Trigonometry terminology

DING DING DING DING DING DING !

You got it first. I remember now but I couldn't think of it.

That only applies if the phase difference is constant.

onsdag den 6. februar 2019 kl. 23.17.39 UTC+1 skrev snipped-for-privacy@gmail.com:

if it is not then the frequencies must be different

Piss off.

..... Phil

How else could they differ?

They aren't necessarily correlated--the cross correlation of sin and cos is zero.

I'd just say "of different amplitudes and phases".

Cheers

Phil Hobbs

Grin, that's my opinion, say what you mean. Fancy words are just going to confuse me.

To me synchronous, implies phase shift = 0, sure I can set my synchronous detector otherwise, (say in quadrature to find the zero.) but if I'm using it right it should be close to zero phase shift. (or 180 :^)

George H.

"Phase-locked" strikes me as better. As has been pointed out, "correlated" has a strict mathematical interpretation, and if the two waveforms were 90 or 270 degrees out of phase the correlation would be exactly zero.

'same frequency' also works, though it's arguable whether it rules out the possibility of slight frequency difference.

NT

"Identical frequency" would be better, but "phase-locked" puts the idea more forcefully.

I'd be using the term in a write-up about frequency-domain reflectometry. I'm trying to put together a clear argument that a terminating impedance different from Z0 is equivalent to a signal of equal frequency, but different in amplitude and phase being injected in the backward direction from a Z0 impedance source.

In other words, that one can make a terminating Z0 impedance look like any impedance by putting another source of the correct phase and amplitude in series with it.

As you can see from the above, I have trouble wording this clearly and concisely.

Thanks for your collective input!

Jeroen Belleman (You don't understand a theory if you can't explain it to your grandmother .)

Am 07.02.19 um 13:51 schrieb Jeroen Belleman:

Learning by teaching (Feynman)

An unmatched impedance will give a reflected wave at the same frequency, but different amplitude and phase.

George

Thanks George, but I clearly failed to get my point across. My point was that this is indistinguishable from injecting a well-chosen backwards travelling signal through a matched impedance.

Jeroen Belleman

Yup. If you really want to learn some subject, write a book on it. ;)

Cheers

Phil Hobbs

OK, I think I read too fast and missed your point.

So this is CW reflectometry?

George H.

Call it the simulated return wave.

snipped-for-privacy@gmail.com wrote in news: snipped-for-privacy@googlegroups.com:

stimulated.

Look you illiterate sot, (am I doing well here ?) that is almost what I said but what if both of them are locked to WWV or some s*it ? One would not be derived from the other.

That seems linguistically better. The OP wanted frequency the same but phas e locked does not specify frequency. In fact one of these days, probably th is year... Since the audiophiles seem to like second harmonic distortion in their single ended triode amps, I want to see what the phase relationship does to the sound. In generally the second harmonic pollution is locked to

? due to its source.

Once I got results I will send them to the asylum, and asylum is right, fif ty grand for a turntable is insane. They're starting to approach the cost o f the lathe that cuts the record.

I have heard "both" phases of third harmonic distortion, but only at 0?

Phase locked, or phase and frequency locked is the way to put it, IMO.