Power Spectral Density Function (Can it be a number)

[ashrocks]

Today, I am confused with my professor's eternal brilliance,

He say a Power Spectral Density function returns a number which represents complete power of a signal.

I am dealing with a low power noise.
Can i really get a number in dB instead of dB/Hz for a random signal which gives a power.

He says, it will not be in books, find out by yourself.
I don't know if i need to change a universal meaning of a density function to merely a number value.

Can anyone please help me in making him understand.

He claims, if PSD is integrated over limits , it returns a value which is true.
What power does a noise signal represent in dB.

Thanks for all inputs

Added after 57 minutes:

9 Views and No reply.

I guess my question is confusing everyone.

let me make it in simple words.

Can we find power of signal over a frequency range in dB

Would that be called a power spectral density, whose units are dB/Hz

If the frequency range is (-∞,∞), PSD is ∫(FT(signal)

Can we find a value of PSD in dB?

 

[amir88]

Today, I am confused with my professor's eternal brilliance,

He say a Power Spectral Density function returns a number which represents complete power of a signal.

I am dealing with a low power noise.
Can i really get a number in dB instead of dB/Hz for a random signal which gives a power.

He says, it will not be in books, find out by yourself.
I don't know if i need to change a universal meaning of a density function to merely a number value.

Can anyone please help me in making him understand.

He claims, if PSD is integrated over limits , it returns a value which is true.
What power does a noise signal represent in dB.

Thanks for all inputs

Added after 57 minutes:
Maybe this be helpful:
PSD is definable in a range of frequency if so you got a number for special frequency and for all the frequecny you got numbers corresponds to thier frequency.For more information I advised to consult matlab help and search for "noisepsd" and see the results