a random signal which contains all of the frequencies in the audio
white noise contains these frequencies equally distributed throughout
pink noise contains equal energy per octave. pink noise, therefore has
approximately 9/10ths of its energy in the 9 octaves between 20 - 10,000
Hz while white noise has only half of its energy in this portion.
speaking noise is unwanted sound.
It is the sound that appeared in the mix that we didn't want to be there.
It is often the result of distortion
of the signal due to clipping or improper connections or the result of
the operating noise of the electronic circuitry of the equipment being
random activity of electrons - i.e. all audio systems have a noise
floor or basic level of such activity.