Re: [Discuss-gnuradio] Block with N inputs and M outputs (M>=N)

[Achilleas Anastasopoulos]

Michael,

Thanks for the info.
Indeed I am looking into small numbers of M,N (order of 10)
so this should work.

Can I ask for a clarification here:

> If the interpolator block doesn't do it for you (I think it does, so try
> to inherit from that code), 

Since my overall interpolator block is an M/N-interpolator, even if I 
inherit from interpolator, it does not force output_multiple to M,
but rather multiples of (M/N), which is not what I want.
I guess I have to inherit from block and do that manually using 
set_output_multiple(M), as you suggested.

am I right?

> use "set_output_multiple(M)", then make sure
> your "forecast()" function sets the input stream's required items
> correctly (to a multiple of N).  "forecast()" will always be called with
> "noutput" being a multiple of "M", which makes finding the required
> items simple (#in = #out * M / N).  You should do an "assert(M % N ==
> 0)" before before the divide just to be sure it's OK.
>
> Hope this helps! - MLD
>
> On Mon, 10 Apr 2006 09:36:51 -0400, "Achilleas Anastasopoulos"
> <address@hidden> said:
>
> > I am trying to write a block that takes N inputs at a time
> > and produces M outputs at a time.
> > Since M>=N this is an interpolator.
> > However, M/N is not neccesarily an integer.
> >
> > Is there an elegant way to force the work() function to
> > process a multiple number of N input samples every time it is called?

--
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Achilleas Anastasopoulos                        
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