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A new Audacity feature: room objective acustical parameters
It gives a measure of how much the environment increases (or decreases) the perceived loudness of a sound. A. Farina S. Campanini. New Audacity Feature. Page
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Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentA new Audacity feature: room objective acustical parameters calculation moduleAngelo Farina Simone Campanini
Università degli Studi di Parma - Facoltà di IngegneriaLinux Audio Conference, 2009
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentContents
1Why a port?
2ISO 3382 Acoustical Parameters
3TheAurorasuite4TheAudacityimplementation5In development
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentIntroduction
Some reasons for a port:
need for platform independent measuring toolsneed to go beyond the limits of a closed source main applicationA. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentThe First Attempt
Acoustical Parameters
is an independent module has a complex window!many functions can be reused for other modulesA. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentRoom Acoustic Project
Main targets:
Good listening for the audience.
Good feedback for the speakers or the
musicians.A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentSubjective vs. Objective
Listening is a subjective fact,
but can be a projectsubjective?A set of objective acoustical parameters is
needed!A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentSubjective vs. Objective
Listening is a subjective fact,
but can be a projectsubjective?A set of objective acoustical parameters is needed!A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentAcoustical Parameters
Many acoustical parameters has been tested in
the second half of 20 thcentury.An important set of them is collected in the
ISO 3382 standard.
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentA Room Fingerprint: The Impulse ResponseA. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentReverberation Time
T 60Time needed by the sound pressure to decrease by 60 dB from a steady level.
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentClarity And Definition Indexes
C te,Dte They are logarithmic ratios between a fraction and the entire (or the remaining) IR energy. t ecan be 50 ms or 80 ms: the first for speech, the latter for music.A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentSound Strenght
G It is a logarithmic ratio between the energy of the measured IR and a reference one.It gives a measure ofhow muchthe environment
increases (or decreases) the perceived loudness of a sound.A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentSpatial Indexes
LF;LFC;LG;IACC
They give a listener surround capabilities measure of the room. It is needed a more complex recording equipment:Omidirectional + Figure-of-eigth microphones (LF;LFC;LG).Binaural microphone (IACC).A. Farina, S. CampaniniNew Audacity FeatureWhy a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentStage Parameters
STEarly;STLate
They are logarithmic ratios between early or late energy and the early one (first 100 ms) of the IR.They are performer indexes
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentAurora: A Multipurpose Plugin Suite
Aurorais a toolkit for Adobe AuditionR
written byAngelo Farina.
It includes:ISO 3382 Acoustical Parameters calculator toolset for measurements with MLS technique toolset for measurements withSineSweeptechniquevarious convolution toolsSpeech Transmission Index (STI) calculator
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentThe Original Implementation
Since its first releaseAuroraiswritten in plain C code implemented as XFSCool Editplug-inavailable only on Windows platformsA. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentTheAcoustical Parametersmodule windowA. Farina, S. CampaniniNew Audacity FeatureWhy a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentThe Multiplatform Way: Compatibility IssuesWhyAudacity?It is a multiplatform application
It is a good quality software, with a growing
set of featuresIt is open-sourceA. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentThe Porting Process
Some steps has ben followed:
General code reordering
Conversion from C to C++
Conversion of GUI functions to wxWidgets
onesImplementation as externalAudacitylibrary (thanks toAudacitydevelopers group!)A. Farina, S. CampaniniNew Audacity FeatureWhy a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentAurora For Audacity: Setup Window
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentAurora For Audacity: Main Window
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentAurora For Audacity: Graphbar
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentComparison Of Results
A confrontation has been made with two
commercial software:Brüel & KjaerDiracversion 3.0Morset Sound DevelopmentWinMLS 2004 version 1.07A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentComparison Of Results -T20@ 250 HzAcoust. B&K WinMLSParam. Dirac 3.0 2004
EDT[s]4.82 4.76 4.74
T20[s]5.02 5.01 5.01
T30[s]4.98 4.96 4.97
C80[dB]- 4.40 -4.24 -4.8
D50[-]0.20 0.20 0.19
STE[dB]3.26 4.05 -
STL[dB]8.70 9.63 -
IACCE[-]0.34 - 0.31
A. Farina, S. CampaniniNew Audacity Feature
Why a port?
ISO 3382 Acoustical Parameters
TheAurorasuite
TheAudacityimplementation
In developmentComparison Of Results -T20@ 1 kHzAcoust. B&K WinMLSParam. Dirac 3.0 2004
EDT[s]4.44 4.41 4.38
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