............................................................................................................................. 9

DSD 4.0 Down-Mix................................................................................................................................. 9

Volume Control ................................................................................................................................... 10

Dielectric Barrier...................................................................................................................................... 10

Menu system ............................................................................................................................................... 10

Home Screen ........................................................................................................................................... 11

Audio Setup ............................................................................................................................................. 11

Filters Characteristics .......................................................................................................................... 12

System Setup ........................................................................................................................................... 14

HDMI AV Info........................................................................................................................................... 14

Audio Meters........................................................................................................................................... 15

System Status .......................................................................................................................................... 15

Software Update ......................................................................................................................................... 16

Troubleshooting .......................................................................................................................................... 17

Specifications............................................................................................................................................... 18

Disclaimer .................................................................................................................................................... 19

Vanity

PRO

–User Manual v1.2

Page 3of 19

Introduction

The Vanity

PRO

is a multi-channel HDMI digital audio extractor with advanced signal

processing built in. It enables the user to turn virtually any compatible HDMI source into a high-

quality, up to eight-channel digital audio transport which supports PCM and DSD audio formats.

HDMI Audio

HDMI is the primary method of transporting AV signals in the consumer environment. It

works great with high resolution audio and video, but it has never found its way into the hi-fi

world.

Apart from some non-technical reasons, one of the biggest issues associated with HDMI

audio is quality of the clock recovered from the HDMI stream and electrical noise associated with

it. Despite many improvements in the newest HDMI receiver devices, the recovered clock always

suffers from high levels of phase noise. While this is usually not an issue in consumer audio –

home theatres, sound bars, etc., in the discipline of critical listening the imperfections of HDMI

audio are instantly noticeable. Also, HDMI audio is notoriously known to be sensitive to various

forms of electro-magnetic interference, cabling quality, ground loops and in the hi-fi world

generally considered as inferior when compared to dedicated digital audio transport methods

such as SPDIF, AES/EBU or proprietary links based on the I2S bus.

There is usually nothing wrong with the audio data itself, provided the receiver can take

advantage of all the digital formats and sampling rates available on the source side. What can

cause issues is mainly the way the audio data is packed and interleaved with the video data in a

high frequency digital signal and eventually recovered on the HDMI receiver (sink) side. There are

many cheap HDMI audio extractors on the market, and some of them being able to output digital

audio via S/PDIF up to 192kHz sampling rate. But they still don’t come even close to a good digital

transport in terms of audio quality.

VanityPRO

How is the Vanity

PRO

different from all the other HDMI audio extractors? It basically

addresses all the imperfections associated with the HDMI audio, one by one, with a ton of extra

features the others don’t have.

•Galvanically isolated HDMI interface from the sensitive audio output circuitry with

separate power connections.

•Ability to receive PCM and DSD formats at all sampling rates (PCM up to 192kHz).

•Sophisticated clock recovery using our in-house developed DBLL (Digital Buffer Locked

Loop) system with two custom-made low noise oscillators.

•High quality DSD to PCM conversion with user configurable parameters.

•DSD to DoP conversion for raw DSD data output.

•Up to 8-channel support.

•Ultra-low noise regulators for the clocks and digital audio outputs.

•HDMI link monitoring and diagnostics.

•Configurable output connectivity for stereo and multi-channel setups.

Vanity

PRO

–User Manual v1.2

Page 4of 19

Description

Front

Back

1) RGB LCD 320*240 Screen

2) Stand-by and Status LED Indicator

3) Rotary Encoder with Push-button







1) HDMI DC Power Input, 5V/1A, USB-C

2) HDMI Output

3) HDMI Input

4) Digital Audio Output Board (Stereo board shown)

5) Word-Clock Output (44.1kHz to 192kHz)

6) Super-Clock Output (22.5792MHz or 24.576MHz)

7) Service Port, USB-B

8) Audio DC Power Input, 5V/1A, USB-C





Vanity

PRO

–User Manual v1.2

Page 5of 19

Output Boards

For maximum flexibility, the Vanity

PRO

features an interchangeable output module with

various configurations of the output connectors. There are 4 options in total, covering 1 stereo

and 3 multichannel configurations with RCA, BNC and XLR connectors.

Stereo output Board BNC Multi-channel Output Board

XLR Multi-channel Output Board RCA Multi-channel Output Board

User Interface

The unit is operated using a rotary encoder with a push-button function and an LCD

screen. The navigation is easy through a series of screens with options and metering & diagnostic

data.

•Turing the rotary encoder left and right changes the screen, moves between options in a

configuration menu or selects from multiple options.

•Pushing the knob in one of the two configuration screens will enter the sub-menus.

•Pushing the knob with an item highlighted will enter the item configuration.

•Once the correct option is selected by turning the knob left and right, pushing the knob

again will confirm the selection and return into the menu.

•To exit the menu and go back to the screen selection, long (2 seconds) push of the knob

is required.

•The knob is also used to toggle between stand-by and normal operation of the unit. Long

push the knob to turn the unit on from the stand-by mode. Long push the knob in the

home screen to enter stand-by mode.

Vanity

PRO

–User Manual v1.2

Page 6of 19

Installation

AV Signals

The typical installation of the Vanity

PRO

consists of a HDMI signal source capable of

delivering all compatible digital audio formats and sampling rates, such as a universal player or a

PC and a stereo/multi-channel DAC or audio processor, that can take advantage of the high-

quality and high-resolution S/PDIF or AES/EBU signals. Optionally, the user can connect a HDMI

sink such as a TV or a projector to the HDMI output of the Vanity

PRO

for video pass-through.

The HDMI connectors are quite delicate and should be plugged and unplugged carefully

without excessive force or wiggling to prevent damage. The same applies to the power USB-C

connectors.

Typical signal connections of the Vanity

PRO

Power

The Vanity

PRO

has two independent power inputs. One for the HDMI part, one for the audio

part. The power supplies must meet the voltage and current requirements (see specifications).

5V linear power supply

Power connection of the Vanity

PRO

Vanity

PRO

BD/SACD Player

PC with HDMI Audio output

Projector

High Quality DAC

HDMI Out HDMI In

S/PDIF Out

Vanity

PRO

–User Manual v1.2

Page 7of 19

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 50Ωoutput

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

Block Diagram of the Vanity

PRO

showing the main digital audio and control signals

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.

HDMI

Extractor/Repeater

FPGA

MCU

Digital Audio

Output Stage

2x Audio

Oscillator

DAC

Dielectric Barrier

Control

Audio

Clock

Control

Digital

USB

Control

Vanity

PRO

–User Manual v1.2

Page 8of 19

Clock Recovery and Jitter Reduction

To deal with one of the major technical imperfections of the HDMI interface, the Vanity

PRO

uses a pair of low-jitter digitally controlled oscillators and an adaptive control algorithm to lock

onto the incoming audio frequency and output the audio data with perfect timing, completely free

of any jitter or noise of the HDMI interface.

Block diagram of the clock recovery system

Audio data from the HDMI interface is buffered in FIFO memory and clocked out with local

high precision oscillators. As a result, the output signal is completely isolated from the noisy HDMI

domain - interferences from the power supplies, video circuits, etc.

Eye diagram of the output S/PDIF signal. Generic HDMI audio extractor –left, Vanity

PRO

–right.

Effectiveness of the clock recovery system can be seen in the two oscilloscope waveforms

above. There are waveforms with persistence enabled of the output S/PDIF signal –from a generic

HDMI extractor on the left and the Vanity

PRO

on the right. The time base is delayed by 10ms to

show accumulated phase noise using the colour grade. The difference in signal edge timing and

definition can be clearly seen.

Vanity

PRO

–User Manual v1.2

Page 9of 19

DSD Processing Engine

DSD to PCM Conversion

One of the key features of the Vanity

PRO

is the DSD signal processing and conversion to the

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

PRO

sets 0dB SACD level

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

The Vanity

PRO

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

PRO

. The algorithm preserves the

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

FLmix = 0.5FL+0.25C+0.25LFE

FRmix = 0.5FR+0.25C+0.25LFE

SLmix = 0.5SL

SRmix = 0.5SR

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

PRO

is connected to a

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

Vanity

PRO

–User Manual v1.2

Page 10 of 19

Volume Control

A part of the processing engine is also full precision volume control. It is used not only for

DSD and PCM level matching, but it also gives the user full control of the overall output level. With

0dB setting (maximum volume) the digital signal path is bit accurate.

All the digital audio processing is performed by a medium sized FPGA. The firmware for

the FPGA is user-upgradeable, together with the main processor firmware, to add new features

and functionality in the future.

Dielectric Barrier

There is a galvanic barrier put between the HDMI and the audio parts to limit the

electromagnetic noise from the HDMI domain influencing the sensitive audio and clock circuits in

the audio domain. Another advantage of this feature is the option to power the two functional

parts independently from separate power supplies. The audio part can be powered from a high

quality and low noise, possibly linear, power supply without the risk of being plagued by the noise

from the switching regulators on the HDMI side.

Dielectric domains of the Vanity

PRO

shown in the 3D model of the main PCB

Menu system

The menu system is structured into several screens. Some screens are used for monitoring

of the HDMI stream and incoming audio signal properties, while other are used to set the system

and audio processing parameters.

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