measurements and spatial audio -凯发k8网页登录

acoustics, psychoacoustics, room impulse response, hrtf, spl metering

audio toolbox™ enables you to measure acoustics, encode and decode ambisonics, interpolate head-related transfer functions (hrtf) and return industry-standard audio measurements.

apps

measure impulse response of audio system

functions

filters

	octave-band and fractional octave-band filter
	octave and fractional-octave filter bank
	frequency-weighted filter

head-related transfer function

3-d head-related transfer function (hrtf) interpolation

impulse response estimation

	estimate impulse response of audio system
	maximum length sequence
	exponential swept sine

loudness

	standard-compliant loudness measurements
	measure integrated loudness and loudness range
	perceived loudness of acoustic signal
	perceived sharpness of acoustic signal
	perceived fluctuation strength of acoustic signal
	perceived roughness of acoustic signal
	calibration factor for microphone

meters and measurements

	measure sound pressure level of audio signal
	measure digital audio peak level

domain conversion

	convert from equivalent rectangular bandwidth (erb) scale to hertz
	convert from bark scale to hertz
	convert from mel scale to hertz
	convert from hertz to equivalent rectangular bandwidth (erb) scale
	convert from hertz to bark scale
	convert from hertz to mel scale
	convert from phon to sone
	convert from sone to phon

blocks

	standard-compliant loudness measurements
	weighted frequency response filter
	octave-band and fractional octave-band filter
	octave-band and fractional octave-band filter bank

topics

measure and manage impulse responses
capture and analyze impulse response (ir) measurements by using the impulse response measurer.
this example shows how to generate a stereo signal from a multichannel audio signal using matrix encoding, and how to recover the original channels from the stereo mix using matrix decoding.

related information

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.

sound pressure measurement of octave frequency bands

demonstrates how to measure sound pressure levels of octave frequency bands. a user interface (ui) enables you to experiment with various parameters while the measurement is displayed.

active noise control with simulink real-time

design a real-time active noise control system using a speedgoat® simulink® real-time™ target.

ambisonic plugin generation

this examples shows how to create ambisonic plugins using matlab® higher order ambisonic (hoa) demo functions. ambisonics is a spatial audio technique which represents a three-dimensional sound field using spherical harmonics. this example contains an encoder plugin, a function to generate custom encoder plugins, a decoder plugin, and a function to generate custom decoder plugins. the customization of plugin generation enables a user to specify various ambisonic orders and various device lists for a given ambisonic configuration.

ambisonic binaural decoding

decode ambisonic audio into binaural audio using virtual loudspeakers. a virtual loudspeaker is a sound source positioned on the surface of a sphere, with the listener located at the center of the sphere. each virtual loudspeaker has a pair of head-related transfer functions (hrtf) associated with it: one for the left ear and one for the right ear. the virtual loudspeaker locations along with the ambisonic order are used to calculate the ambisonic decoder matrix. the output of the decoder is filtered by the hrtfs corresponding to the virtual loudspeaker position. the signals from the left hrtfs are summed together and fed to the left ear. the signals from the right hrtfs are summed together and fed to the right ear. a block diagram of the audio signal flow is shown here.

binaural audio rendering using head tracking

track head orientation by fusing data received from an imu, and then control the direction of arrival of a sound source by applying head-related transfer functions (hrtf).

measure impulse response of an audio system

the impulse response (ir) is an important tool for characterizing or representing a linear time-invariant (lti) system. the impulseresponsemeasurer enables you to measure and capture the impulse response of audio systems, including:

thd n measurement with tone-tracking

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