[Scott Dorsey]

Frank Stearns wrote:
Are we assured that a typical digital high pass filter, say of the type found in the
EQ of Protools 8 and later, removes DC offset?

I don't know about Protools. But a real high pass filter will remove DC
offset. There's no obvious error I can think of in a dsp filter that would
cause it not to.

There's a lengthy back story here which for brevity sake I'll not get into, but it
seems that a digital HPF is not removing DC offset -- at least in PT.

What makes you think so? The waveform not be centered around zero all the
time, sometimes that's just the way the waveform is.

Take every sample, sum them all together... and you won't necessarily get
zero either.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."