I still can't tell what you did from the picture. The latest pictures indicate extreme distress if they are visible on the scope.
Without the resistors to the differential inputs you are just getting increased noise gain (reduced loop gain) in a way that will make most opamps unstable. The resistors allow the opamp to work normally (mostly).
Without the resistors to the differential inputs you are just getting increased noise gain (reduced loop gain) in a way that will make most opamps unstable. The resistors allow the opamp to work normally (mostly).
I intend myself to fine tune the test configuration, and take a closer look at details of implementing this filter.
Else I think I have described well enough what I did (my test procedure), so I got he results to be seen in the pictures.
It will come for sure somebody else with a better testing and maybe some other results... or the same results... We will see.
This test is not meant to be a conclusion about this filtering, or to conclude the discussion here. In my opinion, the last scope snap shots are more controversial than the other ones. It looks quite similar, even though the cap it were soldered in or not... So, to be continued,,,
Else I think I have described well enough what I did (my test procedure), so I got he results to be seen in the pictures.
It will come for sure somebody else with a better testing and maybe some other results... or the same results... We will see.
This test is not meant to be a conclusion about this filtering, or to conclude the discussion here. In my opinion, the last scope snap shots are more controversial than the other ones. It looks quite similar, even though the cap it were soldered in or not... So, to be continued,,,
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Hi Guys
Totally snowed under with work, but I am following... I installed Audacity and was able to generate 16 bit and 24 bit files at any frequency and level, but only at 44.1KHz samplin rate. Does anybody know how to up the sampling rate. If I can generate 1KHz and 'Export' as 24/96 Wave files, that would be great.
Anybody know how to up the sampling rate in 'Exporting' in Audacity.
Cheers, Joe
Totally snowed under with work, but I am following... I installed Audacity and was able to generate 16 bit and 24 bit files at any frequency and level, but only at 44.1KHz samplin rate. Does anybody know how to up the sampling rate. If I can generate 1KHz and 'Export' as 24/96 Wave files, that would be great.
Anybody know how to up the sampling rate in 'Exporting' in Audacity.
Cheers, Joe
Love to have this discussion, but again a bit OT... but do you like this acoustic measurement:
What is amazing is that the Tweeter is reversed phase - but this method relies on lining up the step responses of the driver - read Renegade Tweeter Theory. What is interesting is that the 'offset' (what many call [physical] time alignment) is a lot smaller using this method - the Tweeter's delay is much smaller and hence the physical position of the Tweeter does not need to be as deep.
Cheers, Joe
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Well, probably the kind of "euphonic" distortion you can mix in with an aphex aural exciter, but IMD usually sounds awful.
Joe, in Audacity, probably the simplest way for you is to create the tone, then click the down arrow next to the track name "Audio Track", and at the bottom you have Set Rate. Note, it's possible to go to ridiculously high rates if one wants to, and has the disk space to save it to ...
When Exporting, click Options and make sure Encoding is set to what you want there ...
When Exporting, click Options and make sure Encoding is set to what you want there ...
This trying to see what's going on with 'measuring' is a classic example of how the audio industry is so far from getting a grip on what to test for, when it tries to attach numbers to 'good sound' ...
I have figured it out, made two 1KHz 24 bit files, eight minutes long, one 96K sampling rate and the other 192K, both are Flac files.
I have posted them here where they will be for the next 6 days:
http://www.hightail.com/download/elNJblRwMGtvQnZvS3NUQw
Was rather easy to do. Anybody can do this and generate any frequency and sampling rate. I will certainly be using this and with my Clio - but when time allows, so give me two days...
Cheers, Joe
Agreed, but to some that is not good enough - we have an existing hypothesis that seems to have been challenged and then a 'conservative' element comes into it - preserve previous gains etc.
But correlating what we hear and what we measure, that argument will go on forever.
But when something is verifiable by listening tests and proved to be beyond the 'imagined' or self-decpetion - then of course we want to see if there is something behind it. But whatever we measure, that is still of secondary importance, despite what some may say. Late at night after a long day and I want to hear music, I turn OFF my test equipment and just use my ears.
Cheers, Joe
This is a really paradox. It is not possible to be heard whatsoever distortions with this filter in place. But only the opposite: obvious improvements.😕
Those who have doubts or are against (based on theoretical meanings) this way of filtering, only must experience first the effect of the filter, to know what we (few) are here talking about. Being so easy to implement it a action should be taken, before further exercise their opposition.
If you can give me a link to a place, then I can send you all the files you want. Please make a list and give me a place to send it to.
Adobe Audition is very recommended for such tasks... Or just the good old Cool Edit...
Much appreciated your practical suggestions and procedures for what to be tested for in a device, system, or in this respect here...
I think is a little bit misunderstood the main line of this subject here under discussion.
There is here not about efforts to be added "nice sounds" to a device or another for business reasons in a audio industry. Well, I can agree that the informations here it may be used in a business way... But this is another story.
Some peoples just have found out that adding this kind of filtering on a DAC chip outputs it give a improved sound, and/or a strange positive effect. Then one try to find out more about why this is happen, and came here to talk about. And then expecting one to find some kind of supporting in his task from others people interested too in the same things. But not be pointed out that one/ones as a fool, stupid or a irrational person(s).
This is (it may be) the principle this thread should "work".
While some other people have pointed out that adding that kind of filtering is a well-known and well-understood technique. Some people seem to be unable to understand that.
Good luck with that. At this point I think I am tired of banging my head against the wall. You can lead a horse to water but you clearly can't make him drink.
Enjoy your quest!
Glad you figured out audacity, Joe. Suggest you have a look at SoX too - and then the signals package of gnu octave.
Oh, yes... You have to know only how to do it...😀 I will tell you in a "diyHorse" thread...😉
Not having a go at you at all, Coris, about your efforts here - my point is that the audio industry as a whole has been very poor at devising measuring techniques that are truly effective in producing numbers that match the subjective experience. Personally, my ears are the best tools at my disposal - results count for everything, I'll worry about the 'why' further down the track ...
How did you know - that is just how I feel.
I don't worry about - it has happened to me before. Sigh.
True, I have said the exact same thing before - I am reminded about a play about Einstein, where there was only two characters, one was Young Einstein and the other Old Einstein, talking to each other. You sound like young Einstein. 😀😀😀
Old Einstein: "Do you suppose it would be possible to distill the Beethoven's 9th symphony into a purely scientific analysis of numbers and figures?"
Young Einstein: "Of course."
Old Einstein: "Yes, it may be, but would it enhance the experience of listening to it?"
The message of an old man was that the 'experience' trumped any scientific experiment.
But it won't stop science from trying.
But I suspect it is not science that is the problem here, but skepticism.
Get your soldering iron out... and put the experience first.
Then skepticism will no longer be a barrier - so far I have counted nearly fourty who have heard it - and it won't go away.
Cheers, Joe
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