CTCSS Encoder [imported]

[cmaglie]

This is Issue 441 moved from a Google Code project.
Added by 2010-12-30T16:36:57.000Z by [email protected].
Please review that bug for more context and additional comments, but update this bug.
Closed (Fixed).

Original labels: Type-Enhancement, Priority-Medium, Component-Docs

Original description

Hi everybody,
i have some friends still searching a nice way to create CTCSS signals (http://en.wikipedia.org/wiki/CTCSS)
i already created a array with those frequencies and some choosing code which results in a 3020 byte rom
To create those tones i used the tone() function.
My question now is: is tone() capable of using float values?

I thought about how to solve it when tone() only can use integer values.
Multiplying the value by 10 and to use an external counter to divide it by 10 should give good results (some external components are needed in any way, since its just a pwm signal and a sinus is needed).
Maybe someone has a better idea how to do it.

currently hardware-decoder chips aren't available for the masses and there is just a guy from switzerland who sells programmed PIC-µCs for about 100$... so a new sollution is needed