Phone Tap Audio Enhancement

Hello

I suspect that my phone is tapped using the pizeoelectric buzzer.

More on how this is done is discussed here:

https://www.schneier.com/blog/archives/2010/01/eavesdropping_i.html

There's so much noise on this audio that I can't filter it out. A series of filtering and then amplifying and I can vaguely hear the audio.

The tapped phone audio is here:

https://docs.google.com/uc?export=download&id=0B5ingIYMt2rmZVRJSUQwZi1wRWc

And the target audio is here:

https://docs.google.com/uc?export=download&id=0B5ingIYMt2rmVy16emVzdXRNcHc

The first ten seconds of the phone audio, I tried to keep the room silent. At ten seconds I began playing the target audio.

Can anyone help me extract the target audio from the phone tap recording?

Many thanks!