Doc wrote:
>> Anyone know if it's an electronic oscillator with no air being passed
>> through it or does it use a pressurized air stream? It's my
>> understanding that a brass instrument doesn't HAVE to have air blown
>> through it to work, that just happens to be the only way for a human
>> to create the necessary vibrations.
>>
>>formatting link
>
>It sounds synthesized to me. Are you sure "he" is actually playing the horn?
>Randy
The air doesn't make the sound, the trumpet player's lips have to vibrate, similar to a reed instrument - the trumpet tunes the vibrating column of air and couples it, via the horn, to the environment. Lips/breath are excitation, length of pipe is the tuned circuit, horn is the impedance matching element.
Now getting a robot to do it? A trumpet player starts the note by pressurizing the mouth, tensing the lips, then suddenly removing the tongue to start the note - similar to spitting material off the tip of one's tongue.
Without those elements it is bound to sound different even if a robot is producing the sound by blowing air into the instrument. - the cheap easy way would be to add a reed to the mouthpiece and that would make it sound more like an alto sax?
I do know for a fact that there's a church in NYC that has a few dozen trumpet - bugle pipes (one for each note) on the pipe organ and it does sound like a trumpet so there must be an organ maker that knows how to do it. Strictly speaking, it wouldn't be a trumpet any more if it had a reed in it.
Lip tension and pressure will get four notes per valve or combination of valves - 4 solid notes; with good players able to hit several higher notes per valving. A bugle is basically a four note instrument, a valve bugle is an eight note instrument.