Audio Operations for Video Production: Recording, DSP, Sync, Mixing, and Live Sound

signal chain

The complete path from the sound source to the recorded file.

studio recording

Maximizes control with quiet environments, repeat takes, and controlled mic placement.

live recording

Prioritizes reliability and isolation under pressure, focusing on fast setup and bleed management.

post-production recording

Focuses on matching newly recorded sound seamlessly with existing production audio.

microphone choice

A critical factor influencing tone, clarity, and noise in a recording.

dynamic microphones

Rugged mics that handle high sound levels well, commonly used for loud sources.

condenser microphones

Sensitive mics that capture detail well, often used for vocals and acoustic instruments.

lavalier microphones

Small clip-on mics commonly used for hands-free dialogue.

shotgun microphones

Highly directional mics used on booms to capture focused sound in film/video.

gain staging

Setting levels at each step to achieve a strong signal without clipping.

room acoustics

The characteristic sound quality of a space that affects audio recording.

high-pass filter (HPF)

Reduces low frequencies to eliminate rumble, commonly used for dialogue.

low-pass filter (LPF)

Reduces high frequencies to manage hiss or soften a sound.

parametric EQ

An EQ type allowing precise control over frequency, gain, and bandwidth.

compression

Reduces the difference between loud and quiet parts of a signal to maintain intelligibility.

limiting

A high-ratio compression used to prevent audio peaks from exceeding a set level.

reverb

Simulates sound reflections creating a sense of space in audio recordings.

delay

Repeats an audio signal after a time interval to create depth or rhythmic effects.

noise gate

Reduces or mutes audio signals when they fall below a certain threshold.

expander

A gentler version of a noise gate that reduces low-level noise without harsh cuts.

de-esser

Targets harsh 's' sounds by reducing specific high-frequency bands.

clap slate

A device used in film to create a visual and audio cue for synchronization.

timecode

A timestamp allowing for automatic synchronization of audio and video recordings.

line check

Initial check to confirm that all audio inputs are working and correctly patched.

stage plot

A diagram that communicates the layout of performers, instruments, and equipment on stage.

input list

A detailed list of all inputs, their locations, and assigned channels for audio setup.

relative level

The volume relationship between different audio elements in a mix.

panning

The placement of sound within the stereo field to create separation and realism.

subtractive EQ

An EQ approach focusing on cutting problem frequencies to make space in a mix.