[wdmaudiodev] Re: AW: Re: Loop back AGC in renderer audio path?

  • From: "Jacob Martin Riiser (JMRI)" <jmri@xxxxxxxxxxx>
  • To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 26 Feb 2019 11:05:56 +0000

Any info on the limiter in the audio path:

  *   Is it documented somewhere?
  *   Can it be configured (time constants etc.)?
  *   Other useful hints?

Thank,
Jacob

Best regards / Med venlig hilsen

Jacob Riiser (JMRI)
Sennheiser Communications A/S
Direct                  +45 5618 0004

From: wdmaudiodev-bounce@xxxxxxxxxxxxx <wdmaudiodev-bounce@xxxxxxxxxxxxx> On 
Behalf Of Matthew van Eerde
Sent: 22. februar 2019 16:52
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: AW: Re: Loop back AGC in renderer audio path?

There is indeed a limiter, but it is well after the SFX. The input to the SFX 
is not modified.

________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on 
behalf of Johannes Freyberger 
<jfreyberger@xxxxxxxxxxxxxxxxxxxx<mailto:jfreyberger@xxxxxxxxxxxxxxxxxxxx>>
Sent: Friday, February 22, 2019 3:55:13 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] AW: Re: Loop back AGC in renderer audio path?

Couldn't it be he stumbled across the limiter inside the windows audio mixer?

Von: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> Im 
Auftrag von Matthew van Eerde (Redacted sender "Matthew.van.Eerde" for DMARC)
Gesendet: Donnerstag, 21. Februar 2019 23:14
An: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Betreff: [wdmaudiodev] Re: Loop back AGC in renderer audio path?

Windows does not do such a thing as you describe; what gave you that impression?

________________________________
From: wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx
<wdmaudiodev-bounce@xxxxxxxxxxxxx<mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx>> on 
behalf of Jacob Martin Riiser (JMRI) <jmri@xxxxxxxxxxx<mailto:jmri@xxxxxxxxxxx>>
Sent: Tuesday, February 19, 2019 7:51:35 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Loop back AGC in renderer audio path?

Hi,

While developing an SFX APO (renderer), I have encountered some problems 
causing my output to exceed legal range - this is being addressed.
However, while looking into this, I got the impression that Windows (I presume) 
monitors the output level of the APO, and is able to apply AGC-like 
functionality by adjusting the input gain to the APO.

I would really like some info on this functionality, including:

  *   How does this work?
  *   Are time constants described somewhere?
  *   Can it be tuned or adjusted in any way?

Best regards / Med venlig hilsen

Jacob Riiser (JMRI)
DSP Engineer

Sennheiser Communications A/S
Industriparken 27
2750 Ballerup
Direct                  +45 5618 0004
Mail                     jmri@xxxxxxxxxxx<mailto:jmri@xxxxxxxxxxx>
Web                    
www.senncom.com<https://nam06.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.senncom.com&data=02%7C01%7Cmatthew.van.eerde%40microsoft.com%7Ccf6e60a331334a239ac508d698bcad0c%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636864333487099148&sdata=5aH4vw2HIS8LkN%2FSeAIJsLZWPKnOubsomC6klgn%2FyxU%3D&reserved=0>

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