Which of the following developments in film sound technology arrived in the 1930s and consequently freed cinema from the idea that "everything seen on the screen must be heard on the soundtrack"?
A) Dolby
B) DTS
C) multi-track recording
D) post-synchronization

Question

Quizplus · Accepted Answer

Post-synchronization, also known as dubbing or ADR (Automated Dialogue Replacement), allowed filmmakers to add dialogue or other sounds to a scene in post-production, freeing them from the limitation that everything seen on the screen must be heard on the soundtrack. This technology was developed in the 1930s and became more widely used in the following decades. Dolby and DTS are sound formats created much later, and multi-track recording was also available before the 1930s.

Which of the Following Developments in Film Sound Technology Arrived