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The ASR "objectivists tribe" ;) has to read the Keynotes at the AES160th by Lars Risbo

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Needless to say, the current state of the audio community is not particularly satisfying for these kinds of engineers and companies.
Well, they did come to me for the launch of Purifi amplifiers. They have not been so forthcoming for their drivers/speaker work however.

I am very willing to enhance my speaker testing to better detect audible impairments. In every sweep I perform on speakers, I clearly hear distortions that don't jump out at you when you see the measurements. I would love to work with them to perform specialized testing in this regard.
 
On a minor note, I understand Amir’s keen interest in LLM AI tools but I’m disappointed to see him deploy a bunch of verbose Chat-GPT slop as part of his response above, a poor choice which for me puts a chink in his leadership and seriousness as this crucial debate unfolds.
What are you talking about? I made no argument or debate as to need AI's help. Folks had asked for a summary of the article so I asked ChatGPT to create one: "Anyway, I asked ChatGPT Pro with thinking model to summarize it. It didn't do a great job but here it is anyway if you want to get an idea. "

Nothing about what it produced was slop and I said the summary was not great as I have bolded above. It simply truncated the text some. You can do better than AI? Be my guest in posting a summary.
 
But can we acknowledge that the keynote is far more damaging and challenging and contemptuous toward the subjectivist “tribe”
It's like we read completely different addresses. At best he obliquly and briefly mentioned subjectivists. he said nothing damaging or challenging about them.
 
If I was Microsoft, I sure as hell ain't sharing nothing, these physicists can cry their heart out as far as I care. So maybe Purifi figured something out? Just giving Lars the benefit of doubt
You’re still missing the point. To sell even one of those computers it must actually work. In computer science, this is a prerequisite. In audio, not so much.
 
Are you nitpicking that he doesn't say something like: the k-th harmonic is equivalent to a time-translated copy of the exponential sweep? And used the common time shifted copy as a brief explanation? Since neither time nor phase shift is entirely correct how would you word it?
The point he is trying to make is, that difficult strict time or frequency-domain problems can easily be detected by cleverly using none linear high time resolution (time of arrival) methods alongside with a transformation.

I am not nitpicking at all.
He speaks about listening by ear and masking of signals. And that the harmonics a driver/loudspeaker produces during a sweep will somehow arrive at the ear at different times, escaping the masking of simultaneous signals by the ear.
So, it seems to me, we are talking about a physical process and not a mathematical transformation that can be used on the data from the measurement process.
EDIT: And we are not talking about milliseconds of time shift as this will not change anything in respect to masking during a sweep.

I am looking for a much more pedestrian explanation than to reference “difficult strict time or frequency-domain problems“ and “none linear high time resolution (time of arrival) methods“, whatever is meant by that.

Exponential sine sweep - frequency multiplication becomes "time translated shifts".

Cochlea - frequency content becomes place coding along the membrane.
I kind of understand that, but in the ear there is no time translation happening, correct?
And the signal and distortion (fundamental+2nd harmonic+3rd harmonic+...) arrive in the cochlea at the same time and masking takes place, or does it not? What am I not getting?

And here is the quote again:
The harmonics of the sweep arrive at the listener’s ear at different times.
Temporally separated like that, people routinely detect distortion products even at minus 80 decibels. By ear and without effort.
I start repeating myself.
I just don't understand his point (and your explanations).
 
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I think Lars is one of the good guys. I'm just disappointed in this keynote. The desire to create click bait controversy and promote Purifi undermines his admonition that we need more science and engineering. he could have used the pulpit better.
 
it’s how an ESS sweep works by design: the second harmonic arrives at a fixed time offset before the fundamental. This is how we measure the harmonics by using this time separation. It’s now the industry standard method. Popularised by Farina.
 
When trying to explain something whose existence is strongly contested AND has not been quantified or proven in any way, you simply can't analogize with something whose existence is universally accepted AND is easily quantified and proven.

Like you can’t describe a claim or possible phenomenon, including with analogies, if its existence has yet to be proven….????

That’s like a doctor saying to a patient describing their perception:
You can’t say ‘burning pain’ unless we’ve proven the tissue damage mechanism.”

Or: if you’re claiming there are aliens held at Roswell, you can’t describe anything about their form as physically analogous to humans. “That’s just invalid because you can’t use an analogy to something we know exists - human bodies - to describe something that has not been proven yet!”

Or we can’t describe the concept of Artificial General Intelligence, and certainly with no analogy to human intelligence, before we’ve demonstrated it already exists!

But of course you can. You can describe human-like aliens and then say “ now that we’ve described what we’re looking for, let’s go look for them.”

You can describe artificial intelligence, and especially artificial general intelligence, using analogies to human intelligence, in order to have some idea what you’re aiming to develop. And defining the proposed phenomenon allows you to look for evidence for when it might exist.

Likewise if a company’s gonna claim some form of distortion they are reducing, it’s perfectly valid for them to try to describe the perceptual nature of that distortion in the first place, so it can be tested for. (Eg in controlled listening tests). And if analogies help in defining that distortion, fine,
That’s human language at work!

It's like making claims about the strength and speed of Bigfoot by extrapolating the strength and speed of primates that have been empirically quantified.

But that’s perfectly valid! Certainly in the sense I have been using descriptions/analogies. You don’t have to even assume a phenomenon is real before you provide a description.

Making claims about the character of a PROPOSED phenomenon, before or whether we know that phenomenon exists, is entirely reasonable. It’s done all the time in science and elsewhere. You describe the character of some proposed phenomenon and then you can go looking for it, if there is motivation to do so.

Applied to describing Bigfoot, your logic is like saying:

You can’t appeal to animals we know exist to help describe a creature proposed to exist. So you can’t describe an “ape-like” creature roaming forests in the Pacific Northwest, or use any analogy to ape or human forms or locomotion to describe Bigfoot, unless we already have determined that Bigfoot exists.

Can you see the problem here? (“Uh… what are we looking for again?…”)
 
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It's like we read completely different addresses. At best he obliquly and briefly mentioned subjectivists. he said nothing damaging or challenging about them.
the reviewer quote in the opening said it all. Quite damaging I think. You are looking for fairness by how many words used?
 
the reviewer quote in the opening said it all. Quite damaging I think. You are looking for fairness by how many words used?
Yes I seriously think it lacked balance, despite some opening words.
 
Plese don't take AES Keynote lectures too seriousy. They are not scientific reports/papers, but just kind of spiritual uplifting rituals at opening seremonies. The speaker is in practise supposed to express personal preferences and issues that (s)he is questioning against dogma. And Risbo spoke as CEO of Purifi.

 
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It creates an environment that is not particularly friendly to innovation. For example, Purifi has delivered genuine audio innovations, as have many other audio companies that tend to fly under the radar in this regard. Why are so many of these companies under the radar?
Protecting intellectual property so certain companies can't copy the ideas and market them ?
Because they do not want to fight a battle with the "objectivist tribe",
Nah, if they are true innovations and lead to provable better results there will be no objectivist tribe objecting to it.
reveal their innovations to competitors in the process,
ding ding ding
and lose anyway, since many of you are unwilling to buy a slightly better product if it costs much more due to the research and development behind it.
That's mere speculation on your part I reckon.
As a result, these companies often blend in with the "subjectivist tribe" to some extent and try to convince people through the perceived sound quality of their products instead.
O.K. so you created something and ONLY appeal to the objective tribe ... isn't that asking for loosing the biggest tribe with the most money to spare on this hobby (the subjectivist tribe) ?
Of coarse there has to be some appeal to subjectivists in the marketing material. They would be utterly stupid not to do so as they would loose income.
It is a business after all.
Needless to say, the current state of the audio community is not particularly satisfying for these kinds of engineers and companies.
That depends on their marketing.
 
It's valid if you are writing fiction, perhaps on a site like "Audio Fiction Review dot com"
In fairness, there is no real primary science being done here either.
 
it’s how an ESS sweep works by design: the second harmonic arrives at a fixed time offset before the fundamental. This is how we measure the harmonics by using this time separation. It’s now the industry standard method. Popularised by Farina.
The time separation occurs due to nature of the test signal. It is not at all how distortion gets created otherwise, i.e. with music. And at any rate, distortion shows up as "negative time" (prior to linear impulse) which naturally does not exist.
 
"I have in my hand a list of ground-breaking research that overturns the models you 'objectivists' use to understand audio equipment. What's that? No you can't see it. It's proprietary. Anyway, I'm extremely disappointed with the 'objectivist' crew because they aren't publishing lots of research."

I can't imagine loudly making this point with a straight face. It's verges on parody.
 
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