Tim Wescott wrote:

> I'm trying to think of examples where using an anti-alias filter is a
> bad idea, or must at least be approached with extreme caution.

Digital Oscilloscopes and misc. sensor data acquisition equipment, the
control systems with the ADC in the loop. Anywhere you may be interested
in the instantaneous value rather then in the averaged waveform.

Vladimir Vassilevsky

DSP and Mixed Signal Design Consultant

http://www.abvolt.com