is the sound of vinyl due to the physical process of the turntable?

Same here. I do not own a turntable, however, if the sound of vinyl comes from the physical act of the record on the turntable why can't I transfer digital audio or at least emulate that process to digitally recreate that sound? I remember back in the 1970's you had 45rpm records on the back of cereal boxes and they were not vinyl, however they sounded good why can't I do that myself?