Why translate center frequency (instead of band edge) to baseband?

Hi all,

I know it?s standard fare to translate to baseband the center frequency of
a band of interest. But given the choice, why do that instead of
translating to baseband the lower edge of that band?

In my application (legacy code, dealing with acoustic data) after
translating to baseband, subsequent decimations may be performed to
further lower the bandwidth. The result is filtered to prevent aliasing.
I?m guessing that by centering the band, a bandpass filter can be applied
instead of a low pass filter and that somehow the coefficients for the
former are easier to generate than the latter (or perhaps they form a
smaller set, and so fewer cpu cycles are required). Being relatively new
to this field, I can?t say I know, but I?d like to.

Thanks for taking time to help.

Regards,

LM



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