Naslov
Circular Correlation Method for the Sound Insulation Measurement

Autori
Mateljan, Ivo ; Ugrinović, Kosta

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the Seventh International Congress on Sound and Vibration / Guidati, Gianfranco ; Hunt, Hugh ; Heller, Hanno - Auburn (AL) : The International Institute of Acoustics and Vibration, 2000, 3305-3312

Skup
Seventh International Congress on Sound and Vibration

Mjesto i datum
Garmisch-Partenkirchen, Njemačka, 04.07.2000. - 07.07.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Sažetak
A method for the airborne sound insulation measurement is presented. The objectives are: fast sound level and reverberation time measurement, the reduction of stationary and random noise influence and a reduction of errors subjectively induced by measurement operators. The experimental measurement system consists of standard loudspeaker, microphone, digital generator of periodic uncorrelated multisine random-phase sequences and A/D receiver which is programmed to function as a correlation and Fourier analyzer of long periodic sequences. Filtering and averaging is performed in the frequency domain. The reverberation time estimation is done by postprocessing the correlation estimated wideband impulse response. The sound reduction index is estimated by postprocessing loudspeaker in-room steady state frequency response. Under a low noise condition the system estimates sound reduction index in all standard frequency bands in a few seconds, without need for the signal averaging. For the reduction of a higher noise level, the complex frequency domain averaging can be applied. It gives high noise reduction efficiency, as aliasing and biasing errors are minimized by using periodic deterministic generator sequences.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika

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