OK...so I am relatively new to this (I mean computers, software, and the physical properties of sound,) and this question is a little off topic: Let's say, hypothetically, that I am personally hearing human whispers directed at me and these whispers sound exactly like someone I know, hypothetically of course. If I wanted to mask or completely cancel his whispers, which I realize are two entirely different processes, could one of you give me some ideas on how to do so, respectively, and if not maybe provide me with some helpful resources or links? I will attempt to outline my current plan of attack, or should I say defense...Preferably I would rather cancel than mask (keep in mind that some of my thinking /theory may be wrong). First: I would need to record a whisper that fell within the same frequency range (wondering if tone and intonation play a crucial role? Is a whisper considered a flat, non harmonic tone?) of about 5 to 50 Hz. Second: either design a radio jammer or use a DAW, thanks Ecapsretuo, to broadcast this signal over the specified frequency range, but inversely (??? to cancel a sine wave I would need to overlap 3-4 of same recording 180 degrees out of phase to each other in a loop, but how do I determine how long the period should be???). If I used a spectrum tuner could I hone in on exact frequency and adjust accordingly? I would like this system to be portable so I am wondering whether a jammer (i.e. oscillators and/or circuits) or a compressed digital recording in mp3 format would be more practical? After all, both of these could be amplified at a later point to mask the original signal/sound/whisper...correct? Raising another question: Modulation. What type of program would be suitable and over how much area do I need to broadcast the carrier signal? In the case of the jammer, would I accomplish this with an external amplifier or by boosting battery power? If I can't determine exactly what this guy's going to say, how can I mimic the EM wave? Maybe masking is the better solution ??? Someone please help!!!!!!!