HOLMImpulse: Measuring Frequency- & Impulse-Response - Page 22 - diyAudio
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Old 26th June 2009, 01:18 PM   #211
gedlee is offline gedlee  United States
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Default Re: Levels and more

Quote:
Originally posted by askbojesen
[B]

I'll keep it this way, I set the impulses to the maximum possible length, that is available

I simply don't understand why this can't be an option? If the user doesn't change these settings then they always get the maximum, if they do then they always get what they set it to. How does this compromise anything?

I am aware of the parts of the program that you show, but they don't help really. I think that the software may not be working with the windows mixer in the way that you think or not in my system. I do not seem to be able to turn down the output signal with the mixer. All I can say is that setting levels is really confusiong. It may be an odd part of my system - Vista 64 or sound card, but the input levels cannot be changed in the mixer because the software overrides it every time. You have to exit the software, change the input level and then strta the software again because it will only use the level set when the software starts. It resets it back to this level at every run. This may not be your program as I run two measurement systems at the same time.
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Old 26th June 2009, 02:17 PM   #212
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Default Mixer Levels

Quote:
Originally posted by gedlee
I think that the software may not be working with the windows mixer in the way that you think or not in my system. I do not seem to be able to turn down the output signal with the mixer. All I can say is that setting levels is really confusiong. It may be an odd part of my system - Vista 64 or sound card, but the input levels cannot be changed in the mixer because the software overrides it every time. You have to exit the software, change the input level and then strta the software again because it will only use the level set when the software starts. It resets it back to this level at every run. This may not be your program as I run two measurement systems at the same time.
Output level
HOLMImpulse does not alter the mixer. In Windows Vista you can adjust output levels for individual applications and master. In Windows XP you can adjust master and PCM.
If your other applications adjust the mixer settings (Like audiotester does) while you are measuring, then I also get confused - why I have not included windows mixers.

Input level
The PCM wave I record is also given by the windows mixer level

I have tested this in windows XP and Vista - In Vista you might want to check the keep-stream alive box + restart - this way you will have the HOLMImpulse application in your Vista mixer before measuring.

No mixing in HOLMImpulse
Because of OS dependencies and other trouble I'll not implement mixer control in HOLMImpulse - I will leave all the control to you and your OS. Like audacity (http://audacity.sourceforge.net/) does not alter the mixer settings.
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Old 26th June 2009, 02:23 PM   #213
JohnPM is offline JohnPM  United Kingdom
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Default Re: Mixer Levels

Quote:
Originally posted by askbojesen
HOLMImpulse does not alter the mixer. In Windows Vista you can adjust output levels for individual applications and master. In Windows XP you can adjust master and PCM.
If your other applications adjust the mixer settings (Like audiotester does) while you are measuring, then I also get confused - why I have not included windows mixers.
You don't need to get involved with the Windows mixer - just don't generate the sweep at 0dB FS, why not allow the sweep to be generated at lower levels within HolmImpulse?
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Old 26th June 2009, 02:32 PM   #214
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Default Output & Input mixerlevels

HOLMImpulse Output software level 0-1 amplitude makes sense - My software mixer cannot be any worse than the Windows software mixer... I'll implement easily.

HOLMImpulse Input software level does not make sense
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Old 26th June 2009, 02:39 PM   #215
Pano is offline Pano  United States
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I agree - keep away from the windoze mixer. But having a lower level signal might be a good idea, as John says. Some cards don't do well with 0dBFS.* Being able to set a precise level in HOLM would be nice. E.G. -3dB

It's all working fine for me - but every setup is different.



* Have a look at this clipping test.
http://www.hydrogenaudio.org/forums/...showtopic=9772
It's in APE format. If you can't use it, let me know - I have it in FLAC and wave.
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Old 26th June 2009, 03:13 PM   #216
gedlee is offline gedlee  United States
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Ask

It could well be that my confusion is with the new way that Vista works with the mixer. I have never liked the Windows mixer, but it seems like on my system I can't avoid it. I have to use it and its hard to configure with different software when one of them doesn't have any settings. Then everything has to be set to HOLMimpulse. I thing the variable output level is a necessity - thanks.

Again - why can't the output samples for the impulse response be set as an option?
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Old 26th June 2009, 03:30 PM   #217
a.wayne is offline a.wayne  United States
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Quote:
Originally posted by domtw
I think it is an excellent way that the software development is going together with users' feedback.
In a while, it will be a great piece of software.
Thanks again!

+10
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Old 26th June 2009, 08:55 PM   #218
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What defines the resolution of the impulse response?

Would it be possible to have the IR be a very high number of points/sec combined with a long sweep to get greater detail? Mainly when doing CSD.
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Old 26th June 2009, 10:52 PM   #219
Theo404 is offline Theo404  United Kingdom
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Default Using wav files

Many thanks for the excellent free program!

This may sound like a stupid question, but is there anyway that it could except plain old wave files and analyse them? I run a linux based crossover/playback system and it would be nice to test the whole system running, which would require the playback and recording to be separate.... Ie playing a generated sweep wav on the system and recording with a windows machine (either directly into the program, or into a wav file).... I know this is possible using aurora plugins with cooledit/audition, but its never worked that well for me.
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Old 26th June 2009, 11:04 PM   #220
Key is offline Key  United States
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Quote:
Originally posted by gedlee
Ask

It could well be that my confusion is with the new way that Vista works with the mixer. I have never liked the Windows mixer, but it seems like on my system I can't avoid it. I have to use it and its hard to configure with different software when one of them doesn't have any settings. Then everything has to be set to HOLMimpulse. I thing the variable output level is a necessity - thanks.
I second the variable output/input testing if it is feasable - some recording engineers hit the meters no more that -6.02 dB as they think the ADCs perform better at this volume.

But I would recommend if your card doesn't have ASIO drivers to use ASIO4ALL instead of microsofts drivers. http://www.asio4all.com/

I for sure would not use XP's directsound and I am very skeptical of Vista's WASAPI platform.
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