James Richard Tyrer wrote:
There is no filter response shape to worry about.
This has always been a serious issue with an analog spectrum analyzer.
In theory, it should be a Gaussian distribution. This is not realizable
because it would have to extent to infinity. But even taking a
polynomial distribution, it is still impossible to exactly realize a
band pass filter with that response function. And, the filter also
needs to have linear phase response. So, this -- the scan filter
response shape -- is an important feature and something that is better
in more expensive units.
I suspect that the band pass response shape in these devices is not
anything near a Gaussian response or linear phase.
--
JRT
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