Final answer:
Internal diegetic sound is the sound coming from a character's mind that the characters in the film cannot hear. Distorted diegetic sound refers to subjective distortions of sound that reflect a character's state of mind. External diegetic sound and non-diegetic sound are other types of sound in films.
Step-by-step explanation:
Internal diegetic sound refers to the sound coming from the mind of a character that we, as the audience, can hear but the characters in the film cannot. It is often presented as an interior monologue that gives us insight into a character's inner thoughts. This technique allows filmmakers to explore the internal emotional state of a character.
Distorted diegetic sound is a specific type of internal diegetic sound that reflects a character's state of mind in a subjective and unnatural way. It involves manipulating sound to create a distorted or altered auditory experience that matches the character's mental or emotional state. This can include sounds that are muffled, echoing, or exaggerated to enhance the audience's understanding of the character's perspective.
On the other hand, external diegetic sound refers to sound that is part of the film's narrative and can be heard by both the characters in the film and the audience. This includes sounds such as dialogue, environmental sounds, and music that exist within the world of the film.
Non-diegetic sound, on the other hand, refers to sound that is not part of the film's narrative and cannot be heard by the characters within the film. This includes elements such as voiceovers, background music, and sound effects that are added during post-production to enhance the storytelling or create a specific atmosphere.