Wagner, ;-) -- > This is known as the DUMBLER effect or DUMBLER shift. As a thread continues to exist is becomes DUMBLER and DUMBLER until it degenerates into incoherent triviality. This is the newsgroup equivalent of chaos, thereby reaffirming the theory of entropy. I, for one, get a warm feeling of fulfillment each time I see a thread spiral into oblivion; and it is difficult to resist the temptation to help it find its ultimate destiny. I can't explain, however, why the frequency appears to increase as the thread moves away from the brain. An exercise for the student, I suppose. (Of course I'm kidding, hope you accept this in good fun), -- Dan Wagner Lipnharski wrote: > The original post says clearly: > "...Then I take the headphones off and hold them away...", it means to > me he is NOT moving the phones, just holding them away, so, it is > impossible for doppler effect if the distance is fixed along the time. > Why the thread divert so much? probably in few days we will be talking > about the chicken counter in Australia is generating the pitch change at > his hearphones... :) > Wagner. > > David E Arnold wrote: > > > > This is known as the "Doppler Effect" or "Doppler Shift". Look it up in the > > encyclopedia or > > a fundamental of physics textbook. > > > > Think of when a fire engine drives by, recall how it seems to have a higher > > pitch when approaching then a lower pitch after it passes and is going away. > > > > -Dave > > > > "M. Adam Davis" on 04/07/2000 07:43:06 AM > > > > Please respond to pic microcontroller discussion list > > > > To: PICLIST@MITVMA.MIT.EDU > > cc: (bcc: David E Arnold/SYBASE) > > Subject: Re: Headphones changing pitch automagically [OT] > > > > Well, the act of moving the headphones away from you would cause a drop in > > pitch, but it would normallize once the headphones stopped moving away from > > you. The pitch would rise while you bring the headphones towards you, but again > > the pitch would normalize when they stopped moving (relative to your head). > > The faster you move them, the higher (or lower) the pitch goes. > > > > If the change does not follow this description, then you might be looking at the > > inability for the headphones to send higher pitched notes very far, so they > > become less-audible the further the headphones are away from you. This would > > make the spectrum of the music sound lower, and you might percieve that the > > pitches shifted instead of the top ones disappearing. > > > > Or your psycho. Perhaps to gov't is beaming info into your head to make you > > crazy. You should try wearing an aluminum helmet (except in thunderstorms!). > > > > -Adam > > > > I respect faith, but doubt is what gives you an education. -- Wilson Mizner > > > > Rich Leggitt wrote: > > > > > > So I'm building this MP3 player, and I'm listening to the music through > > > headphones. > > > > > > Then I take the headphones off and hold them away so that I can still > > > faintly hear the music. And the strangest thing -- there's a very dramatic > > > drop in apparent musical pitch. I put the headphones back on, and the > > > pitch goes back up. I take them off again and the pitch goes down again. > > > > > > Now, I don't think the frequency is actually changing (unless perhaps the > > > bulb in the refrigerator is also staying on.) > > > > > > But I'm wondering what's going on? Is this a known phenomenon, i.e. large > > > changes in apparent amplitude and/or apparent bandwidth translated by some > > > psycho-acoustic process into changes in apparent frequency? > > > > > > Or perhaps I AM the psycho in 'psycho-acoustic'? :) > > > > > > -- Rich -- Daniel Hart Embedded System Design Engineer NBS Technologies, Inc. (Card Technology Corp.) 70 Eisenhower Drive, Paramus, NJ 07652, USA +1 201 845 7373 x183 dhart@nbstech.com