Aside

## DTMF and Filtering

11 Apr

Here we will try to show the concept of filtering using DTMF. A DTMF signal can be considered as a sum of two frequencies as shown below:

$DTMF(t) = x_{1}(t) + x_{2}(t);$
where
$x_{1}(t);$
represents the first frequency and
$x_{2}(t);$
represents the second frequency.