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XXHighEnd > Ultimate Audio Playback > Your thoughts about the Sound Quality > Digital Volume Control
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Author Topic: Digital Volume Control  (Read 10764 times)
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andy74
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« on: August 18, 2008, 03:40:46 pm »
Hi Peter!

Is it explained somewhere on this site how exactly your Digital Volume Control (DVC) works? I couldn't find it.
I am trying to understand how this can be done bit perfect (or better to say level perfect).
The only case I see so far is for example when you play 16 bit file on a 24 bit DAC with DVC set to 48 dB.
Then you map -32768/+32767 possible levels of a 16 bit signal exactly to the lowest levels of -8388608/+8388607 possible levels of 24 bit signal.
In this case the form of a wave is not altered.

But I am afraid in other cases the wave form will be "slightly" different.
Can you please point to a thread where you explained it already.
Or can you share your algorithm with us.

Thanks
Andrey
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PeterSt
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« Reply #1 on: August 20, 2008, 12:39:35 pm »
Hi Andrey,

I don't think it was explained somewhere because I kept it for myself.

Of course it can't be bit perfect, but it sure can be 100% without loosing data *except* for the data that disappears in the noise anyway. This was rather extensively explained somewhere in here (I just tried to find it (two topics I think) but failed on that).

What it comes down to, is that when you do *not* calculate (in whatever bit depth domain) anything, but know you will loose the bit, you better throw away that bit and keep everything else untouched. It is this latter doing the trick (combined with the appropriate attenuation levels !), and which even allows to use the digital volume in the 16 bit domain. But : with 16 bits one must be very careful not attenuating too much, because the audible level (range !) is very close to the noise level (96 dB).

This topic(s) I can't find now is about this range of what one can hear.
Peter
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« Reply #2 on: December 12, 2008, 02:02:21 am »
Quote from: PeterSt on August 20, 2008, 12:39:35 pm

Of course it can't be bit perfect, but it sure can be 100% without loosing data *except* for the data that disappears in the noise anyway. This was rather extensively explained somewhere in here (I just tried to find it (two topics I think) but failed on that).

hmm...
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« Reply #3 on: December 12, 2008, 02:09:47 am »
... which is different from molesting the data which every even 48bit internal processing does, once it has to end up in a 16 bit DAC again ...

secret
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For the Stealth III LPS PC :
W10-14393.0 - July 17, 2021 (2.11)
XXHighEnd Mach III Stealth LPS PC -> Xeon Scalable 14/28 core with Hyperthreading On (set to 14/28 cores in BIOS and set to 10/20 cores via Boot Menu) @~660MHz, 48GB, Windows 10 Pro 64 bit build 14393.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/0/0/*1*/ Q1Factor = *4* / Dev.Buffer = 4096 / ClockRes = *10ms* / Memory = Straight Contiguous / Include Garbage Collect / SFS = *10.13*  (max 10.13) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / Stop Desktop, Remaining, WASAPI and W10 services / Use Remote Desktop / Keep LAN - Not Persist / WallPaper On / OSD Off (!) / Running Time Off / Minimize OS / XTweaks : Balanced Load = *62* / Nervous Rate = *1* / Cool when Idle = n.a / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = Optimal / Time Stability = Stable / Custom Filtering *Low* (16x) / Always Clear Proxy before Playback = On -> USB3 from MoBo -> Lush^3
A: W-Y-R-G, B: *W-G* USB 1m00 -> Phisolator 24/768 Phasure NOS1a/G3 75B (BNC Out) async USB DAC, Driver v1.0.4b (16ms) -> B'ASS Current Amplifier -> Blaxius*^2.5* A:B-G, B:B-G Interlink -> Orelo MKII Active Open Baffle Horn Speakers. ET^2 Ethernet from Mach III to Music Server PC (RDC Control).
Removed Switching Supplies from everywhere (also from the PC).
For a general PC :
W10-10586.0 - May 2016 (2.05+)
*XXHighEnd PC -> I7 3930k with Hyperthreading On (12 cores)* @~500MHz, 16GB, Windows 10 Pro 64 bit build 10586.0 from RAM, music on LAN / Engine#4 Adaptive Mode / Q1/-/3/4/5 = 14/-/1/1/1 / Q1Factor = 1 / Dev.Buffer = 4096 / ClockRes = 1ms / Memory = Straight Contiguous / Include Garbage Collect / SFS = 0.10  (max 60) / not Invert / Phase Alignment Off / Playerprio = Low / ThreadPrio = Realtime / Scheme = Core 3-5 / Not Switch Processors during Playback = Off/ Playback Drive none (see OS from RAM) / UnAttended (Just Start) / Always Copy to XX Drive (see OS from RAM) / All Services Off / Keep LAN - Not Persist / WallPaper On / OSD On / Running Time Off / Minimize OS / XTweaks : Balanced Load = *43* / Nervous Rate = 1 / Cool when Idle = 1 / Provide Stable Power = 1 / Utilize Cores always = 1 / Time Performance Index = *Optimal* / Time Stability = *Stable* / Custom Filter *Low* 705600 / -> USB3 *from MoBo* -> Clairixa USB 15cm -> Intona Isolator -> Clairixa USB 1m80 -> 24/768 Phasure NOS1a 75B (BNC Out) async USB DAC, Driver v1.0.4b (4ms) -> Blaxius BNC interlink *-> B'ASS Current Amplifier /w Level4 -> Blaxius Interlink* -> Orelo MKII Active Open Baffle Horn Speakers.
Removed Switching Supplies from everywhere.
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