How would GDelay of a brickwall filter for CD affect the tests for audibility here? Or even JN's tests?
THx-RNMarsh
THx-RNMarsh
I usually have an opinion formed before I ask the question. I just like to see if others come to same conclusions as I have.... thru thier own mental processes. Some times, I do a little steering via questions.
I dont care to dance any more with several different person's processes to reach a conclusion.
THx-RNMarsh
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There are significant differences between work and here.
At work, they have people who are the best in the world. Nature of the beast. They listen to what others have to say, they never tell someone that they don't know what they speak of, even if it is true. They listen.
I live my life that way. Everybody I work with is listened to, I will have it no other way.
Here, that doesn't happen. I had hoped it would, but remain dissapointed.
I do not know what your issue is, and it makes no difference. I listen to others, be they "subjectivist", "objectivist", I do not care.
I told you back a while, I do not care about audibility because you were trying to categorize me.
I care about it all.
Most of all, I want the younguns to learn. That said, are you setting a good example???
I try, I would hope all do...life is too short to do otherwise.
Jn
Ps.. I guess I could have said..while you have not understood the concepts I present, I believe you are an exceptionally brilliant individual I respect and hope to continue dialogue with as you figure out where I am going with this dialogue..however, I am sure he already knows how I feel.
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First and foremost...
You accuse me of setting up a red herring???
I rue the day I considered you a friend. Given what you know of me, you have the nerve to even thing that???
Ok, had my fun...😀
The confusion stems from somebody using raised sine modulation to prove..something. The problem is, the resultant carrier really screws up the time domain plots. After filtering, the carrier mixes with the LSB and the time domain shows stuff that in reality doesn't exist. That is why I detailed the 20/4 in 18/2 out.
I kept pointing out the frequency disparity, and it ended up "frequency shift" stuff. The point I've been making is, the frequency shift stuff is due to raised sine modulation....something which does not exist in nature.
KSTR has it right. I am grateful he stayed with it...
Jn
Ps.. I hope all is well with you and family.
Pps. If the time domain plot doesn't feel right..don't ignore it. Figure it out..
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You and I differ in one aspect. I already know the answer before I ask the question.
Well, at least I have been accused of that at work...
Jn
I used to just give the bottom line. But that just created all sorts of misery. So, now I just ask the question and let others argue my case for me 🙂
Other times, I dont know for sure and ask a question. Either way, it's all good.
Thx-RNMarsh
If a filter is FIR then the impulse response is finite and goes to zero and stays there. This is like the second filter in your post. If it is IIR the impule response extends towards infinity like the first image in your post.
THx-RNMarsh
matlab - How can I detect if a filter is FIR or IIR according to impulse response graph? - Signal Processing Stack Exchange
IIR vs FIR | AudioSEX - Professional Audio Forum
THx-RNMarsh
matlab - How can I detect if a filter is FIR or IIR according to impulse response graph? - Signal Processing Stack Exchange
IIR vs FIR | AudioSEX - Professional Audio Forum
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I'm going to tell you anyway, I don't expect it to make a difference. Perhaps it is a cultural thing, I don't care, but I find your general tone too combative for my taste, it depresses me, also I find it manipulative. Richard seems to be halfway to a better approach, still too manipulative though in my book, I've seen it too many times, it looks like control.
It's sad, but I have to agree with you, scottjoplin. I haven't seen that level of inflated self perception for a long time.
Yes - the risk is that one executes "management by fear". Everybody agrees. Seemingly. This is something everyone needs to be cautious of once one end up in a leading position.
KSTR - some great, clear, short & to the point posts - thanks!
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KSTR - some great, clear, short & to the point posts - thanks!
//
Thank you,
Nice review.
A number of people could hear the difference in sound between different Brick Wall filters when going from 96K to 44.1K.
It would be nice to see a comparable test of more recent date, because this one was from more than 20 years ago.
If DAC development followed Moore's Law, then we could expect an increase in processing power of 2^10 or a factor 1000.
So maybe the current generation of DACs have improved their processing accuracy quite a bit.
One thing is obvious, filters do play an important role in sound perception.
Afair, Bonsai mentioned some time ago that he had made a very long and accurate FIR filter for a customer, where the customers reaction was that for the first time he could hear things to his satisfaction.
Hans
xtly! That is why slowing down C by using a heavy gas is a bad idea, since it makes the enclosure look larger for standing waves 🙂
Looking at the image below that I "stole" from Richard, I'm not so worried about the "headroom", since most of us above 30yrs are already 60dB down at 17Khz.
So the Gibbs ripples generated >20Khz or lost HF Cymbal frequencies are seemingly harmless when talking of frequencies only.
Theoretically that would be possible when our ears were able to process sound in such a non linear way that we could demodulate envelopes.
Problem however seems that with sound strictly above 20Khz, no matter what envelope or frequency content, we cannot perceive this.
It seems hard to understand how a demodulator could only work in the presence of LF sound.
So for the time being there is no prove for an envelope sensitivity.
At the same time, there are differences in sound reproduction between cables, where simple L,C and R models do not (yet) explain these differences.
So there still seems a way to go.
Hans
Not everything that can be measured makes sense
Not everything that makes sense can be measured
(Einstein)
