Originally Posted by TV Tropes
Although it may not seem so, laugh tracks were surprisingly sophisticated systems at the height of their use. Rather than being just simple recordings of a laughing audience, they were actually carefully generated and mixed, with such discrete components as "the guy who gets the joke early" and "housewife giggles" and "the one who didn't get the joke but is laughing anyway" all precisely blended and reblended to create the illusion of a real audience responding to the show.