Re: [Faudiostream-devel] About Select3

[Yann O. <or...@fr...>]

Hi Robert,

Robert Hamilton a écrit :
> Hello,
>
> I have a question about the select3 switch. If the index accepts only 
> a two state input, then how is the third stream selected?
The selector of select2 takes values in {0,1} but the selector of 
select3 takes values in {0,1,2}.
> I presume that one would have to use the select3 switch with a button, 
> as follows: Before the first mouse-click the index state is zero, and 
> input stream 0 is selected; after the first mouse-click the index 
> state changes to 1, and stream 1 is selected; after the second 
> sequential mouse-click, the index state changes back to zero, and the 
> stream 2 is selected; and so forth. . .  In other words, instead of 
> being based on the absolute state of the index, the output streams 0, 
> 1, and 2 are selected in sequence -- like a radio button.
Since the selector of select3 takes values in {0,1,2} you don't have to 
do that. But let say for the fun that you would like to implement a 
sequential selector, you could write :

    selector = button("next") : \(x).(x-x' > 0) : (+:%(3))~_;
    process = select3(selector);

where \(x).(x-x' > 0) transforms the signal produced by the next button 
into an impulse every time the button is pressed and (+:%(3))~_ counts 
these impulses module 3

Cheers

Yann