Glossary

Aliasing (Audio)

Audio Aliasing

Distortion occurring when audio frequencies above the Nyquist limit are sampled, producing false lower frequencies.

Audio Codec

Software that encodes raw audio into a compressed format and decodes it back for playback (e.g. MP3, AAC, FLAC).

Audio Fingerprint

Acoustic Fingerprinting

A compact digital summary of an audio signal used to identify songs or detect duplicate content.

Audio Watermark

Audio Watermarking

Embedding imperceptible identifying data into an audio signal for copyright tracking and content identification.

Bit Depth (Audio)

Audio Bit Depth

The number of bits in each audio sample, determining the dynamic range and noise floor (e.g. 16-bit, 24-bit).

Bitrate

Audio Bitrate

The amount of audio data processed per second, measured in kbps, directly affecting quality and file size.

Channel

Audio Channel

An independent audio signal in a recording (mono = 1, stereo = 2, surround = 5.1+).

Chorus Effect

Audio Chorus Effect

An effect that duplicates a signal with slight pitch and timing variations to simulate multiple voices or instruments.

Clipping

Audio Clipping

Distortion that occurs when an audio signal exceeds the maximum level a system can handle.

Codec

Audio/Video Codec

Software that encodes and decodes audio or video data, determining the compression algorithm used.

Compression (Audio)

Dynamic Range Compression

Reducing the volume difference between the loudest and quietest parts of an audio signal.

Crossfade

Audio Crossfade

A smooth transition between two audio clips where one fades out while the other fades in simultaneously.

De-esser

Audio De-esser

A specialized compressor targeting sibilant frequencies (4-10 kHz) to reduce harsh 's' and 'sh' sounds in vocals.

Delay

Audio Delay Effect

An effect that records and plays back audio after a set time interval, creating echo and rhythmic repetitions.

Dithering (Audio)

Audio Dithering

Adding low-level random noise when reducing bit depth to mask quantization distortion and preserve detail.

Dynamic Range

Audio Dynamic Range

The difference between the quietest and loudest parts of an audio signal, measured in decibels.

Equalization

Audio Equalization

The process of adjusting the balance of frequency components in an audio signal.

Fade

Audio Fade

A gradual increase (fade in) or decrease (fade out) in audio volume over time.

FLAC

Free Lossless Audio Codec

An open-source audio codec that compresses audio without any loss in quality, reducing file sizes by 50-70%.

Frequency Spectrum

Audio Frequency Spectrum

The range of frequencies present in an audio signal, typically from 20 Hz (bass) to 20 kHz (treble) for human hearing.

Harmonic Distortion

Total Harmonic Distortion

The presence of frequencies that are integer multiples of the fundamental, sometimes added intentionally for warmth.

Limiter

Audio Limiter

A compressor with a very high ratio that prevents audio from exceeding a set maximum level.

Loudness War

The trend of increasing audio loudness in mastering at the expense of dynamic range, countered by LUFS standards.

LUFS

Loudness Units Full Scale

A standardized loudness measurement reflecting perceived volume, used for broadcast and streaming normalization targets.

Mid-Side Processing

Mid-Side Audio Processing

A technique separating stereo audio into center (mid) and sides signals for independent processing.

Mono

Monaural Audio

Audio reproduced through a single channel, where all sound comes from one source.

Noise Gate

Audio Noise Gate

A processor that silences audio below a threshold level, eliminating background noise between sounds.

Noise Reduction

Audio Noise Reduction

Techniques for removing unwanted background noise from audio recordings.

Normalization

Audio Normalization

The process of adjusting audio volume to a target level without changing the dynamic range.

Nyquist Frequency

Half the sample rate, representing the highest frequency that can be accurately captured in digital audio.

PCM

Pulse-Code Modulation

The standard method of digitally representing analog audio signals by sampling amplitude at regular intervals.

Peak Level

Audio Peak Level

The highest instantaneous amplitude in an audio signal, used to prevent clipping and set headroom.

Pitch

Audio Pitch

The perceived frequency of a sound, determining how high or low a tone sounds to the listener.

Psychoacoustics

The study of how humans perceive sound, informing audio compression, spatial audio, and loudness standards.

Reverb

Reverberation

The persistence of sound in a space after the original sound stops, simulated digitally for spatial effects.

RMS Level

Root Mean Square Level

An average audio level measurement that better represents perceived loudness than peak level readings.

Sample Rate

Audio Sample Rate

The number of audio samples captured per second, measured in Hz (e.g. 44,100 Hz for CD quality).

Sidechain

Sidechain Processing

Using one audio signal to control the processing of another, commonly used to duck music under voiceover.

Spatial Audio

3D sound technology that positions audio sources in virtual space around the listener using HRTF and head tracking.

Spectrogram

Audio Spectrogram

A visual representation of audio frequencies over time, showing the spectrum of a signal.

Stereo

Stereophonic Audio

Audio using two independent channels (left and right) to create a sense of spatial width.

Stereo Imaging

Techniques for widening, narrowing, or repositioning the perceived stereo field of an audio mix.

Tempo

Audio Tempo

The speed or pace of an audio track, measured in beats per minute (BPM).

Waveform

Audio Waveform

A visual representation of an audio signal showing amplitude over time.