Glossário

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.

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

Taxa de Bits (Taxa de Dados)

A quantidade de dados processados por unidade de tempo em media digital, medida em bits por segundo (bps), que determina a qualidade e tamanho do ficheiro de audio e video.

Channel

Canal (Caminho de Sinal de Audio)

Um caminho de sinal de audio separado que transporta uma porcao distinta da mistura de audio, como esquerda, direita, centro, surround ou efeitos de baixa frequencia.

Chorus Effect

Audio Chorus Effect

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

Clipping

Clipping (Distorcao de Audio)

Um tipo de distorcao de audio que ocorre quando um sinal excede o nivel maximo que um sistema pode lidar, resultando em topo plano das formas de onda e som distorcido e aspero.

De-esser

Audio De-esser

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

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.

FLAC

Free Lossless Audio Codec

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

Loudness War

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

Pitch

Audio Pitch

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

Sample Rate

Taxa de Amostragem (Frequencia de Amostragem)

O numero de vezes por segundo que um sinal de audio e medido (amostrado) durante a gravacao digital, determinando a frequencia mais elevada que pode ser capturada com precisao.

Codec

Codec (Codificador-Descodificador)

Software ou hardware que comprime (codifica) e descomprime (descodifica) dados digitais de audio ou video, equilibrando qualidade, tamanho de ficheiro e velocidade de processamento.

Waveform

Forma de Onda (Representacao Visual de Audio)

Uma representacao visual de um sinal de audio que mostra a amplitude (volume) ao longo do tempo, permitindo aos utilizadores ver a estrutura, dinamica e tempo do conteudo de audio.

Equalization

Equalizacao (Ajuste de Equilibrio de Frequencias)

O processo de ajustar o equilibrio entre diferentes frequencias num sinal de audio, realcando ou reduzindo bandas de frequencia especificas para moldar o caracter tonal.

Noise Reduction

Reducao de Ruido (Limpeza de Audio)

O processo de reduzir ou eliminar sons indesejados de gravacoes de audio, incluindo ruido de fundo, zumbido, sibilancia e outros artefactos, preservando o sinal de audio desejado.

Fade

Fade (Transicao de Volume de Audio)

Um aumento ou diminuicao gradual do volume de audio ao longo do tempo, utilizado para criar transicoes suaves entre seccoes de audio, no inicio (fade in) ou final (fade out) de faixas.

Compression (Audio)

Dynamic Range Compression

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

PCM

Pulse-Code Modulation

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

Mono

Monaural Audio

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

Spectrogram

Audio Spectrogram

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

Tempo

Audio Tempo

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

Reverb

Reverberation

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

Limiter

Audio Limiter

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

Delay

Audio Delay Effect

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

Noise Gate

Audio Noise Gate

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

Sidechain

Sidechain Processing

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

LUFS

Loudness Units Full Scale

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

RMS Level

Root Mean Square Level

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

Peak Level

Audio Peak Level

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

Stereo Imaging

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

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.

Nyquist Frequency

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

Psychoacoustics

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

Crossfade

Audio Crossfade

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

Audio Watermark

Audio Watermarking

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

Spatial Audio

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

Normalization

Normalizacao (Ajuste de Nivel de Audio)

O processo de ajustar o volume global de uma gravacao de audio para atingir um nivel de volume alvo, garantindo niveis de audio consistentes entre diferentes faixas ou programas.

Mid-Side Processing

Mid-Side Audio Processing

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

Stereo

Stereophonic Audio

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