AW: VC Phaser using the LM13600

[Florian Anwander]

Hello Juergen

>it is when you build delay units like phasers.)
I am not the hero of electronic theory, but as far as I understand the  
explanation of allpass-filters. I have read but not completely understood  
Tietze/Schenk, Halbleiterschaltungstechnik, Berlin, 1980, pg. 317ff.

To my knowledge you are theoretically right, but practically a "phaser" is  
not a perfect delay. It is an allpass filter, which makes a delay, but only  
below the centerfrequency. Around and over the centerfrequency, the delay  
gets shorter. Therefor Tietze/Schenk do not call it delay but "frequency  
depending phase shift".

The (audible) difference between phaser an flanger is the difference of the  
combfiltershapes which result from the difference between the perfect digital  
delay that is used for the flanger and the "nonlinear" (don't know how to  
explain) delay of the phaser.


Gruss,
 Florian Anwander
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