Film captures image discretely, frame by frame. And relies on the physiology of ‘persistence of vision’ to create the illusion of moving image. But this phenomenon has no aural equivalent. Sound must be captured in real time, that is, it must be recorded continuously. This basic difference did not allow the two to merge and thus cinema was born mute. Later, sound could be converted into electric signals and further into light signals, giving birth to the concept of optical sound and enabling sound films or Talkies. But this equipment of recording sound was noisy and thus recording sound on location that is while shooting, was discouraged. The artists were supposed to dub later in a sound studio, trying to match their lip movements, looking at the edited film clips.
Aesthetically speaking, Sync Sound technique is a better alternative and adds authenticity to the film, and has been widely accepted. However,