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Re: [Discuss-gnuradio] Processing multiple signals off single source blo
Re: [Discuss-gnuradio] Processing multiple signals off single source block
Thu, 22 Aug 2013 13:28:24 -0700
On Thu, Aug 22, 2013 at 3:24 AM, Marcus Müller <address@hidden>
On 08/21/2013 08:15 PM, Luke B wrote:
- What is the best approach performance wise for
selecting multiple ~15khz channels from a 2mhz+ source block?
Is it using a Xlating
FIR Filter with a low-pass? Is it more efficient to use a SIN
Sig source & Multiply Block with a low-pass FIR Filter? Is
there a better way to extract a filter?
Xlating FIRs just generate the sin internally and apply it
themselves; they are mathematically equivalent to shifting your
signal and filtering it afterwards.
FYI, the Xlating FIR filter uses a rotating complex unit vector (with periodic renormalization) to accomplish the frequency shift, so this is much more computationally efficient than the signal source block.
Also, it may be an option to use the polyphase channelizer block.
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