Let's stick to audio please, you keep saying music isn't made up of sine waves, prove it, don't waste your time, you can't.
The nonlinear physics of musical instruments - IOPscience
I have already posted this in a previous post.
Nonlinear system - Wikipedia
You keep on mentioning FFT. If you don´t want to use infinity or an for us pretty good aproximation of say 100 THz then please don´t keep mentioning FFT.
From:
Square wave - Wikipedia
I prefer to use the more generic and more useful "nonlinear signal" instead. It is you who keep on taking this discussion into unreasonable extremes like FFT (where infinite bandwidth is needed for the linearization of an nonlinear signal).
I have already posted this in a previous post.
Nonlinear system - Wikipedia
You keep on mentioning FFT. If you don´t want to use infinity or an for us pretty good aproximation of say 100 THz then please don´t keep mentioning FFT.
From:
Square wave - Wikipedia
I prefer to use the more generic and more useful "nonlinear signal" instead. It is you who keep on taking this discussion into unreasonable extremes like FFT (where infinite bandwidth is needed for the linearization of an nonlinear signal).
Why is not Fourier Transform Good for Non-linear Processes - Signal Processing Stack Exchange
Something easy to read and understand.
Something easy to read and understand.
You have noticed this paper is about real Engineering not audio?
Who were you aiming this at? And it is clear although Joel attended two universities he doesn't appear to have graduated from either. Not holding that against him but he's no academic.
No. Audio is bandwidth-limited.
Do you understand the Nyquist criterium?
BTW, so far you have proven that you are adept at Googling anything with 'FFT' in the title. There is no indication you understand those papers, or whether you have even tried to read them. Which is unlikely anyway with the speed you throw them up. So more smokescreens. Neat.
Jan
Last edited:
https://royalsocietypublishing.org/doi/10.1098/rspa.2016.0871
More great reading.
True enough! There is to much old dogmas in audio for it to be called "real engineering"..
More great reading.
True enough! There is to much old dogmas in audio for it to be called "real engineering"..
I am not an expert at LTSpice. I only have a very superficial understanding of how it works. So please go ahead and tell me everything I have failed miserably at in a condesending manner. It is easier then testing it yourself on your own computer or pointing it out in way that I could actually learn something from.
Here I have run a 500 Hz square wave through a 12 dB/octave 500 Hz LP filter.
There are harmonics way above the noise floor all the way up to 20 Khz - even though it is low pass filtered. A 500 Hz sinewave does not show any harmonics above the fundamental as expected.
I have no idea. Please tell me since it is you that mentioned this here.
Can't see anything wrong with this. Of course you see the square wave harmonics above 500Hz because your filter is 12dB/octave, so that is the rate they diminish with rising frequency.
Edit, for those grappling with the duality of time and frequency domain, maybe this pic from Guido Tent may clarify.
Jan
Attachments
Last edited:
When my colleagues start telling me about the distortions of the first period in the simulator, I immediately understand that this colleague has no idea how the simulator works, in particular Microcap. For information: the program counts according to the last period from the burst that we set for analysis. If we set a burst of five periods, then the program will make a test for the 5th period by substituting it multiple times in front and behind so that the signal turns into a periodic one. The program does not pay attention to the phase of the signal, it is important that the period is whole. That's all you need to understand. The program works in the same way for the first period.
Attachments
Jan, you are again avoiding a specific answer. Instead of giving a link to your publication of this amplifier for acquaintance with "how to do", you chatter a request. If this is a commercial development and is not subject to disclosure, say so.
I thought you had that info already.
LMGTFY:
Winfield Hill's 100W, 10MHz, 1000V/uS AMP-70 | Linear Audio NL
Jan
LMGTFY:
Winfield Hill's 100W, 10MHz, 1000V/uS AMP-70 | Linear Audio NL
Jan
I don't think that is correct. It doesn't substitute anything. If it did, you could never see the evolution of a signal over time.
Jan