Finding Tbeat for 2 waves of periods T1 and T2 using oscilloscope

  • Thread starter -EquinoX-
  • Start date
  • #26
564
1


I think I can be more clear by using the image

http://en.wikipedia.org/wiki/File:Beating_Frequency.svg,

which should be similar to what you see on the scope when you sum channels 1 and 2.

There are two characteristic time periods in this image, the time between consecutive black peaks, and the time between consecutive orange peaks. Measure both these periods with the scope. Which is which?
you mean one is T_beat and one is T_bar?
 
  • #27
George Jones
Staff Emeritus
Science Advisor
Gold Member
7,369
974
  • #28
564
1


in that case the black one is T_beat and orange is T_bar, is this correct?
 
  • #29
George Jones
Staff Emeritus
Science Advisor
Gold Member
7,369
974


in that case the black one is T_beat and orange is T_bar, is this correct?
Oops.

I know you're not applying this to sound, but I want to use sound as example. Two musical instruments that are not quite in tune play the "same" note. What do you hear?

Pitch is determined by frequency, and you hear the average of the two frequencies, i.e., the black. But you hear the loudness of the tone vary with time - loud, soft, loud, soft, ... This is the phenomenon of beats.

Loudness is determined determined by the orange "envelope", so this gives the period of the beats.
 
  • #30
564
1


oh I see, so I got it reversed then.. orange is T_beat and the black one is the T_average... thank you so much for explaining this, I appreciate it
 

Related Threads on Finding Tbeat for 2 waves of periods T1 and T2 using oscilloscope

  • Last Post
Replies
2
Views
6K
  • Last Post
Replies
4
Views
5K
Replies
1
Views
2K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
8
Views
513
  • Last Post
Replies
1
Views
2K
Replies
2
Views
5K
Replies
3
Views
3K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
7
Views
22K
Top