- #1
tomelex
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First, as an electronic tech, 30+years, I learned about a sinewave,
definition: a wave that can be expressed as the sine of a linear function of time, space or both.
Key here to me is the word expressed.
The sinewave I learned about was a phasor going anti-clockwise in a circle. Thus, the sin button on my calculator responds to that "circle" type sinewave, and ONLY that type.
That corresponds to what we learned about generators, physically magnets in a circle and you rotated the coils within and got out the sinewave (of what I call a circle), the one that the calculator button represents. I orginally thought this was the only type of sinewave due to the fact that that is what was taught in school and in electronics courses! Damn confusing!
But, per the definition above (from 1976 Radio Shack dictionary of electronics), that phasor does not have to be rotating through a circle, but any waveform shape, and as long as we take the opposite over the hypotenuse we get a sinewave.
Now, there are a lot of engineers out there that seem to be talking nyquist and fourneir and such, and acting like music is made up of sinewaves. That is fine, but in all my searching, only a tuning fork and I think one other instrument or so actually produce the particular "circular" type of sinewave as seen from an electronic generator.
Am I right about this, that there are very few true "circle" sinewaves in music, although tons of them in regards to the definition of a sinewave.
Also, am I right to be cautious about understanding that just because we can construct any waveform from "sinewaves" , that does not mean they actually exist in the waveform.
I am sorry if this is a long post but I thought it better to show how I was approaching this so you could see my logic/lack of logic etc.
Thanks,
Tomelex
definition: a wave that can be expressed as the sine of a linear function of time, space or both.
Key here to me is the word expressed.
The sinewave I learned about was a phasor going anti-clockwise in a circle. Thus, the sin button on my calculator responds to that "circle" type sinewave, and ONLY that type.
That corresponds to what we learned about generators, physically magnets in a circle and you rotated the coils within and got out the sinewave (of what I call a circle), the one that the calculator button represents. I orginally thought this was the only type of sinewave due to the fact that that is what was taught in school and in electronics courses! Damn confusing!
But, per the definition above (from 1976 Radio Shack dictionary of electronics), that phasor does not have to be rotating through a circle, but any waveform shape, and as long as we take the opposite over the hypotenuse we get a sinewave.
Now, there are a lot of engineers out there that seem to be talking nyquist and fourneir and such, and acting like music is made up of sinewaves. That is fine, but in all my searching, only a tuning fork and I think one other instrument or so actually produce the particular "circular" type of sinewave as seen from an electronic generator.
Am I right about this, that there are very few true "circle" sinewaves in music, although tons of them in regards to the definition of a sinewave.
Also, am I right to be cautious about understanding that just because we can construct any waveform from "sinewaves" , that does not mean they actually exist in the waveform.
I am sorry if this is a long post but I thought it better to show how I was approaching this so you could see my logic/lack of logic etc.
Thanks,
Tomelex