[Premium-Rx] Filter phase response

[George Georgevits]

Jon has the right idea here. I believe Gaussian response is another name for
Bessel response, as per my earlier note. It has the best phase response, but
the slowest fall-off in amplitude response for any given order filter.
Consequently, it comes into its own only when implemented in DSP, because
implementing high order filters is not such a problem when done in software.
If you try to implement a high order filter (say 20) in the analogue world,
variations in component values and finding the required many obscure values
beats you even at audio, let alone at an IF.

Regards,
George Georgevits
VK2KGG


-----Original Message-----
From: premium-rx-bounces at ml.skirrow.org
[mailto:premium-rx-bounces at ml.skirrow.org]On Behalf Of Jon Iza
Sent: Thursday, 9 October 2003 12:10 AM
To: premium-rx at ml.skirrow.org
Subject: [Premium-Rx] Filter phase response


Folks,
I talked to one of the researchers on the Digital Radio Mondiale DRM
project, and they found that the filter phase and delay was important for
good reception (it has to be at least 12 kHz wide).
I was ashamed to know how deep was the knowledge of that very young engineer
(a gal) on that matter. But she didn't know what a radio skip is and why she
was not able to receive some stations quite close to the receiving site...
Nobody's perfect. ;-)
jon, ea2sn


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