Hi guys!
I stumbled across this article earlier this week:
https://ccrma.stanford.edu/~dtyeh/papers/yeh07_dafx_distortion.pdf
So I though that was somewhat enlightening and I would share the link here.
It is more of a numeric modelisation project, but the approch they used to understand the behaviour of real life analog devices is interesting, me think.
For instance, look at the sine wave signal response they obtain for the Boss DS1 and for the Tube Screamer.
Typically, pieces of information you find on the interweb tell you that the diode arangement of the DS1 is hard clipping, which is often represented with a perfectly truncated sine wave where it hits the voltage limitation of the diodes. They measured the real device through oscilloscope + fourier analysis and what did they found? Both the OP amp and the diodes are distorting the signal, and both these devices do have a different real life behaviour than the typical representation. The resulting wave form is nowhere near what people usually asume for such devices, and the tone setting parts do not explain such behaviour if you model them as pure linear filters.
I don't exactly know if it really fits in there as the electrical behaviour of each component and arrangement is pretty blured in this "block box" approach. But as it deals with stompboxes, I might be in the correct forum to gather your thoughts about "real life" devices vs "how we assume it should work".
Thoughts anyone?
I stumbled across this article earlier this week:
https://ccrma.stanford.edu/~dtyeh/papers/yeh07_dafx_distortion.pdf
So I though that was somewhat enlightening and I would share the link here.
It is more of a numeric modelisation project, but the approch they used to understand the behaviour of real life analog devices is interesting, me think.
For instance, look at the sine wave signal response they obtain for the Boss DS1 and for the Tube Screamer.
Typically, pieces of information you find on the interweb tell you that the diode arangement of the DS1 is hard clipping, which is often represented with a perfectly truncated sine wave where it hits the voltage limitation of the diodes. They measured the real device through oscilloscope + fourier analysis and what did they found? Both the OP amp and the diodes are distorting the signal, and both these devices do have a different real life behaviour than the typical representation. The resulting wave form is nowhere near what people usually asume for such devices, and the tone setting parts do not explain such behaviour if you model them as pure linear filters.
I don't exactly know if it really fits in there as the electrical behaviour of each component and arrangement is pretty blured in this "block box" approach. But as it deals with stompboxes, I might be in the correct forum to gather your thoughts about "real life" devices vs "how we assume it should work".
Thoughts anyone?