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Thread Subject: question about digital filter

Subject: question about digital filter

From: Brian Lee

Date: 2 Nov, 2007 18:38:46

Message: 1 of 7

Is a bandpass filter equivalent to a lowpass filter
followed by a highpass filter? Thanks.

Subject: question about digital filter

From: Loren Shure

Date: 2 Nov, 2007 19:00:28

Message: 2 of 7

In article <fgfqrm$iur$1@fred.mathworks.com>, rwapp2001@yahoo.com
says...
> Is a bandpass filter equivalent to a lowpass filter
> followed by a highpass filter? Thanks.
>

it can be sometimes but isn't always.

--
Loren
http://blogs.mathworks.com/loren/

Subject: question about digital filter

From: Markus Buehren

Date: 2 Nov, 2007 19:02:52

Message: 3 of 7

Yes, it is. The transfer functions multiply when two filters
are applied sequentially.

Markus



Subject: question about digital filter

From: Markus Buehren

Date: 2 Nov, 2007 19:03:01

Message: 4 of 7

Yes, it is. The transfer functions multiply when two filters
are applied sequentially.

Markus



Subject: question about digital filter

From: Markus Buehren

Date: 2 Nov, 2007 19:03:12

Message: 5 of 7

Yes, it is. The transfer functions multiply when two filters
are applied sequentially.

Markus



Subject: question about digital filter

From: Brian Lee

Date: 2 Nov, 2007 19:27:31

Message: 6 of 7

"Markus Buehren" <mb_REMOVEmatlab@gmxTHIS.de> wrote in
message <fgfs9g$apm$1@fred.mathworks.com>...
> Yes, it is. The transfer functions multiply when two
filters
> are applied sequentially.
>
> Markus
>
>
>
Thanks Markus for quick response.
Is a 6 order lowpass filter followed by 6 order highpass
filter equal to a 12 order bandpass filter, or 6 order
bandpass?

Subject: question about digital filter

From: Markus Buehren

Date: 2 Nov, 2007 22:36:12

Message: 7 of 7

It is equivalent to a 12th order bandpass. I don't think
that it is a good idea to use a lowpass and highpass in a
row. Better use the filter design toolbox (fdatool) to
design a bandpass filter directly.

Markus


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