Re: Integrate block functionality

[Marcus D. Leech]

On 12/20/2019 11:33 AM, Joe K wrote:

Yeah, I understand it's not a practical thing in reality, this is mostly for a short-duration simulation which runs for a few K samples then stops. Obviously any real-world signal with any DC bias would rail this out.

I'm still surprised the integrate_x blocks allow a decimation = 1 since that effectively makes the block a pass-through.  The block documentation could use some help here.  I just requested a Wiki login and could probably make some edits to clarify this for the less-informed.  I presume that's the point of requesting a Wiki login, anyway!

I had tried the IIR approach unsuccessfully at first (not really knowing their standard form, I guess), but just revisited it, and yes, I can make that work.  Again, the documentation is pretty .. light, heheh... (https://wiki.gnuradio.org/index.php/IIR_Filter).  Probably not a big deal if you know DSP inside and out, I'm sure it's a standard thing, though.

Thanks again,

Joe

GR has always been "light" on explaining the fundamentals in the field of endeavor.  While this isn't "deliberate", it's kind of an emergent
  property of an open-source project where most of the document producers are the developers, and there aren't a team of
  tech-writers involved to produce large amounts of background material.

Contrast this to frameworks like MatLab, where they have a small army of (paid!) tech-writers who can document not only the *how* of
  a processing block (which is typical of developer docs), but also the *why*.

I am reminded of a quote from Dylan Thomas' "A Child's Christmas in Wales".

 "I received a nature book, with everything about the wasp, except for 'why?'"

Having said that:

https://wiki.gnuradio.org/index.php/Tutorials

https://wiki.gnuradio.org/index.php/SuggestedReading

On Fri, Dec 20, 2019 at 8:08 AM Marcus D. Leech <address@hidden> wrote:

A IIR filter with Alpha and Beta both set to 1.0 will accomplish this. 
Although, in real life, most people using integration functions in DSP want
   something more like what the integrate block does, since without a
"dump" type operation, the integrator output will "rail" pretty quickly.