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Audio Processing Algorithm Design

Audio processing tools, algorithm design and modularization, stream processing

Audio Toolbox™ is optimized for real-time audio stream processing. Use these features individually or as part of a larger algorithm to create effects, analyze signals, and process audio.


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designVarSlopeFilterDesign variable slope lowpass or highpass IIR filter
designParamEQDesign parametric equalizer
designShelvingEQDesign shelving equalizer
crossoverFilterAudio crossover filter
multibandParametricEQMultiband parametric equalizer
graphicEQStandards-based graphic equalizer
octaveFilterOctave-band and fractional octave-band filter
octaveFilterBankOctave and fractional-octave filter bank
weightingFilterFrequency-weighted filter
shelvingFilterSecond-order IIR shelving filter
gammatoneFilterBankGammatone filter bank
compressorDynamic range compressor
expanderDynamic range expander
limiterDynamic range limiter
noiseGateDynamic range gate
reverberatorAdd reverberation to audio signal
shiftPitchShift audio pitch
stretchAudioTime-stretch audio
audioTimeScalerApply time scaling to streaming audio
kbdwinKaiser-Bessel-derived window
mdctModified discrete cosine transform
imdctInverse modified discrete cosine transform


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CompressorDynamic range compressor
ExpanderDynamic range expander
LimiterDynamic range limiter
Noise GateDynamic range gate
ReverberatorAdd reverberation to audio signal
Crossover FilterAudio crossover filter
Weighting Filter Weighted frequency response filter
Octave FilterOctave-band and fractional octave-band filter
Octave Filter BankOctave-band and fractional octave-band filter bank
Single-Band Parametric EQSecond-order parametric equalizer filter
Graphic EQStandards-based graphic equalizer
Multiband Parametric EQMultiband parametric equalizer
Gammatone Filter BankGammatone filter bank
Shelving FilterSecond-order IIR shelving filter


  • Real-Time Audio in MATLAB

    Create a script to process and analyze real-time audio signals.

  • Real-Time Audio in Simulink

    Create a model using the Simulink® templates and blocks for audio processing.

  • Equalization

    Understand the foundations of audio equalization and how equalizers are implemented in Audio Toolbox.

  • Dynamic Range Control

    Understand the foundations of dynamic range control and how compressors, limiters, expanders, and noise gates are implemented in Audio Toolbox.

  • Parametric Equalizer Design

    Design parametric equalizer filters. Parametric equalizers are digital filters used in audio for adjusting the frequency content of a sound signal.