Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

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Aman101
Posts: 7
Joined: Sun Nov 25, 2018 8:38 pm

Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Aman101 »

My Setup:
A1 main:ASIO Focusrite USB Audio Driver, fs=44.1KHz
A2: USB asynchronous DAC, fs=44.1KHz
Assuming A2 sampling rate is slightly faster than A1 (about 100ppm), at some point A2 will not have data.
How is it possible then to have two outputs?
Are you re-sampling A2 in a way that add/subtract samples in-order to support the sampling rates difference?
Vincent Burel
Site Admin
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Joined: Sun Jan 17, 2010 12:01 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Vincent Burel »

do you have a problem ?
Aman101
Posts: 7
Joined: Sun Nov 25, 2018 8:38 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Aman101 »

My first sound-card is Traktor controller.
The second sound card will source the PA system through its AES/EBU output (same music data of course).
I am wondering whether sound quality is not affected by this setting, since re-sampling for the second sound-card is lossy.
Vincent Burel
Site Admin
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Joined: Sun Jan 17, 2010 12:01 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Vincent Burel »

why don't you try?
Aman101
Posts: 7
Joined: Sun Nov 25, 2018 8:38 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Aman101 »

I did, there did not seem to be a noticeable error.
Yet, I wanted to verify from a technical point of view rather than sound...
Vincent Burel
Site Admin
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Joined: Sun Jan 17, 2010 12:01 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Vincent Burel »

technical Voicemeeter is able to manage any samplerate on any points.
but practically the result must be evaluated by the user only.
Aman101
Posts: 7
Joined: Sun Nov 25, 2018 8:38 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Aman101 »

I understand that, my question is whether A2 output is a re-sampled version of A1...
Vincent Burel
Site Admin
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Joined: Sun Jan 17, 2010 12:01 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Vincent Burel »

if the samplerate is different, of course the SRC works.
Aman101
Posts: 7
Joined: Sun Nov 25, 2018 8:38 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Aman101 »

Thanks for the fast reply :)
I am referring to a configuration in which A1 and A2 are both set to 44.1KHz but there is slight PPM between them due asynchronous USB configuration.
My understanding is that SRC will have to be enabled to compensate for the PPM difference.
Am I correct?
Vincent Burel
Site Admin
Posts: 1429
Joined: Sun Jan 17, 2010 12:01 pm

Re: Voicemeeter using two USB SoundCards set to 44.1KHz with slight ppm

Post by Vincent Burel »

no, it's another problem, you have a delay between them (pending on audio interface selected and global latency), because output A1 is master while output A2 is slave (so processed after). then you can synchronize them by adding delay on output A1 (in voicemeeter system settings dialog box).
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