Re: [Discuss-gnuradio] Channel Model block - Epsilon effect on band edges

[Murphy, John]

eh, nevermind, hit send too quickly on a long day (decimators are
probably a special case, but rational resamplers when they interpolate
are going to generate aliases that fold back in band when decimated,
so yeah never mind)

John Murphy
address@hidden


On Thu, Jun 18, 2015 at 1:20 PM, Murphy, John <address@hidden> wrote:
> On further thought, not all resamplers need filters. In fact this may
> be about the ideal case where a resampler does not need a filter.
> If you are resampling a signal that does extend fully to the band
> edge, and your resample ratio is close enough to unity to avoid
> aliasing at the target new rate, do you still need to filter?
> And with a Epsilon on the order of 1+/-1e-7 or so the change in
> bandwidth from sample rate change is so small you can not even see it
> on a spectrum with human vision.
> Am I outside the box or up the creek without a paddle?
>
> John Murphy
> address@hidden
>
> On Wed, Jun 17, 2015 at 1:06 PM, Tom Rondeau <address@hidden> wrote:
>> Timing change is done by adding or removing samples, which is a form of
>> resampling. All resamplers must also be filters to handle the signal changes
>> correctly. What you're seeing here is the effect of the filter in the
>> fractional_resampler.