I don't know yet but I understand your point. 🙂
Not possible of course with unknown input.
Agreed.
Been there and done that.
Please see post 6 on this thread.
The point being that a reproduction system with even order distortion will reproduce an asymmetrical signal differently due to the distortion. Even order distortion is common in loudspeakers and tubed amps, for example.
Therefore, in congruence with what you said, you have to be sure that your reproduction chain is clean enough. One time we did this, we used a pair of Quad 53s driven by a very clean SS amp.
Interestingly enough, lots of even order harmonics - essentially nothing but.
Virtually every musical sound is asymmetrical. What makes these different?
As I said before, I've tried many people with musical sounds, and while they can hear the difference with the synthetic sound, real world musical sounds are a different matter.
I've had people who said that a certain recording would do the job. Random guessing.
IME several synthetic sounds including that one are a 16/16 correct DBT every time for just about everybody.
Trivial and blinding obvious to you but interesting to me. Thanks for the insult. Sorry to bother you and the other experts here.
I certainly didn't claim the app could listen to music and determine polarity/phase from that.
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No insult intended. Perhaps you should have made it clearer that the app sees both the input and output signals, so it is not claiming to do the impossible.
It is hard to interpret words like "duh, trivial, blindingly and obviously" another way. But maybe I'm sensitive. I thought I made it clear in the original post. Using one device to send the signal and another to interpret that signal. I'll attempt to be more clear in the future.
Read it, a bit sloppy, thanks for pointing it out.
Yes, which makes it a bit amusing whn people brag about their highly resolved stereo.. Many times it's probably a testament to shitty gear!! 🙂
Guess it's a matter of degrees and where the bulk of the energy are frequency wise. Perhaps dynamics play a role as well.
Exactly.
Coming full circle - you need the app because any piece of audio gear, even sometimes just a cable, can flip a signal's polarity.
Flip one channel and not the rest, and you've got trouble!
^^The FREE application gives you the known signal and a measuring instrument. How can you fault something that works and is simple, foolproof and FREE ? Oh wtf. I'm out.
arnyk answered but I'll add some..
Most measurements are about feeding a signal into a DUT and compare that signal to what comes out on the other side.
The interesting thing is the difference between input and ouptut, that is the "error" or the charactreistics of the DUT.
If you read my post to which you responded carefully you'll see that I wrote that the input signal was known... not the output.. 😉
Build a diode clipper - just a series resistor, say 2K2, followed by a parallel connected diode.
Feed a 1kHz +4dBu sine wave in and observe the output waveform on an oscilloscope, the sine wave will have the top clipped off, creating a simple asymmetric test signal.
Feeding this into any audio unit will instantly indicate whether the unit inverts polarity, or phase.
Feed a 1kHz +4dBu sine wave in and observe the output waveform on an oscilloscope, the sine wave will have the top clipped off, creating a simple asymmetric test signal.
Feeding this into any audio unit will instantly indicate whether the unit inverts polarity, or phase.
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