bandwith snr
Sorry, ill rephrase my question.
Im working on some software that takes an audio input from the PC line input and applies gaussian noise of a given power to acheive a desired SNR, then passes the output to the soundcard line output.
A calibration routine measures the input signal power. The bandwidth is set by a filter on the soundcard output.
On the software interface are three parameters intrinsically related, these being bandwidth, SNR and noise power. Changing one alteres the other two.
Thus Im trying to understand the relationship between these parameters.
Hope this clarifies my question.
On an separate note, I am also slightly thrown by a reference in literiture Im reading that suggests that a 6dB difference exists between a "coherent" signal source and an "incoherent" noise source.
I think the term coherence used here is referring to in time i.e. a coherent signal source has strong correlation at time intervals, whereas a true noise source is always uncorrelated and thus incoherent.
Is my understanding of the (in)chorent term correct and any explanation of the 6dB difference???
Thank you