Wax disc pronunciation is a technique used in early American filming of sound films. Wax disc is used to receive sound when making movies, but this kind of wax disc is different from ordinary records. In radio programs, sound waves are first collected into reels and then turned into wax discs, unlike ordinary records, where sound is recorded on wax discs. In addition, this kind of wax sheet is different from ordinary records in diameter scale and running rate because it has to cooperate with film screening. The advantage of waxed paper pronunciation is that the sound is clear, which is better than the sound on the film at that time; The disadvantage is that breaking the membrane is the most taboo. If the length of the film is more than one foot, "sound" and "shadow" will be greatly out of line.
On-film audio film, also known as "recorded film", is a kind of audio film. Recording sound waves on the vocal cords of the film base is very complicated. At that time, American Western Electric Company and Xi Ai Company owned the patent right of this technology. If the film company adopts this technology, it needs to pay a considerable fee and pay royalties when it is released.