Conditional selection

[juha_tp]

If one wants to stay with DSP code component, how to code conditional selection?

pseudo code:

Code: Select all

switch value
case (1, 3, 5, 7)
... 
otherwise // 2, 4, 6, 8
...
end

Any examples out there?

[adamszabo]

I believe its only possible with assembler

[Spogg]

Maybe this will help...

viewtopic.php?f=4&t=8731&hilit=bitmasking

Cheers

Spogg

[juha_tp]

Maybe this will help...

viewtopic.php?f=4&t=8731&hilit=bitmasking

Cheers

Spogg

I did look that thread earlier but, could not find examples of usage since I need to make at least four operations (calculate coefficients using degree 3 polynomial equations) when the condition is true instead of just making one operation.

I guess "if" type statement could work if condition is checked for every coefficient calculation operation:

Code: Select all

if(x % 2 != 0) a0 = polynomial
if(x % 2 != 0) a1 = ...
if(x % 2 != 0) b0 = ...
if(x % 2 != 0) b1 = ...

if(x % 2 == 0) a0 = ...
...

Could this be possible ... ?

[adamszabo]

That would use way too much cpu, since it still calculates all your equations even if they are not "enabled"

[tulamide]

First thing that came to my mind was cubic interpolation, but you wouldn't need any conditionals for that, and it seems to be code for a filter. Maybe if you elaborate on the topic? Maybe there is another way?

Simple example, if you're only interested in every second sample, you could use hop(2) and had no need for the conditionals anymore.

[wlangfor@uoguelph.ca]

I'd love to know the answer to this as well.

[juha_tp]

What I'm trying to do is a LR crossfeed plug-in without Ruby code. I'm using polynomials to calculate coefficients (in attached example I'm using BLT based implementation).

There's also something wrong with the LPF filter.

EDIT: attached the schematic

[adamszabo]

Its best if you post a schematic because we have no idea which filter you are using that is different from the left or right channel, these graphs dont really tell us anything

[juha_tp]

OK, updated my previous post with schematic.