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Low latency secondary input (microphone)
https://forums.stereotool.com/viewtopic.php?t=853		 Page 30 of 75
Author:  hvz [ Fri Jan 15, 2010 6:48 am ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
now it's almost perfect! blckovrlp=0 Highpass=off. Now Bass is same quality as blckoverlap=100 + highpaas=on :) That is nice.

edit:
4096 - BASS is Awesome!! much better and cleaner and same level as 4.22 (maybe even higher) ! Highs are at same level as 4.22 and bit cleaner.. all with blckoverlap=0.
Highpass missing, i hope it will be good too.
Ok - this is weird. Because I'm measuring a MUCH lower bass level (0.5 dB softer). Will check again tonight!
Author:  Bojcha [ Fri Jan 15, 2010 9:18 am ]
Post subject:  Re: Low latency secondary input (microphone)
i just measure again...
beta3a blckoverlap=0, preset web-bassboost, 50Hz bass is exactly same level as v4.22, but much cleaner.
Author:  hvz [ Fri Jan 15, 2010 9:56 am ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
i just measure again...
beta3a blckoverlap=0, preset web-bassboost, 50Hz bass is exactly same level as v4.22, but much cleaner.
Yes, but that's for a single tone. If you play music instead, the bass level is lower. (Note: If it's still clean, I could boost the bass a bit afterwards - the peak level of the waveform that comes out is also a bit lower. But I expect that the bass level goes up and down continuously.
Author:  Bojcha [ Sat Jan 16, 2010 3:02 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Hi Hans..
I notice one thing in latest beta3a (maybe with erlier happens but i did;t try) ...
I put it on our transmitter (turned off stereoboost and highpass) blckoverlap=0) and if i put "left slope width" from 100 to 90% i get much higher FM output.

btw .. again.. cpu usage is much better on blckoverlap=0 .. and quality is far better. Maybe is needed some small tweaks but for now is very good.
Author:  hvz [ Sat Jan 16, 2010 8:11 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
Hi Hans..
I notice one thing in latest beta3a (maybe with erlier happens but i did;t try) ...
I put it on our transmitter (turned off stereoboost and highpass) blckoverlap=0) and if i put "left slope width" from 100 to 90% i get much higher FM output.

btw .. again.. cpu usage is much better on blckoverlap=0 .. and quality is far better. Maybe is needed some small tweaks but for now is very good.
First small tweak is coming up (building it right now), it turns out that the volume calculation (used for "clean/punch") was incorrect. That caused part of the lower bass level.

The bass protection filters also lower the bass level a bit, but that should (I need to check it!) only be if it was too loud in the first place.

The bass when not using "Block Overlap = 0" should be a bit better now.


If you touch the "slope width" or "overlap size" sliders with block overlap 0, very strange things may happen - the output may be higher but it will also contain HUGE peaks. Please leave them at their defaults!

(Note: I will eventually implement the "slope width" sliders as a means to further reduce the CPU load - but I'll do that when the rest is finished).


Edit: Build is still running and I have to go somewhere now. So the update will be posted later tonight. But I have some good news too: I think I just found a solution to convert the Stereo Boost filter to Overlap=0 mode...
Author:  hvz [ Sat Jan 16, 2010 11:00 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Uploaded - BETA3A again.
Author:  Bojcha [ Sun Jan 17, 2010 3:33 am ]
Post subject:  Re: Low latency secondary input (microphone)
Low-Bass on 512 mode is perfect (and much more level) with blockoverlap=0 ans SlopeOverlap 1-3% :o :D
In the same time mid-lows are missing, but sound is still very clean. No Bass ringing.

For BlockOverlap >0 ... i must ask why is that mode important now.. when with mode blockoverlap=0 is much better results ?
Author:  hvz [ Sun Jan 17, 2010 5:13 am ]
Post subject:  Re: Low latency secondary input (microphone)
Small update: Highpass filter is more or less functioning now in "Overlap 0" mode. However:
1. Make sure that you DON'T use the highpass filter with Overlap > 0 before switching to Overlap 0 for the first time, or you'll get horrible clicking sounds. I don't know yet what's causing it, if you move to Overlap 0 before turning Highpass on there's no problem.
2. It's not as good as in Overlap > 0 mode (there are some remaining sounds at the end of each processing block, that's every 2048 samples in 4096 latency mode).
Author:  hvz [ Sun Jan 17, 2010 5:15 am ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
Low-Bass on 512 mode is perfect (and much more level) with blockoverlap=0 ans SlopeOverlap 1-3% :o :D
In the same time mid-lows are missing, but sound is still very clean. No Bass ringing.

For BlockOverlap >0 ... i must ask why is that mode important now.. when with mode blockoverlap=0 is much better results ?
Not everything is working yet in "Overlap = 0" mode.

I'm surprised about the SlopeOverlap - that shouldn't be the case :shock:
Author:  Bojcha [ Sun Jan 17, 2010 5:29 pm ]
Post subject:  Re: Low latency secondary input (microphone)
Quote:
I'm surprised about the SlopeOverlap - that shouldn't be the case :shock:
It's good with slope overlap=0 .. just a bit cleaner lows with slope 1-3% .. not so important.

High Pass works now witd block overlap=0, it's little better in block overlap >0.
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