Hi Tom, the xlating filter work fine, the phase shift is cause by another factor. Thanks for your reply.
On Sun, Aug 14, 2011 at 4:17 AM, Tom Rondeau <trondeau1...@gmail.com> wrote: > On Fri, Aug 12, 2011 at 3:50 AM, Page Jack <jack.page...@gmail.com> wrote: > > I use xlating filter to down convert signal. after I down convert signal > it > > I decode it. > > however the data decoded is still the signal in 0 frequency before down > > convert. > > I check the xlating filter code it will change the signal phase to avoid > > aliasing, yeah > > it avoid aliasing but it is not the data I want how can I recover the > data's > > phase after > > xlating filter? > > > > Regards! > > Those filters are implemented as FIRs, which means they will have > linear phase in the passband and constant (and known) group delay. > > In general, though, you will never know the phase of the incoming > signal received over the air. If you have a signal where you require > the phase, you'll have to figure out a way to recover it, anyways. > > Tom >
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