A UserFriendly Graphical System for Room Acoustics Measurement

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A User-Friendly Graphical System for Room Acoustics Measurement and Analysis Leo Ueda, Fábio Figueiredo,

A User-Friendly Graphical System for Room Acoustics Measurement and Analysis Leo Ueda, Fábio Figueiredo, Fernando Iazzetta, Fabio Kon http: //gsd. ime. usp. br/acmus Department of Computer Science Department of Music University of São Paulo, Brazil 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Outline • Introduction – Ac. Mus project • Measurement Prototype – MATLAB • Ac.

Outline • Introduction – Ac. Mus project • Measurement Prototype – MATLAB • Ac. Mus Integrated Platform – Eclipse (Java) • Conclusion 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Ac. Mus Project • Started in 2001 as a research group at USP •

Ac. Mus Project • Started in 2001 as a research group at USP • Gathers researchers from different fields (Music, Architecture, Engineering, Physics, and Computer Science) • Main goals: – Study of issues related to estimation, measurement, analysis, and simulation of music rooms – Development of a computer software (the Ac. Mus Integrated Platform) 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

The Software • Environment that integrates different tools for acoustic analysis, simulation, and optimization

The Software • Environment that integrates different tools for acoustic analysis, simulation, and optimization • Open-source, platform-independent • 3 modules: – Measurement – Audio and Acoustic Utilities – Simulation and Optimization 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Measurements • Signal → room response → impulse response → acoustical parameters • Generates

Measurements • Signal → room response → impulse response → acoustical parameters • Generates a large amount of data • We measured 6 concert rooms in São Paulo in order to study subjective parameters related to musical quality 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Measurement Module Prototype • Set of MATLAB functions • Provides the MLS and LSF

Measurement Module Prototype • Set of MATLAB functions • Provides the MLS and LSF methods for acquiring the room impulse response • Calculates a number of acoustical parameters from the impulse response • No special user interface • Used to process actual measurements 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Ac. Mus Integrated Platform • Final implementation of the Ac. Mus Software • A

Ac. Mus Integrated Platform • Final implementation of the Ac. Mus Software • A single computer environment for the 3 modules • Based on the Eclipse Platform and Java • Current work: implementation of the Measurement Module • Important goal: provide an efficient and easy-to-use user interface 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Measurement Module • Hierarchical folders help the user to organize measurements taken from different

Measurement Module • Hierarchical folders help the user to organize measurements taken from different rooms 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Folders • Project: represents a room • Session: groups measurements taken at a specific

Folders • Project: represents a room • Session: groups measurements taken at a specific period in time • Set: stores repetitions of the same measurement. • Measurement: stores the audio file of the room’s response and the output of the response analysis 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Folders 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de

Folders 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Other features • Wizards for the creation of each kind of folder • Keeps

Other features • Wizards for the creation of each kind of folder • Keeps additional information about folders (date, time, equipment, comments, etc. ) • Signal generator • Position documentation 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Position Editor 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro

Position Editor 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Measurement Interface • User chooses the signal to be played • Software plays the

Measurement Interface • User chooses the signal to be played • Software plays the signal and records the room response • Software then calculates the impulse response and the acoustical parameters 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Recording 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de

Recording 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Impulse Response 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro

Impulse Response 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Parameters 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de

Parameters 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Work on the field • Using our prototype, we measured 6 concert rooms in

Work on the field • Using our prototype, we measured 6 concert rooms in São Paulo where stable symphonic groups perform regularly: – Anfiteatro Camargo Guarnieri – Teatro de Diadema – Teatro do Memorial da América Latina – Teatro Municipal – Teatro São Pedro – Teatro Sérgio Cardoso 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Reverberation Time on Stage 10 o Simpósio Brasileiro de Computação Musical 3 a 6

Reverberation Time on Stage 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Clarity – Teatro Municipal 10 o Simpósio Brasileiro de Computação Musical 3 a 6

Clarity – Teatro Municipal 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Ongoing and Future Work • Performance: implement some of the DSP functions in C/C++?

Ongoing and Future Work • Performance: implement some of the DSP functions in C/C++? • Measurement Module user interface enhancements – Data visualization – Tasks in batch mode • Work on the Simulation and Optimization Module 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Conclusions • Ac. Mus currently offers the main calculations and processing tools • It

Conclusions • Ac. Mus currently offers the main calculations and processing tools • It is freely available and open source • We welcome collaborators and users from other groups Ac. Mus website: http: //gsd. ime. usp. br/acmus 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

Ac. Mus website: http: //gsd. ime. usp. br/acmus 10 o Simpósio Brasileiro de Computação

Ac. Mus website: http: //gsd. ime. usp. br/acmus 10 o Simpósio Brasileiro de Computação Musical 3 a 6 de Outubro de 2005

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