Operation order in freq_xlating_fir

GNU Radio
1

Hello

Just to make sure, may anybody please confirm the sequence of operations
within the freq_xlating_fir_filter?

Is it:
in —>XLATE—>FILTER—>DECIM—> out

When defining the FIR taps with firdes, shall I consider the input
sampling freq or the output sampling freq (= input
sampling freq / decim) ?

Thanks in advance

Alberto

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2

On Thu, Feb 24, 2011 at 12:18 PM, Alberto T.
[email protected] wrote:

Thanks in advance

Alberto

Alberto,
Not having looked at the guts of this block for a while, I would hope
that it’s:

in—>FILTER—>DECIM —>XLATE—> out

Since we would want to perform the frequency shift at the lower
sampling rate (it’s easy enough to translate an LPF to a BPF). But the
implementation doesn’t really matter for you main question. Either way
will work and will work the same. You’ll want to specify the taps
based on the input sampling rate.

Tom