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Wave shape

Posted by John Sheerin on August 25, 2003 at 11:18:29:
Just for fun, here are two plots I did about 6 months ago. The first is a 200hz square wave passed through a system with a constant delay. The ringing is from the finite bandwidth.
This next one is a 200hz square wave with a different phase response - not a constant Nx -90, but actually representative of a real speaker.
I'm not sure why you keep bringing up things like the RIAA curve as that is a different situation, and you're right - as a system, it should pass a waveshape correctly. Its phase should be related to its magnitude response, so when you apply the inverse filter, everything is back to a linear system. However, a speaker with flat response but phase response that is not flat (and is not simply a result of a constant time delay) does not behave like this, at least in such a simple manner. Of course you can use DSP and make it all work nicely.
John