Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › THD measurement wheeze
New Posts  All Forums:Forum Nav:

THD measurement wheeze - Page 2

post #16 of 23
Quote:

Originally Posted by wakibaki View Post

 

Yes, but the point is that if you want to employ more than one program, 2 programs can't conveniently share the inputs and outputs of the same soundcard. You're free to use RMAA, I have, but I want another string to my bow. Besides, electronics is fun.

 

It is possible to use the input and output of the same sound card separately from two programs as if they were on two separate sound cards, at least it definitely is on Linux and the versions of Windows I tried. The sample rate and resolution do not need to be the same, either. Using the same sound card for both playback and recording also has the advantage of no synchronization issues due to a slight mismatch in the clock frequency of the ADC and DAC. But you need to watch out for grounding issues that can make the results incorrect (this also applies to two sound cards in the same PC).

 

In this thread, there is some discussion of sound card based measurements that might be relevant.

post #17 of 23
Thread Starter 
Quote:
Originally Posted by stv014 View Post

 

It is possible to use the input and output of the same sound card separately from two programs as if they were on two separate sound cards, at least it definitely is on Linux and the versions of Windows I tried. The sample rate and resolution do not need to be the same, either. Using the same sound card for both playback and recording also has the advantage of no synchronization issues due to a slight mismatch in the clock frequency of the ADC and DAC. But you need to watch out for grounding issues that can make the results incorrect (this also applies to two sound cards in the same PC).

 

In this thread, there is some discussion of sound card based measurements that might be relevant.

 

OK, thanks, that's all good to know. Interesting stuff in that thread. I'm hoping to use the soundcard in conjunction with a USB scope, but it's an experiment and I'm keeping my options open as regards using the soundcard as an input. I haven't got very far yet, wasted a load of time arguing with tangent. Now I've got some amp boards back from the fab that I have to work on.

 

w

post #18 of 23
Quote:
Originally Posted by wakibaki View Post

I haven't got very far yet, wasted a load of time arguing with tangent.

?!?!? Really?

I found the discourse was (mostly) civil and quite informative.

I'd say ease up a bit and appreciate the perspective. After all, you invited it upon yourself.

wink.gif
post #19 of 23
Thread Starter 
Quote:
Originally Posted by jdkJake View Post


?!?!? Really?
I found the discourse was (mostly) civil and quite informative.
I'd say ease up a bit and appreciate the perspective. After all, you invited it upon yourself.
wink.gif

 

What? You read what I wrote and you thought, 'There's a guy I could have an argument with.'

 

Puh-leeze.

 

w

 

biggrin.gif

post #20 of 23

w - In your rush to alienate others on this forum, e.g.

http://www.head-fi.org/t/589972/help-choosing-project/45#post_8085535

You may want to reconsider doing so for guys like Tangent & jdkJake.  I somehow doubt you will, perhaps you're content with the few here you've made connections with. 

Tangent's contributions to this hobby & community over many years are well-established & well-respected.  Did you even bother to take a look at his website & its wealth of information?

 

Quote:
Originally Posted by wakibaki View PostWhat? You read what I wrote and you thought, 'There's a guy I could have an argument with.'
post #21 of 23
Thread Starter 

I appreciate that tangent is not without his virtues, but IMO, his intent in posting here was not to contribute usefully to my investigations, but rather to advance his reputation at my expense.

 

If you confine yourself , cfcubed, to making useful contributions regarding the proposal in the OP, you will find that you will get a cordial response even where disagreeing with me,  as stv014 did.

 

w

post #22 of 23

Yep, you nailed it, wakibaki. There's clearly no possibility I was just trying to help. That doesn't fit my profile at all.

 

Good thing I wasn't trying to help. If I were, the reception my attempt received here might have convinced me not to try it again with you. But I clearly wasn't, so that's okay.

post #23 of 23

I read all the posts between you both  with a sense of "deja vous"

Where had I heard these philosophical audio arguments before.and then the "penny dropped"

D.Self-V-John Lindsay Hood-circa-1985-1995 in the pages of Electronics World.

John wasnt doing all the "pushing" though.

Audio being what it is many dont know how much VERY heated arguments  arise between ADEs on basic design and inovation

They hold either to the scientific [D.Self] or Subjectivism [JLH]. I have listened to both sides but came strongly out on JLHs side. -Why because I built all his designs and they all performed as he said .Using subjectivism as a guide.

You both must know that the word subjectivism is not allowed in the "hallowed" quarters of EE. Many have fallen at the wayside just for using those words and given the "black-Spot" as in "Treasure Island"-[the film]

The problem is as I posted elsewhere-All human life-birds-bees-fish-mammals-that can hear and make a sound listen Subjectively and nothing will change that thats why some [like myself] can tell the difference in Hi-Fi audio amps -power or headphone variety if BOTH are listened to by headphones .When I put this in a letter to EW nobody said your wrong.
 

New Posts  All Forums:Forum Nav:
  Return Home
Head-Fi.org › Forums › Misc.-Category Forums › DIY (Do-It-Yourself) Discussions › THD measurement wheeze