Bugfix issue#851

[spranav1205]

Relevant Issue(s)/PR(s) #851

Textbook implementation of impulse response.

Edge cases are 0.5 and phase is taken into account.
The response maybe zero if the width doesn't fall on the sampling times, a warning can be issued for the same.

Eg.
start = 3 width = 5 dt = 4 = [0,1,0.5]
start = 4 width = 4 dt = 4 = [0,0.5,0.5]
start = 1 width = 3 dt = 4 = [0,0.5]

ps. the code has redundancies which I can remove once finalized

[matteobachetti]

@spranav1205 thanks!
A few comments: edge cases should not be plainly 0.5, but account for the exact percentage of zeros and one in a given bin. Also, I suggest implementing tests that demonstrate that the new impulse response is working correctly. I think the formulas you are using will not give the expected results!

[spranav1205]

The version I have written (and tested 😭) assigns one if the impulse response lies on a sampling time plainly and 0.5 at the edge. I can write one where the next node (or the previous) is assigned based on how many ones and zeros lie in the bin (essentially the area right?).
Is that what we are looking for??

[spranav1205]

Hey, Sorry for the delay. I have updated the code which now considers the area in each bin instead of using 0.5 directly for edge cases.

In these tests, I have used dt as 4
t0 is 5, 5, 5 and 4
width is 6, 7, 8 and 8

The code considers the incomplete bins at either end and the complete bins, which are assigned one.

Am I on the right track? If so I can continue testing and refining the code.

Thanks!

[codecov]

Codecov Report

Attention: Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.

Project coverage is 82.53%. Comparing base (ba8d06d) to head (48c25c2).
Report is 70 commits behind head on main.

Files with missing lines	Patch %	Lines
stingray/simulator/simulator.py	72.72%	3 Missing ⚠️

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Flag	BASE (ba8d06d)	HEAD (48c25c2)
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Additional details and impacted files

@@             Coverage Diff             @@
##             main     #855       +/-   ##
===========================================
- Coverage   95.98%   82.53%   -13.46%     
===========================================
  Files          48       48               
  Lines        9686     9731       +45     
===========================================
- Hits         9297     8031     -1266     
- Misses        389     1700     +1311     

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