which of the following is a sample of background noise? how to estimate the fraction of the samples that are part of the background noise process? why does noise have a linear distribution can noise be a a priori what are the three ways the noise is related? what is the problem with using an a priori threshold to separate a mixture of noise? how to estimate the fraction of background noise how to figure noise from noise why do we need a threshold when using background noise curve how to separate background noise from non-noise noise how to separate noise from noise how do you separate a mixture which is an example of a noise-free noise mixture why is noise used to separate mixtures how to find background noise what is the example of noise how to find the frequency distribution of background noise what is the a priori noise distribution how to separate noise from noise what is the noise process and how do you measure the noise pattern in an experiment