Sound is a powerful and effective film technique that can affect, indicate and mold the audience on how you judge certain characters an example is, if the music soundtrack in the beginning of a film portrays a character as a hero or a leader the tempo would be yet if the music changes tempo he could be perceived a villain. 

Films are produced using three types of sounds: human voices, music and sound effects. These three types of sounds are crucial for a film to feel realistic for the audience. Sounds and dialogue must perfectly sync with the motions in a film without delay as well as must sound the way they look. If a sound doesn’t quite match the motion on screen, the action could be considered unbelievable. One way to achieve believable, high-quality sounds is to use original sound clips rather than relying solely on sound libraries for sound effects.

Synchronous sound: 

Synchronous sound can be recorded on a tape or magnetic film. Nonetheless if it’s recorded on a magnetic film then the synchronisation between the picture and sound has to be perfected in order to match both at the same speed. e.g an actors or actress’s lips have to be moving at the same speed as the sound effect to make it look genuinely realistic and synchronized. Furthermore synchronous sound is sound that is matched to certain movements occurring in the scene e.g when footsteps correspond to feet walking. This is an example of precise synchronisation where the characters lips match the speed of the sound.

Asynchronous sound: 

Asynchronous sound is defined as sound that has not been synchronized with the screen image. Moreover, asynchronous sound does include aesthetic use of sound for expressive purposes, because of the composite nature of film art, the element of sound (music, dialogue, sound effects) is highly manipulative. The sounds of a clucking chicken can be juxtaposed with a shot of a ranting politician for satirical effect.

Occasionally the audience are not able to hear the sound that the character inside the film can hear. Then the camera pans to capture a clear shot of the source of the sound showing it clearly to the audience what is happening. This illustrates the audience curious to what it is the character is hearing and starts to make him/her expect different things. 

Sound bridge:

A sound bridge can be a versatile storytelling tool when it is skillfully constructed when strategically applied in audio post production. Also when used properly, a sound bridge becomes a vibrant storytelling apparatus that cues the audience by inviting them to on the journey and enhance the story with you.This is designed to link two scenes together then transcends its most key purpose when it is used to create a connection with the audience. An example, music may continue within a scene change or throughout a montage sequence to connect the scenes collected in a creative way. 

Sound effects:

Sound effects are artificially created or enhanced sounds that are used in artistic works to emphasis as well as express an action, mood, or feeling. In one way or another are often synchronised with certain actions, such as a door’s slamming being accompanied by the appropriate noise. Since sound effects can be used in the background of a scene to create tension or creating different emotions Is a recorded sound that can be added to visuals in the editing process and included in the soundtrack to increase by boosting the narrative therefore make a creative statement.

Non-diegetic Sound: 

Non-diegetic sound is represented as coming from a source outside story space like external graphics. This does mean all sound that the audience can hear however the characters on screen are unable to. This type of sound is added later in the editing process, an example is voiceover soundtrack music that is an added sound effect for creative use within a scene. 

A source that is outside the narrative space even a voiceover narration I.e. Stranger than fiction (2006) a scene with Will Farrell playing (Harold Crick) brushing his teeth he begins to hear the narrators voice that brings an external and omnisciently element to the story.

Diegetic sound:

Is whichever sound that the characters on screen can hear, therefore is actual sound that can change both on screen and off screen. Additionally, comes from an object or a person in the story space.

Also diegetic sounds can further be categorised as source connected/source-disconnected varying on if the sound source is visible or implied on the screen. A detectible source can appear on the screen while an implied source is still part of the film world but not shown on the screen.

In most productions, capturing diegetic sound is the first and most foundational audio function. Diegetic sound is the actual sound of the production. Also, it’s all of the sounds that come from within the following:

  • Music or sounds represented as coming from within the world i.e An instrument being played.
  • Dialogue as well as sounds from your characters.
  • Sounds from actions or the moving of objects.
  • Sounds made by the environment.

Capturing diegetic sound is done through the traditional methods of filmmaking by use of boom mics, audio recorders.