Main Content

Measurements and Spatial Audio

Acoustics, impulse responses, and ambisonics

Audio Toolbox™ enables you to perform measurements on audio systems using functionality to generate test excitation signals, estimate impulse responses, and calculate industry-standard metrics.

You can also use Audio Toolbox features to work with spatial audio signals. Read head-related transfer functions (HRTFs) stored in SOFA files, and interpolate HRTFs with interpolateHRTF. Synthesize room impulse responses for virtual indoor spaces with acousticRoomResponse. Use ambisonicEncoderMatrix and ambisonicDecoderMatrix to encode and decode 3-D audio using ambisonics.

Apps

Impulse Response MeasurerMeasure impulse response of audio system

Functions

expand all

ambisonicEncoderMatrixGenerate matrix for ambisonics encoding (Since R2025a)
ambisonicDecoderMatrixGenerate matrix for ambisonics decoding (Since R2025a)
interpolateHRTF3-D head-related transfer function (HRTF) interpolation
sofareadRead SOFA files (Since R2023b)
sofawriteWrite SOFA files (Since R2023b)
sofaconventionCreate SOFA convention (Since R2023b)
SimpleFreeFieldHRIRSimpleFreeFieldHRIR SOFA convention (Since R2023b)
SimpleFreeFieldHRSOSSimpleFreeFieldHRSOS SOFA convention (Since R2023b)
SimpleFreeFieldHRTFSimpleFreeFieldHRTF SOFA convention (Since R2023b)
GeneralFIRGeneralFIR SOFA convention (Since R2023b)
GeneralSOSGeneralSOS SOFA convention (Since R2023b)
GeneralTFGeneralTF SOFA convention (Since R2023b)
GeneralTFEGeneralTF-E SOFA convention (Since R2023b)
GeneralFIREGeneralFIR-E SOFA convention (Since R2023b)
FreeFieldHRIRFreeFieldHRIR SOFA convention (Since R2023b)
FreeFieldHRTFFreeFieldHRTF SOFA convention (Since R2023b)
SimpleHeadphoneIRSimpleHeadphoneIR SOFA convention (Since R2023b)
SingleRoomSRIRSingleRoomSRIR SOFA convention (Since R2023b)
SingleRoomMIMOSRIRSingleRoomMIMOSRIR SOFA convention (Since R2023b)
FreeFieldDirectivityTFFreeFieldDirectivityTF SOFA convention (Since R2023b)
acousticRoomResponseSynthesize room impulse response (Since R2025a)
impzestEstimate impulse response of audio system
mlsMaximum length sequence
sweeptoneExponential swept sine
multitoneGenerate sparse multitone signal (Since R2025a)
loudnessMeterStandard-compliant loudness measurements
audioLevelMeterMeasure digital audio peak level (Since R2023a)
splMeterMeasure sound pressure level of audio signal
calibrateMicrophoneCalibration factor for microphone
sisnrScale-invariant signal-to-noise ratio (Since R2024b)
permutationInvariantSISNRPermutation invariant SI-SNR (Since R2024b)
octaveSpectrumEstimatorCompute octave-band spectrum (Since R2024b)
rt60Estimate decay time of room impulse response (Since R2025a)
uiaudiometerCreate an audio meter component (Since R2023b)

Properties

Meter PropertiesAudio Meter UI component (Since R2023b)

Blocks

Loudness MeterStandard-compliant loudness measurements

Topics

Featured Examples