Re: Sine wave frequency 2
- From: Paul Burke <paul@xxxxxxxxxx>
- Date: Tue, 13 Dec 2005 14:38:39 +0000
thejim wrote:
Suppose we have a sine wave frequency. By decreasing or increasing the frequency from a limit and on the wave stops from being sine or is not?
It's not dreadfully clear what you are asking; though if I asked a question in wg=hatever is your native language (Greek?) I doubt if it would make any sense at all.
This is an answer to what I think is your question.
A sine wave is defined as a voltage/ frequency/ whatever which varies as a function of time such that the instantaneous value V = Vm sin wt. Vm is the peak absolute value, w is 2*pi*frequency, and t is time.
Obviously, any deviation from that relationship makes it, strictly speaking, not a sinewave. The deviation could be noise, distortion, maximum amplitude variation, frequency variation etc. A Fourier analyser attached to the signal would show these up as the base level, harmonics etc. as well as the pure single fundamental of a sinewave.
You are talking of a signal which can be expressed as V = Vm sin w(t) t, where w(t) is itself a function of time- in your case, I think, a ramp. You can plug that function into the Fourier calculation, do the sums and come up with the answer, for any function of time that you choose.
But we are a bit lax, and basically if it LOOKS like a sinusoidy squiggle on the scope, we call it a sine wave. Most of the time, everybody understands, or don't care anyway.
Now, why do you need to know?
Paul Burke .
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