Klaas Robers wrote:We also observed this on the output wave forms of your SSTV modulator. It is impossible to prevent this to happen.
Steve Anderson wrote:Klaas Robers wrote:We also observed this on the output wave forms of your SSTV modulator. It is impossible to prevent this to happen.
I assume you mean demodulator, if so, yes the output filter being a Butterworth one inevitably introduces over and undershoot. A bessel filter would be far better in this respect but it wouldn't suppress the remnants of the sub-carrier enough. Hence my interest in digital filtering, but that's a way down the line.
However, the modulator that produces the files I currently generate from a .tiff file also has a filter on the input of the A-D. I've been thinking this over for a while now. There's a whole D-A, filter, than A-D process that I need to bypass. It's just finding the time with all the other stuff going on.
Steve A.
Andrew Davie wrote:I have a possibly related question in this post.
Harry Dalek wrote:...makes me want to make Steve's when we can get around to it .
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