echo47 said:What does "ve" mean?
echo47 said:Ok thanks, a new term for me.
My scope is probably similar to yours. It doesn't have any built-in vector or quadrature measurements. I have to interpret the waveforms visually. Or I could download the waveforms into my computer and analyze them there.
My approach to negative frequency resembles this article in RF Design. Look for the sentence, "negative frequency can be given a solid physical meaning by defining it properly in the context of complex, or quadrature, signals."
**broken link removed**
I may be demented, but I'm not alone!
echo47 said:It sounds like you are unfamiliar with complex (quadrature) signals. The signal has two orthogonal components, I=cos(2*pi*f*t) and Q=sin(2*pi*f*t).
echo47 said:It's easy to examine those waveforms, observe the inverted sine component, and determine if f was positive or negative. (see my scope snapshots)
echo47 said:We seem to be communicating on different wavelengths. I'm not sure how to continue. Sorry, I give up!
LvW said:OK, thanks to pointing my attention to your contribution in “rfdesign”. In this excellent article you have defined a negative frequency as a sinusoidal wave shifted by 180 deg with respect to the original signal.
(Quote: For now, the definition of the -600 Hz sinewave is one whose phase is shifted by 180° relative to a +600 Hz sinewave).
And this is the answer to my question posted above (June 29th, 10:57).
And, at the same time, this clarifies our different positions – as your argumentation is based on the following simple rule: sin(-wt)=-sin(wt).
okay even if I try to believe you than what about
cos(-wt) = cos(wt)
So are there negative frequencies for Sine only?
I also think some people here are confusing negative frequency with complex frequencies
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