[BC] dtmf tone filter solutions

[Rich Wood]

------ At 08:25 PM 9/18/2008, Xen Scott wrote: -------

>There was a similar problem in network television many years ago
>at NBC.  NBC would insert a small white flashing square in the
>upper right hand corner of the screen to alert the affiliates of
>an upcoming commercial break.

I remember that. Many of us used it as a "bathroom and refrigerator 
closure" I think the idea evolved into Tivo.

Rich