Symmetric phase response of an IIR allpass.

robert bristow-johnson wrote:

...
> can't have it any
> other way except to have a filter that has imaginary output (as well as
> real output).

You snipped the part where I say that this filter has a complex impulse
response.

Andor wrote:
>
> You snipped the part where I say that this filter has a complex impulse
> response.

so you're correct.  i missed it and did clip it.

r b-j