1. Please explain digital resampling
I want to perform a number of DSP operations on a signal. The operations
require different sampling rates, so I need to split the incoming signal of
rate A into two signals of rate B and rate C.
My books explain how up- and downsampling by a factor N is done, when N is
In my application I need to generate 6000 Hz and 6800Hz signals from a
signal that has to be acquired at >8400Hz and <19200Hz. The lowest common
multiple of 6000 _and_ 6800 is 102000. I obviously need a 102KHz signal to
generate 6000 and 6800 Hz signals by just leaving out samples (as suggested
by my books).
So I think that I could sample at 10200Hz, pad each sample byte with 9
0-bytes, run an interpolation filter on that and then leave out most of the
results to reach 6000 Hz and 6800 Hz. This does not violate the up- and
downsampling chapter of my DSP book, but it looks ridiculous and very CPU
I'm sure there is a better way to resample to rates that are not multiple
of the original rate or vice versa, isn't it?
PS: I'm sorry if this is a beginner question. I don't have access to a
DSP course here in Germany. My only sources of information are the
internet and books (I always appreciate ISBN numbers of good DSP
books - in Germany bookstores don't carry them so I can't just browse
through the stores).
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