search query: @supervisor Välimäki, Vesa / total: 54
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| Author: | Vidal Wagner, Fernando |
| Title: | Automatic Calibration and Equalization of a Line Array System |
| Publication type: | Final Project work |
| Publication year: | 2015 |
| Pages: | 69 s. + liitt. 6 Language: eng |
| Department/School: | Sähkötekniikan korkeakoulu |
| Degree programme: | Tietoliikennetekniikan koulutusohjelma |
| Main subject: | Akustiikka ja äänenkäsittely (S-89) |
| Supervisor: | Välimäki, Vesa |
| Instructor: | Välimäki, Vesa |
| Electronic version URL: | http://urn.fi/URN:NBN:fi:aalto-201509184337 |
| Location: | P1 Ark Aalto 4520 | Archive |
| Keywords: | line array public adress crossover filtering delay adjustment graphic equalization automation |
| Abstract (eng): | This final project presents an automated Public Address processing unit, using delay and magnitude frequency response adjustment. The aim is to achieve a flat frequency response and delay adjustment between different physically-placed speakers at the measuring point, which is nowadays usually made manually by the sound technician. The adjustment is obtained using four signal processing operations to the audio signal: time delay adjustment, crossover filtering, gain adjustment, and graphic equalization. The automation is in the calculation of different parameter sets: estimation of the time delay, the selection of a suitable crossover frequency, and calculation of the gains for a third-octave graphic equalizer. These automatic methods reduce time and effort in the calibration of line-array PA systems, since only three sine sweeps must be played though the sound system. For verifying the functioning of the system, both simulated signals and measurements have been conducted. A 1:10 scale model of a line array system has been designed and constructed in an anechoic chamber to test the automatic calibration and equalization methods and the results are analyzed. |
| ED: | 2015-09-27 |
INSSI record number: 52030
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