Hopefully I ' m not being insensitive but this was entertaining to read , amazing how nutty N ' s can get at INANIMATE OBJECTS . I had a Furby too that freaked me out as a kid , maybe it ' s just repressed memories of something like this happening . <| sep |> You sound really stupid . <| sep |> Try this Hope you like it <| sep |> My question is , why not use galtier as lead instead ? <| sep |> Using a range of frequencies help differentiate distance . In fact RADAR sends out a chirp signal , which is a frequecy sweep . Think of it like this , if I send out a sine wave , and it bounces off an object , then the phase of the received signal will depend on the distance to the object . But with only a single sine wave , the same inversion of phase will occur at periodic distances . By sweeping the frequencies , this is no longer a problem . In fact , you should receive a signal cosf tq , where t is time and q is a time delay of the object . By sending out a sweep of frequencies , the reflected signals off different objects will be at different frequencies at any given point in time . This allows for easier decoding .