M. radio between stations, and turn the treble control up full and the bass control down.That Hiss is a mix of most audible frequencies at once.-for #1 the headphones hava a metal thing inside that vibrates from the electrical current coming from the ipod and for ipod toutches with a built in speaker its basicly th same thing i think.and #2 im not sure but i think its because its not vibrating fast enough-1.......
The sound of a plucked string will contain the "main" frequency, called the fundamental, and numerous multiples of that frequency called harmonics. The sounds of different musical instruments have different mixes of harmonics, as a result a guitar, piano, trombone and violin, for instance, all sound different even when playing the same note. These differences can be observed using a device called an oscilloscope, an electronic device which shows electrical waveforms on a small screen similar to to computer's.
Then there's "White noise" which is a combination of all frequencies at once. To hear an approximation of white noise, turn on an F.M. radio between stations, and turn the treble control up full and the bass control down. That "Hiss" is a mix of most audible frequencies at once.
for #1 the headphones hava a metal thing inside that vibrates from the electrical current coming from the ipod and for ipod toutches with a built in speaker its basicly th same thing i think.
and #2 im not sure but i think its because its not vibrating fast enough
1. A speaker "membrane". The electrical impulse is used to vibrate a thin physical membrane of some kind, usually with magnets.
2. Frequency. The sounds we hear with our ears start at about 20 Hz (20 cycles per second). You can't vibrate your hand that fast. On the other hand, if you take a wooden ruler, hold one end against a desk and "twang" the other end, you can hear those vibrations. They're fast enough for your ear to pick up.
Your teacher is correct about the extra frequencies. Those are called harmonics or overtones. But that isn't the answer to either of your first two questions.
It's been a long struggle in synthesized sound to figure out what makes an instrument sound like an instrument. Early synthesizers started out trying to reproduce the harmonics to make a "violin" or "guitar", but they didn't sound right at all. I think basic Midi still uses that technique, which is why it sounds so terrible (ever play a Midi file on a computer?)
