Stereo Tool
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Stereo Tool 5.02
https://forums.stereotool.com/viewtopic.php?t=2661		 Page 44 of 99
Author:  Luke [ Wed Nov 03, 2010 7:53 pm ]
Post subject:  Re: Stereo Tool 5.02
You have to be carefull about making statements about chipsets.
A lot depends on the design of the motherboards pcb and components after the chip. You can really screw up by adding a low pass filter with a bad design and impedance mismatches which I have seen on alot of motherboards. Phase and audioflatness is gone which results in bad stereo, bad sound, no bass etc.
I'd rather pickup the audio right after the chipset on the motherboard and first put it in a buffer opamp close to it which puts the output impedance to almost 0 Ohm so you have no issues with cable impedance, length and so on.

Camclone, which MB are you using?
Author:  camclone [ Wed Nov 03, 2010 8:37 pm ]
Post subject:  Re: Stereo Tool 5.02
ASUS P5Q-EM with the best chipset for MPX fm/stereo/rds chipset ever!!
... Realtek ALC 1200 !


Anywayzzz, let's get on topic!!

1) Auto restart daemon for stereotool standalone
2) bug with empty buffers ?!
3) SCA outputs
4) DC ( 0 Hz frequencies..) PROTECTION for MPX output in stereotool standalone

for me , after all these 4 " to do " stereotool project finishes!!


p.s.
my Digital Direct Synthesis FM exciter was working excellent but i wanted from sigmacom some extra functions on it's firmware )
Author:  Luke [ Wed Nov 03, 2010 8:56 pm ]
Post subject:  Re: Stereo Tool 5.02
Thx Camclone for the tip.
Looking for a good MB at the moment so that one goes on top of the list.

Did you design the DDS transmitter?
I was trying to build one in the 90's but had to stop due to the lack of a capable synthesis chip.
Author:  Bojcha [ Wed Nov 03, 2010 8:58 pm ]
Post subject:  Re: Stereo Tool 5.02
All P5Q boards from Asus are good (P35 and P45)
Author:  hvz [ Wed Nov 03, 2010 9:21 pm ]
Post subject:  Re: Stereo Tool 5.02
Quote:
btw.. Hans, any news ?
Yeah, that it's difficult :mrgreen:

I have created a list of about 6 characteristics of sounds that may suffer from voice vibrations. And I've written filters to detect each of those. Only if ALL of them are present I lower the bass. This results in a bass level (for this 'mina' track) that's on average 1 dB lower than without these filters, and it sounds MUCH better (and not just for voice vibrations). However, if I lower the input level a bit (by lowering Loudness) the voice vibrations return :evil: :evil: :evil:

Which of course means that my detection method still isn't working properly. And, if it DOES work properly, I can probably also reduce the bass reduction a bit further.
Author:  hvz [ Wed Nov 03, 2010 9:24 pm ]
Post subject:  Re: Stereo Tool 5.02
Quote:
not using ASIO
That probably confirms what I wrote before (and Bojcha's post confirms the same thing): It's probably in the non-ASIO sound card interface.
Quote:
Realtek drivers are ok but stereotool crashes after some days!!
Can you tell more clearly what happens when it crashes? Does it lock up, do you get a popup with an error message, ...???

Most likely, something causes an exception which causes Stereo Tool to crash. OR it could just hang. If the cause is an exception I could just catch exceptions and restart things - but actually I think good software should never crash at all, and hence not need any restarting mechanism... So I want to fix this bug... And for that it would be very useful to know what happens exactly. And if it hangs without an exception this wouldn't even help.

Also: Is your input coming from the same sound card where you send the output to, or are you using different sound cards or something like Virtual Audio Cable? IF you use the same sound card for input and output, how big is your output buffer?
Author:  Bojcha [ Thu Nov 04, 2010 12:09 am ]
Post subject:  Re: Stereo Tool 5.02
Hans, how is possible that this voice and other vibrations, caused by lows, are much less when "non phase linear" is used?
Beside that, bass is much better quality.
I never used "non phase linear" i accidentally clicked and discovered that. :?
Author:  camclone [ Thu Nov 04, 2010 12:28 am ]
Post subject:  Re: Stereo Tool 5.02
Hello again!
I use the same soundcard for imput output and default buffer settings.
Stereotool crashes and then ...silence!! after some days and i get an windows report box.
I didn't keep the report , sorry

please add an auto restart daemon!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!-------!!!!!!!!-!!!!!!!

p.s.
I didnt make any Digital direct synthesis exciter ( sigmacom made it....a friend of mine, ) ( no spurius , no harmonics!!!! yes it can be!
Author:  hvz [ Thu Nov 04, 2010 12:50 am ]
Post subject:  Re: Stereo Tool 5.02
Quote:
Hans, how is possible that this voice and other vibrations, caused by lows, are much less when "non phase linear" is used?
Beside that, bass is much better quality.
I never used "non phase linear" i accidentally clicked and discovered that. :?
Hm, well, 'non phase linear' makes bass sound processing easier for Loudness because it spreads out the different bass frequencies (instead of a single bump the lowest part is moved to the back a bit). This is similar to some bass improvement filter that was posted by someone earlier. I never realized that it would help for voice vibrations also - but actually it might make sense because bass processing is easier. I guess I should make non-phase-linear the default setting???

In the mean time I'm getting closer to a properly functioning voice vibrations filter: I have 2 big parts of the filter, and currently I'm getting -1.7 dB bass when using just one of those, with far less voice vibrations. So I think that filter is ok now, and I just need to fix the 2nd filter as well. (Combining them reduces bass reduction, because I only reduce the bass if BOTH filters indicate that I should do that).
Author:  Bojcha [ Thu Nov 04, 2010 1:19 am ]
Post subject:  Re: Stereo Tool 5.02
Quote:
Quote:
I guess I should make non-phase-linear the default setting???
This is so opposite.. Phase linear should be better quality..
Anyway, in non-phase linear should be fixed that higher bass, so when non-phase linear is selected then some filter to make lower bass (level like in "phase linear") witch is amplified by current non-phase linear.

-----

Hans, you remember bass-beat i send you few months ago, where cliper from multiband caused some pre-artifacts.
Here is another .. this time i can determine what caused almost same thing.
http://www4.zippyshare.com/v/56458114/file.html

And here is the preset, (for testing only)
Attachment:
exp30_2_stream_b39_clip_at_70.rar [2.63 KiB]
Downloaded 217 times
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