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Frequency is like distance it is always positive (You can make a step backward or forward) The direction is another issue.echo47 said:I like the rotating wheel analogy: RPM is frequency, clockwise and counter-clockwise are negative and positive frequencies. The rotating wheel is analogous to the rotating vector of a quadrature (cosine,sine) signal. More info:
https://en.wikipedia.org/wiki/Negative_frequency
Bhanumurthy said:.....And obviously, the role of negative freq. is very much applicable here.
Hope u got my answer. Regards Bhanumurthy.
echo47 said:I mean sign of the frequency. I can probe a quadrature signal with my scope to see if the frequency is positive or negative. That's real enough for me.
We are merely discussing definitions of terms here. I suppose it's fine to consider positive and negative frequency to be just a mathematical abstraction..
echo47 said:The distinction between what's real and what's abstract/theoretical/imaginary is probably best answered by a philosopher. I prefer to simply build stuff.
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). Such signals (usually modulated in various ways) are widely used in modern communication and signal processing systems. You have a whole new world to explore!