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David McQuate wrote:
<blockquote cite="mid:4A301187.6020300@sonic.net" type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
I agree with most of what you wrote except the statement that frequency
resolution is increased.
When you decimate, you reduce the effective sampling rate, but you also
reduce the number of
samples. The frequency resolution (SamplingFrequency / NumberOfSamples)
is not changed.</pre>
</blockquote>
Yes and no. What I suggested is to compute the FFT with the _same_
number of points<br>
as before, and this will undoubtedly increase the resolution.<br>
<br>
Of course, you will need a longer time to collect the same number of
samples at a reduced<br>
sampling rate, but this is an unavoidable price to pay... as others
have remarked, time and<br>
energy (frequency) are two dual quantities, and the more precisely you
know one of them,<br>
the more uncertainty you have on the other...<br>
<br>
73 Alberto I2PHD<br>
<br>
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