[sdiy] why 10V

[Don Tillman]

   > Date: Wed, 17 Sep 2003 17:58:02 +0200
   > From: jhaible at debitel.net
   > 
   > Next question: If you run a +/-5V audio signal thru a chain of N
   > unity-gain all pass filters, what will be your worst case maximum
   > level at the end of the chain ?

A Hilbert transform is probably the worst case scenario.

The Hilbert tranform is a 90-degree phase shift that's constant over
frequency.  If you apply a square wave to a Hilbert tranform, the
result is a waveform with huge spikes.

So if the all pass filter aproximates a constant 90 degree phase
shift, the output peaks could be maybe ten times the input square wave
voltage.

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com