Vasile Surducan wrote:
> I need a low pass filter with an abrupt shape between pass band and
> stop band (like Cauer or elliptical) but with a constant group delay
> in the passband, like Bessel. Does something like that really exist ?

Convolution by a sync pretty much leaves the signal alone in the passband
and has a very abrupt cutoff, depending on the size of the filter kernel.


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