On 27/01/2021 20:35, Fred Jensen wrote:
It follows that you'd probably like the selection of roofing filters to follow the DSP BW as closely as possible.
Having the roofing filter too close to the DSP filter is not necessarily a good thing, as the roofing filters are likely to have worse passband ripples and will have non-linear phase responses, which can compromise digital modes. At least some of the DSP filters are finite impulse response, meaning they are also linear phase, which means that pulses will not get smeared out.
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