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SMCFY / SMC-WDF

A Real-Time Wave Digital Filter Library for Matlab
MIT License
21 stars 2 forks source link

Tube model wrong output #1

Open Bk8 opened 5 years ago

Bk8 commented 5 years ago

I was reading the paper: Wave Digital Simulation of a Vacuum-Tube Amplifier recreated in the TubeModel.m and something is wrong or missing, the model it is not behaving like a tube. Since Vg = 20 is constant the tube is always saturated, and is not posible to recreate Fig. 5 in the paper where saturation is a directly related to the amplitude. Also the implementation is weird, since the signal is feeded from a constant voltage source.

NikolajAndersson commented 5 years ago

Yes, I remember the response not being correct and behaving weird. Feel free to update it and make a pull request.

kevontheweb commented 1 year ago

@Bk8 did you ever solve this? I'm trying to reimplement this in python and have the same issue.

Bk8 commented 1 year ago

@kevin-nel No, I was not able to fix it. There are a couple of errors, not even the Newton-Raphson solver is correctly implemented. Maybe if you have a public repo of the Python implementation I could take a look again at it.