Synchronization of background noises. Background noises, as the name suggests, are intended to convey information about the environment. Background noises itself represent audio textures such as the rustle of foliage, traffic sound of an international highway, or urban background.
Types of noises
Depending on how the noises are combined with the image they are divided into intraframe and offscreen. Synchronization is required as a rule only for intraframe noises. The process of recording and editing differs in both types of noises.
If an action takes place on the screen, other noises may sound in the background. Such noises would be called second-order noises. In most cases, second-order background noises do not require synchronization.