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Direct Sound In/ Out Sync
Posted: Thu Aug 20, 2020 1:44 pm
by arend
Hello,
Looking for your help. I am trying to use the computer sound board as a low frequency "vector analyser", injecting a variable frequency signal (DS Out) to an input circuit (filter) and reading the output circuit through the DS In, so calculating the attenuation and phase between in/out. The issue is related with the phase, each time that the sin signal frequency is changed, the delay changes too (circuit independently). Sounds that the Direct Sound Out buffer is not synchronized with the Direct Sound In buffer.
Thank you !
Arend
Re: Direct Sound In/ Out Sync
Posted: Thu Aug 20, 2020 1:49 pm
by lalalandsynth
Latency , would be better with Asio but you will still have latency .
Re: Direct Sound In/ Out Sync
Posted: Thu Aug 20, 2020 3:09 pm
by arend
lalalandsynth wrote:Latency , would be better with Asio but you will still have latency .
The latency could be compensated, if not changing all time (at frequency steps).
Thank you !
Re: Direct Sound In/ Out Sync
Posted: Thu Aug 20, 2020 4:30 pm
by deraudrl
The only reason I can imagine that latency would be frequency-dependent would be that there is a LPF on the output of the soundboard's DAC, and what you're seeing is its phase delay. Shouldn't be difficult to measure and compensate for, but I suspect its characteristics would vary between different boards.
Re: Direct Sound In/ Out Sync
Posted: Fri Aug 21, 2020 7:30 am
by DSP-Robotron
lalalandsynth wrote:Latency , would be better with Asio but you will still have latency .
The latency comes from FlowStone because it's accumulating all the open schematics on top of each other while showing you only the last one on the screen. That also explains why the results are 10 to 40 times slower than Synthedit.
Tell them to fix it and I need a free beta to play with. Preferably one that is not so extremely buggy like the current demo version (3.0.8.1 Skylark). Thanks.
Re: Direct Sound In/ Out Sync
Posted: Fri Aug 21, 2020 1:13 pm
by Spogg
DSP-Robotron wrote:The latency comes from FlowStone because it's accumulating all the open schematics on top of each other while showing you only the last one on the screen. That also explains why the results are 10 to 40 times slower than Synthedit.
Tell them to fix it and I need a free beta to play with. Preferably one that is not so extremely buggy like the current demo version (3.0.8.1 Skylark). Thanks.
Please refer to my comment on another thread here:
viewtopic.php?f=2&t=4189&start=130#p162768Cheers