I want to know if I have source noise of some value and signal noise of some value so in order to add both of them for example a source noise signal of value 2 and signal which is to be amplified is taken 3 so we have to simply add them like 5?

 

Read here: https://electronics.stackexchange.c...rms-and-peak-to-peak-value-of-the-output-sign

 

Noise has frequency content.
You cannot simply add 2 + 3 = 5.

 

Noise has frequency content.
You cannot simply add 2 + 3 = 5.

so can you tell me how to add two noise signals ?

 

I have no idea what you mean by "source noise" and "signal noise". Define your terms. And tell us how these two are combined.

Bob

 

I have no idea what you mean by "source noise" and "signal noise". Define your terms. And tell us how these two are combined.

Bob

Thanks for your reply,I want to know how to add two noise signals my question was that if I want to amplify a signal and signal to be amplified contain some noise the system (the amplifier) also contains some noise so the net noise will be what addition of both noises ?

 

You have one field with 2 piles of hay and another with 3 piles of hay. If you bring all the hay together, how many piles of hay would you have?

Or you can watch this:

 

Depends on whether the hay is in phase or out of phase.

Bob

 

Noise (rumble and hiss) have random frequencies and levels. Randomly they add and randomly they cancel. Since some parts of a random signal have no frequency or level then I think the average level of two noises added together increases more than the level of only one of them.

 

From the link in #2:
A useful formula to know when adding two signals which do not share any frequencies in common is:

 

From the link in #2:
A useful formula to know when adding two signals which do not share any frequencies in common is:
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