Transfer Function of Two Filters in Parallel

From: Chris Barrett <"chrisbarret"@0123456789abcdefghijk113322.none>
Date: Thu, 26 Apr 2007 15:54:50 -0400

I have two filters in parallel. The transfer functions are given by H1 and H2. I've illustrated the setup below.

.-- H1 ---.
| |
in --------| (+)------> out
| |
'-- H2 ---'

How do I find the transfer function of two parallel filters? Do I merely sum the two together?

sum = H1+H2

I would think this would work, but I would be worried that the phase responses would throw the result off. How do I find the combined transfer function?
.

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  - From: Randy Yates

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