Psychoacoustics

Perceptual metrics and sound quality evaluation

Audio Toolbox™ provides features relating to psychoacoustics, which is the study of how humans perceive sound. Use these features to measure perceptual properties of sound, such as loudness, tonality, quality, and intelligibility.

Functions

expand all

Metrics

`integratedLoudness`	Measure integrated loudness and loudness range
`loudnessMeter`	Standard-compliant loudness measurements
`stoi`	Short-time objective intelligibility measure (Since R2024a)
`visqol`	Objective metric for perceived audio quality (Since R2024a)
`acousticToneToNoiseRatio`	Identify and quantify tones in acoustic signals (Since R2023b)
`acousticProminenceRatio`	Quantify tonality by comparing critical bands (Since R2023b)
`acousticLoudness`	Perceived loudness of acoustic signal (Since R2020a)
`acousticSharpness`	Perceived sharpness of acoustic signal (Since R2020a)
`acousticFluctuation`	Perceived fluctuation strength of acoustic signal (Since R2020b)
`acousticRoughness`	Perceived roughness of acoustic signal (Since R2021a)
`calibrateMicrophone`	Calibration factor for microphone (Since R2020a)

Domain Conversion

`erb2hz`	Convert from equivalent rectangular bandwidth (ERB) scale to hertz
`bark2hz`	Convert from Bark scale to hertz
`mel2hz`	Convert from mel scale to hertz
`hz2erb`	Convert from hertz to equivalent rectangular bandwidth (ERB) scale
`hz2bark`	Convert from hertz to Bark scale
`hz2mel`	Convert from hertz to mel scale
`phon2sone`	Convert from phon to sone (Since R2020a)
`sone2phon`	Convert from sone to phon (Since R2020a)

Blocks

Loudness Meter

Standard-compliant loudness measurements

Topics

Measuring Speech Intelligibility and Perceived Audio Quality with STOI and ViSQOL
Use the STOI and ViSQOL metrics to measure speech intelligibility and perceptual audio quality in speech and audio signals.

Featured Examples

Effect of Soundproofing on Perceived Noise Levels

Measure engine noise and use psychoacoustic metrics to model its perceived loudness, sharpness, fluctuation strength, roughness, and overall annoyance level.

Open Live Script

Loudness Normalization in Accordance with EBU R 128 Standard

Use tools from Audio Toolbox to measure loudness, loudness range, and true-peak value.

Open Live Script

Psychoacoustic Bass Enhancement for Band-Limited Signals

An audio plugin designed to enhance the perceived sound level in the lower part of the audible spectrum.

Open Live Script

THD+N Measurement with Tone-Tracking

Measure total harmonic distortion and noise level of audio input and output devices.

Open Model