Klippel is also doing research on compensating such nonlinearities. Not sure how far along the process they are. But Wolfgang Klippel did express his vision of how the technology would integrate a few years back during a class in Taiwan. I am hoping to do an analog version in a simpler manner for testing. Maybe it could also be done as part of a FIR filter, just need to play around with some things to find out.
I don't know if this is him, looks interesting nonetheless
Professor Brian C. J. Moore, FMedSci, FRS — Department of Psychology
That is the correct person. He did a paper in JAES many years ago on the audibility of group delay. In that paper he mentions the "known" fact that its audibility is SPL dependent. I don't know if that paper has a reference to his claim, but he is one of the authorities in the field.
For the purposes of my claim, drivers are certainly linear enough. As to how audible nonlinearity is, I'll leave that subject to the archives.
Klippel did this back in the 90's. Problem was that it didn't make an audible difference (surprise, surprise!) Hence, it kind of died as a technology.
can you substantiate that claim with evidence?
who undertook the work that shows this to be true?
The Klippel approach (see Ph,D,.Thesis of Hans Schurer at the TU Twente in the Netherlands) is very driver-parameter sensitive. Every woofer has to be measured individually in order to map non-linear parameters (yes, non-linear: that is not a typo) making the work load very heavy, including individual programming of the digital feed-forward compensation.
Commercially hardly doable in this day and age.
Commercially hardly doable in this day and age.
And yet another explanation, when the values are small and the # of things that need to be "just so" increase, its easy to "turn the dials" in the wrong direction.
I have high respect for yor input but I am very difficult person to convince of anything false.
Whats interesting to me is how many times I have experienced this phenom over the years. Many of thos times I was not at all looking to hear what I wanted from it. And on two seperate ocasions on two different systems, when such a "realism" was achieved, someone else not involved and with no idea what was going on, stop what they were doing to voice an opinion consistant with what I believe I was hearing.
I dont claim to know enough to say without question that this was always just a precise FR alignment, but the # of times it has happened seems to argue that those FR details were dicernable and important.
I did a little googling and found a reference to what may be "that paper" in this writing by Linkwitz, in the third paragraph of section D - Room and baffle reflections:
Frontiers
[2] Brian C.J. Moore, "Controversies and mysteries in spatial hearing", Proc. AES 16th International Conf., Rovaniemi, 1999, "Spatial sound reproduction", pp. 249-258
What? Did we just make the jump to radio transmission?
I have never seen this on a scope of say a linear amplifier. Increasing and decreasing the amplitude simply increases the output voltage, nothing more.
Barry.
I don’t recall seeing any published paper on this because his papers on distributed parameters seem to have appeared at a later date.
This is where Klippel measurement technology came in. The idea was to monitor the parameters while the speaker was playing so it would adjust itself. However, possibly it might need a different approach to the compensation. The parameters do not change so often, thus it may not be necessary to use such a processing intensive approach.
You're not doing it fast enough thenOr try it with a very low frequency and vary the amplitude up and down, the trace will no longer be a sine wave, you could make the beam jump all over the place
I’m not buying it.
As long as I dont jump the trace off the screen, it’s still a sign. If the freqency stays the same, the fact that the area of the screen the trace takes up changes with magnatude ie going from a landscape to portrait with increasing magnitude does not change the period or introduce new frequencies.
I’m pretty sure you would have to drive something in the system into harmonic or IM distortion to introduce new frequencies.
Barry.