can two cars traveling at different speed be always next to each other?Can two signals of different frequencies be in phase?
Also, odd harmonics have a fixed, repeating, complimentary phase pattern. That counts for me.If one frequency is an even harmonics of the other ( a factor of 2, 4, etc.) then yes, there zero crossings can be in phase.
Yup, it's called music.Can two signals of different frequencies be in phase?
Can two signals of different frequencies be in phase?
That's not the definition of "in phase".Also, odd harmonics have a fixed, repeating, complimentary phase pattern. That counts for me.
In NTSC video, I and Q are the same frequency, 90 degrees apart. Q stands for quadrature.As MrAL said, it depends on how you qualify phase. Can I and Q signals be considered in phase?
One signal always starts when another is 15 degrees ahead of it. Are they in phase?
Two signals would be coherent if they have a constant relative phase but coherence means more than just phase for electromagnetic waves.As MrAL said, it depends on how you qualify phase. Can I and Q signals be considered in phase?
One signal always starts when another is 15 degrees ahead of it. Are they in phase?
Please explain .
What about when the even harmonic passes the falling edge of the original wave?If one frequency is an even harmonics of the other ( a factor of 2, 4, etc.) then yes, there zero crossings can be in phase.
Please explain.
The application is a PLLHi there,
The actual answer to this depends HIGHLY on the application, in fact, very highly, because in some applications a particular set of two frequencies would be considered 'in phase' when in other applications those same two frequencies would be consider VERY out of phase.
You've already seen several examples of applications where two frequencies can be said to be 'in phase', like music, harmonics, etc. Harmonics are often given a phase relationship to the fundamental, and sometimes it happens to be zero degrees while other times it may be different but constant. This means a frequency 2 times the first frequency could be called in phase and be perfectly descriptive. i am not so sure that "in phase" is the best way to describe this though, i would say the "same phase" is a better way to put it, or just describe them as both being at 0 degrees or whatever. Saying "in phase" might imply that they are of the same frequency.
An application that does not follow this rule though is for example a phase locked loop, In a phase locked loop, if the reference frequency is half of the target feedback frequency, even if they have some zero crossings in sync, the second frequency would be called very out of phase. It's only when it is brought up (or down) to the correct frequency can it be really in phase and then the loop locks. If the reference frequency is half or two times the feedback frequency the loop never locks properly.
Of course another example where we need the same frequency is in a three phase power system, where if phase A is called zero degrees and phase B has every other zero crossing synced to phase A but is twice the frequency, you better have some fuses on hand
So to be accurate, you have to specify the application as well as the type of waves themselves.
Hi,The application is a PLL
To be "in phase", the angular velocity of the two signals must be the same. The only way to do that is to have both frequencies the same. Zero crossings have nothing to do with determining whether or not two signals are "in phase".Please explain.
Yes... I and Q are always in phase.As MrAL said, it depends on how you qualify phase. Can I and Q signals be considered in phase?
If they are the same frequency, then yes.One signal always starts when another is 15 degrees ahead of it. Are they in phase?.
YesTwo signals....same frequency and both start at zero. One has amplitude of 5 and the other 10, are they in phase?
Not in phase (what is "double phase"?).Is the second harmonic in phase, or in double phase?
??? Very much non sequitur.And all cars travel at the same speed. They just have different wiper speeds.
Your homework is your responsibility.Please explain .