Average amplitude of signal is zero, why?

• A
hi there,
Why does we need to have a signal which always has the average amplitude of zero. i read some where that it would be inefficient for over transmission medium to carry a signal which have amplitude great than zero. Why?

jbriggs444
Homework Helper
hi there,
Why does we need to have a signal which always has the average amplitude of zero. i read some where that it would be inefficient for over transmission medium to carry a signal which have amplitude great than zero. Why?
It is difficult for us to confirm or refute what you read "some where". By "amplitude", you presumably mean voltage or current or some similar quantity that can be positive or negative but which is most efficient when it averages to zero. Properly, the term "amplitude" is always a positive quantity that relates to the distance from peak to trough.

However, rather than addressing your question based on guesswork, we need for you to first produce a reference to what you read.

It is difficult for us to confirm or refute what you read "some where". By "amplitude", you presumably mean voltage or current or some similar quantity that can be positive or negative but which is most efficient when it averages to zero. Properly, the term "amplitude" is always a positive quantity that relates to the distance from peak to trough.

However, rather than addressing your question based on guesswork, we need for you to first produce a reference to what you read.
I think that the distance from peak to trough is 2 x Amplitude.

jbriggs444
Homework Helper
I think that the distance from peak to trough is 2 x Amplitude.
Which is the main reason that I wrote "related". Well, that and the [vain] hope that it would deflect someone from mentioning something about root-mean-square.

Which is the main reason that I wrote "related". Well, that and the [vain] hope that it would deflect someone from mentioning something about root-mean-square.
but you surely agree that it is half the distance from peak to trough.
I have never seen it put forward as anything else.

sophiecentaur