Re: Butterworth delay

On 15 Jun, 13:43, "Chris_R" <creedrog...@xxxxxxxxx> wrote:
Increases in analog filter order for a Butterworth filter increases its
delay, correct?  I've heard of methods for making up for the delay incurred
- sometimes referred to as running the filter both backwards and forwards..

Define 'delay'.

There are at least three different concepts at work here:

- Phase distortion due to non-linear phase responses
of the filter.
- Latency, caused by the time it takes for a DSP
device to actually do the necessary computations.
- On/Off-line processing. There are certain things that
are possible if you have all the data available up front,
that are not possible if you process an ongoing stream
of data.

So describe the data flow in as exact detail as possible,
and you might recieve useful answers.

Rune
.