Need guide line for BPF outputs

I am doing a matlab question of the book in which sig.mat file is given. the first part says

1. Write matlab code that Loads and play DTMF signal ( I have done this)

2. Plot the DTMF signal ( I have done this)

3. Plot the BPF outputs------> what does he mean by this kindly explain me so that i move forward

Answer 1

[Walter Roberson]

BPF might refer to Band Pass Filter.

[zohar]

Briefly !!!

And then go to google....

+1