The asperity noise is an unfortunate aspect of sound that is caused by minute and unavoidable imperfections on the tape the sound is recorded on. This can be minimized with digital recording, and as production moves in that direction this problem becomes less, but there is still a risk of asperity noise even with digital. 

 

Camera noise can sometimes refer to asperity noise, and other times it refers to the sound of the camera running, but not necessarily the sound being picked up by the sound recorder. All film cameras will make some noise, but digital filming will eliminate camera noise.